| 1 | A SCR is a ___ |
| 2 | With gate open, a SCR can be turned-on by ___ |
| 3 | A conducting SCR can be opened by ___ |
| 4 | If gate current is increased, the anode-cathode voltage at ___ |
| 5 | The normal way to close a SCR is by ___ |
| 6 | In a SCR circuit, the angle of conduction can be ___ |
| 7 | The SCR is turned-off when the ___ |
| 8 | For thyristors, pulse triggering is preferred to ___ |
| 9 | Which of the following conditions is necessary for triggering system for thyristors? |
| 10 | On state voltage drop across thyristor used in a 230 V supply system is ___ |
| 11 | Once SCR starts conducting a forward current, its ___ |
| 12 | In a thyristor, ratio of latching current to holding current is ___ |
| 13 | In a thyristor, the magnitude of the anode current will ___ |
| 14 | A forward voltage can be applied to an ___ |
| 15 | During forward blocking state, a thyristor is ___ |
| 16 | A thyristor can be termed as ___ |
| 17 | When a thyristor turn on, the ___ |
| 18 | In thyristor, holding current is ___ |
| 19 | The turn-on time of a SCR with inductive load is ___ |
| 20 | When the SCR conducts, the forward ___ |
| 21 | A positive voltage is applied to the gate of ___ |
| 22 | Thermal runaway of a thyristor occurs because ___ |
| 23 | The di/dt capability of a thyristor ___ |
| 24 | Turn-off time of a thyristor effects its ___ |
| 25 | The turn-off time of thyristor is ___ |
| 26 | A cycloconverter is ___ |
| 27 | The rated current of a thyristor is ___ |
| 28 | In an SCR, the anode current is ___ |
| 29 | A 3 phase bridge inverter is fed by ___ |
| 30 | Current chopping leads to ___ |
| 31 | Most SCRs can be turned-off by voltage reversal during ___ |
| 32 | An SCR does not conduct for a certain value of ___ |
| 33 | In a thyristor, the magnitude of the ___ |
| 34 | In the circuit given below, the function of ___ |
| 35 | Surge current rating of an SCR specifies ___ |
| 36 | Specification sheet for an SCR gives its ___ |
| 37 | Turn-on time of an SCR can be reduced by ___ |
| 38 | Turn-on time of an SCR in series with RL circuit can be ___ |
| 39 | For an SCR, with turn-on time of 5 μsec, an ___ |
| 40 | A forward voltage can be applied to ___ |
| 41 | Turn-off time of an SCR is measured from ___ |
| 42 | Turn-on time for an SCR is ___ |
| 43 | In an SCR, anode current flows over a narrow region near the ___ |
| 44 | Gate characteristics of ___ |
| 45 | On-state voltage drop across a thyristor used in a 250 V supply system is ___ |
| 46 | The forward voltage drop during SCR-on state is ___ |
| 47 | When a thyristor gets turned ON, the ___ |
| 48 | In a thyristor, anode current is ___ |
| 49 | A single phase full bridge inverter ___ |
| 50 | A single phase full bridge inverter has RLC load ___ |
| 51 | A single phase full bridge inverter has RLC load with ___ |
| 52 | A single phase full bridge inverter has RLC ___ |
| 53 | For a full bridge inverter with the following ___ |
| 54 | A single phase full bridge inverter is fed from a dc source such that ___ |
| 55 | A single phase full bridge inverter circuit, has ___ |
| 56 | In a half wave circuit, forced commutation is essential when ___ |
| 57 | In a half wave bridge inverter circuit, the power delivered to the load by ___ |
| 58 | A certain full bridge type inverter circuit has its rms value of ___ |
| 59 | A single phase full bridge inverter has ___ |
| 60 | A single phase full bridge inverter has a ___ |
| 61 | A single phase half bridge inverter has load ___ |
| 62 | A single phase half bridge inverter has a dc voltage source ___ |
| 63 | The fundamental component of output voltage for a full wave bridge inverter is ___ |
| 64 | The fundamental component of output voltage for a half wave bridge inverter is ___ |
| 65 | For a half wave bridge inverter, the output voltage ___ |
| 66 | For a full wave bridge inverter, the output voltage ___ |
| 67 | In current commutated copper circuit ___ |
| 68 | A current commutated chopper is fed from a source of ____ |
| 69 | A voltage commutated chopper has the ___ |
| 70 | A voltage commutated chopper has the following ___ |
| 71 | The load commutated chopper circuit consists of ___ |
| 72 | In the below given circuit, when the main SCR ___ |
| 73 | In a voltage commutated SCR, the main SCR is ___ |
| 74 | Which type of commutation circuit does not work on no load? |
| 75 | What is the expression for the value of the capacitor in the voltage commutation circuit? |
| 76 | The time constant of a series RC circuit is ___ |
| 77 | A circuit is so formed such that the source-R-C-diode-switch are ___ |
| 78 | A diode circuit is so arranged that when the switch is ___ |
| 79 | An ideal diode has ___ |
| 80 | GTOs have ___ |
| 81 | In case of the two-transistor model ___ |
| 82 | Latching current for the GTOs is ___ |
| 83 | Gold doped GTOs have ___ |
| 84 | A GTO can be represented by ___ |
| 85 | The turn-off gain ___ |
| 86 | In the below shown voltage commutated chopper circuit, the chopper operation ___ |
| 87 | The single-phase McMurray-Bedford type bridge inverter is ___ |
| 88 | The McMurray-Bedford half-bridge inverter requires ____ |
| 89 | How many diodes are there in total in the single-phase, modified McMurray full-bridge inverter? |
| 90 | In the single-phase modified McMurray full-bridge inverter, for commutating the ___ |
| 91 | The number of diodes, SCRs and other components in ___ |
| 92 | UJT can be used for ___ |
| 93 | The gate current of an SCR is always in the form of ___ |
| 94 | If ton and toff are the turn on and turn off times of a ___ |
| 95 | The number of leads in a power semiconductor diode are ___ |
| 96 | A dual converter may be circulating current type or ___ |
| 97 | In a 3 phase full wave regulator feeding resistance load connected in ___ |
| 98 | A single phase half wave converter is feeding a ___ |
| 99 | In integral cycle control the period of on-off control should be ___ |
| 100 | Two semiconverters are connected in series to ___ |
| 101 | A thyristor needs protection against ___ |
| 102 | Which of these commutation methods uses an auxiliary SCR? |
| 103 | A reactor is used in a dual converter operating in non-circulating current mode |
| 104 | In a single phase full wave ac regulator the rms value of load current is ___ |
| 105 | In 180° mode of operation of a 3 phase ___ |
| 106 | All inverters use forced commutation |
| 107 | The number of doped regions in a SCR is ___ |
| 108 | In a single phase full wave converter (M-2 connection), the rms ___ |
| 109 | An inverter does not require forced commutation ___ |
| 110 | A 750 A circuit uses thyristor of ___ |
| 111 | An SBS can conduct is one direction only |
| 112 | A single phase series converter is ___ |
| 113 | A thyristor is reverse biased ___ |
| 114 | In a 3 phase full wave regulator feeding a ___ |
| 115 | A dc chopper is feeding ___ |
| 116 | Let Im be the maximum load current and Vm be the ___ |
| 117 | Which elements are not present in the original McMurray inverter but are ___ |
| 118 | Forced commutation requires ___ |
| 119 | The McMurray circuit is a ___ |
| 120 | In voltage fed thyristor inverters ___ commutation is required |
| 121 | If a step up chopper”s switch is always kept open then ___ |
| 122 | If a step up chopper”s switch is always kept off then ___ |
| 123 | Find the output voltage for a step-up chopper when it is operated at ___ |
| 124 | A three-phase full converter is driving ___ |
| 125 | A three-phase full converter supplied from a 230 V source is ___ |
| 126 | A three-phase full converter charges a ___ |
| 127 | A three-phase full converter charges a battery from ___ |
| 128 | A three-phase full converter charges a battery from a three-phase supply of ___ |
| 129 | For a three-phase full controlled converter with R load, the average value of ___ |
| 130 | For the below given circuit, the conduction sequence for the ___ |
| 131 | In case of a three phase full controlled converter with ___ |
| 132 | For a three phase full controlled converter, with 3 thyristors in the upper or ___ |
| 133 | For the below given circuit, α = ___ |
| 134 | A three phase six pulse full converter works as ___ |
| 135 | A three phase full converter will require ___ |
| 136 | A three-phase half-wave controlled converter is fed ___ |
| 137 | A three-phase M-3 converter is operated from a ___ |
| 138 | A three-phase three-pulse converter would operate as ___ |
| 139 | A three-phase three pulse type controlled converter is ___ |
| 140 | Find the expression for average output voltage at R for the below ___ |
| 141 | The SITH (Static Induction Thyristor) is ___ |
| 142 | The TRIAC can be represented by ___ |
| 143 | The DIAC can be represented by ___ |
| 144 | Which of the following devices provide complete isolation between ___ |
| 145 | The SCS (Silicon Controlled Switch) can be turned on by ___ |
| 146 | The SCS is a four layer, four terminal ___ |
| 147 | The SCS (Silicon Controlled Switch) is ___ |
| 148 | From the following list of devices, choose the device that only turns-on for ___ |
| 149 | The equivalent circuit of SUS (Silicon Unilateral Switch) consists of ___ |
| 150 | The Programmable Unijunction Transistor (PUT) turns on & starts conducting ___ |
| 151 | The body of an IGBT consists of ___ |
| 152 | An IGBT is also know as ___ |
| 153 | The approximate equivalent circuit of ___ |
| 154 | Choose the correct statement |
| 155 | In an IGBT, during the turn-on time ___ |
| 156 | Latch-up occurs in an IGBT when ___ |
| 157 | The static V-I curve of an IGBT is ___ |
| 158 | A latched up IGBT can be ___ |
| 159 | When latch-up occurs in ___ |
| 160 | The major drawback of the first generation IGBTs was ___ |
| 161 | The structure of the IGBT is ___ |
| 162 | The controlled parameter in IGBT is ___ |
| 163 | The voltage blocking capability of the IGBT is ___ |
| 164 | In IGBT, the n– layer above the p+ layer is called as ___ |
| 165 | The controlling parameter in IGBT is ___ |
| 166 | In IGBT, the p+ layer connected to the collector terminal is ___ |
| 167 | The three terminals of the ___ |
| 168 | IGBT & BJT both posses ___ |
| 169 | IGBT possess ___ |
| 170 | The output characteristics of a MOSFET, is ___ |
| 171 | In the transfer characteristics of a MOSFET, the threshold voltage is ___ |
| 172 | In the internal structure of a MOSFET, a parasitic BJT exists ___ |
| 173 | The controlling parameter in ___ |
| 174 | The arrow on the symbol of MOSFET indicates ___ |
| 175 | Choose the following correct statement ___ |
| 176 | Choose the correct statement(s) ___ |
| 177 | Choose the correct statement from the following : |
| 178 | Which of the following terminals does not belong to the MOSFET? |
| 179 | The MOSFET combines the areas of ___ |
| 180 | For a power transistor, the average power loss during the ___ |
| 181 | The instantaneous power loss during the delay time of ___ |
| 182 | High frequency operation of any device is ___ |
| 183 | For a power transistor, which of the following relations is true? |
| 184 | The power electronics devices have a ___ |
| 185 | For a power transistor, if the forward current gain α = 0.97, then___ |
| 186 | A power BJT is used as a power control switch by ___ |
| 187 | The forward current gain α is ___ |
| 188 | For a power transistor, if the base current ___ |
| 189 | In a power transistor, the ___ |
| 190 | In a power transistor, ___ is the controlling parameter |
| 191 | In a power transistor, ___ is the controlled parameter |
| 192 | A power transistor is a ___ |
| 193 | Which of the following devices does not belong to the transistor family? |
| 194 | Zener diodes allow a current to flow in the ___ |
| 195 | An inverter capable of supplying a balanced three-phase variable ___ |
| 196 | The speed and torque of induction motors can be varied by which of the following means? |
| 197 | Voltage induced in the rotor of the induction motor when it ___ |
| 198 | Speed control of induction motor can be ___ |
| 199 | A single-phase voltage controller feeds an induction motor and ___ |
| 200 | In an a.c. motor control, the ratio of voltage to frequency is ___ |
| 201 | The advantage of tachometer speed control method for ___ |
| 202 | A dc chopper circuit controls the average voltage across the ___ |
| 203 | A motor armature supplied through phase-controlled SCRs receives ___ |
| 204 | For controlling the speed of dc motor of 150 hp rating, the following ___ |
| 205 | The speed of a dc shunt motor above normal speed can be ___ |
| 206 | Armature voltage of a dc motor can be ___ |
| 207 | A step down chopper operates from ___ |
| 208 | The advantage of the tachometer speed control method for ___ |
| 209 | In case of armature controlled separately excited dc motor drive with ___ |
| 210 | A thyristorised three-phase, fully controlled converter feeds a ___ |
| 211 | A three-phase semiconverter feeds the armature of a ___ |
| 212 | It is required to drive a d.c. shunt motor at different speeds in ___ |
| 213 | Chopper control for DC motor provides variation in ___ |
| 214 | In a dc motor, if the field coils get opened, the speed of ___ |
| 215 | An SCR is used to control the speed of ___ |
| 216 | A motor armature supplied through phase controlled SCR receives ___ |
| 217 | The object of connecting resistance and capacitance across gate circuit is ___ |
| 218 | Surge current rating of thyristor specifies ___ |
| 219 | Heat sink is a mass of metal that is added to a device for the purpose of ___ |
| 220 | Overvoltages may be ___ |
| 221 | Suppressor is a device that responds to the rate of change of ___ |
| 222 | Gate can be protected against overvoltage by ___ |
| 223 | Gate can be protected against overcurrent by ___ |
| 224 | Gates are protected against spurious (or noise) firing by ___ |
| 225 | As soon as fault current is defected, it can be shunted away by ___ |
| 226 | The scheme which can be implemented if ___ |
| 227 | Device used for current protection is ___ |
| 228 | The thermal resistance between the body of ___ |
| 229 | A thyrite resistor is ___ |
| 230 | For an SCR, dv/dt protection is achieved through the ___ |
| 231 | For an SCR, di/dt protection is achieved through the ___ |
| 232 | Which of the following does not cause permanent damage of an SCR? |
| 233 | The maximum di/dt in an SCR is ___ |
| 234 | Snubber circuit is used to limit the ___ |
| 235 | The anode current through a conducting SCR is ___ |
| 236 | The metal oxide varistor (MOV) is used for ___ |
| 237 | The ZCS buck converter has ___ |
| 238 | Class E resonant inverter operates at ___ |
| 239 | Full-bridge series resonant inverter with bidirectional switches has ___ |
| 240 | Half-bridge series resonant inverter with bidirectional switches is ___ |
| 241 | The basic series resonant inverter with bidirectional switches has ___ |
| 242 | The half-bridge series resonant inverter is operated at ___ |
| 243 | Parallel-resonant inverters are ___ |
| 244 | Resonant inverters are used in ___ |
| 245 | Zero-current switching requires ___ |
| 246 | As a filter, series RLC combination provides ___ |
| 247 | Zero voltage and zero current ___ |
| 248 | Class E resonant converters are ___ |
| 249 | In series resonant converters, the output is ___ |
| 250 | Resonant converters are basically used to ___ |
| 251 | A series R-L-C circuit when excited by a 10 V sinusoidal voltage source of ___ |
| 252 | A single-phase half-wave ac voltage regulator using ___ |
| 253 | The conduction angle (δ) of ___ |
| 254 | In a single phase full-wave ac regulator, varying the ___ |
| 255 | Sequence control of AC regulators is ___ |
| 256 | AC voltage regulators converters converts ___ |
| 257 | In a 3-pulse cycloconverter with intergroup reactor operating in ___ |
| 258 | A cycloconverters can be considered to be ___ |
| 259 | A 3-pulse cycloconverter feeding a single-phase load of ___ |
| 260 | A six-pulse cycloconverter is fed from ___ |
| 261 | Cycloconverter converts ___ |
| 262 | Triangular PWM control when applied to ___ |
| 263 | In sinusoidal PWM, there are “m” cycles of ___ |
| 264 | A single-phase CSI has ___ |
| 265 | In an inverter with fundamental output frequency of ___ |
| 266 | In a constant source inverter, if frequency of output voltage is ___ |
| 267 | Which of the following statements is correct in ___ |
| 268 | In sinusoidal-pulse modulation, used in PWM inverters amplitude and ___ |
| 269 | In multiple-pulse modulation used in PWM inverters, the amplitudes of ___ |
| 270 | A voltage source inverter is normally employed when ___ |
| 271 | In single-pulse modulation of PWM inverters, the pulse width is ___ |
| 272 | In single-pulse modulation of PWM inverters fifth harmonic can be ___ |
| 273 | The single pulse modulation of PWM inverters, third harmonic can be ___ |
| 274 | A single phase bridge inverter delivers power to ___ |
| 275 | A single phase full-bridge inverter can operate in ___ |
| 276 | In voltage source inverters ___ |
| 277 | If, for a single phase half-bridge inverter, the amplitude of output voltage is ___ |
| 278 | The switching frequency of firing the six SCRs should be ___ |
| 279 | The number of SCRs conducting at a time in ___ |
| 280 | In the figure, the function tap switching firing sequence of ___ |
| 281 | In the SCR tap-switch inverter, when ___ |
| 282 | A chopper is a high efficiency circuit |
| 283 | A cycloconverter for single phase operation has ___ |
| 284 | A single phase half wave rectifier is ___ |
| 285 | Which of these commutation methods uses two leads? |
| 286 | A dc chopper is feeding an RLE ___ |
| 287 | In a single phase semi-converter the number of ___ |
| 288 | In a semi converter feeding a ___ |
| 289 | In a single phase full wave ac regulator feeding R-L load, the ___ |
| 290 | When a dc chopper feeds an RLE load, the load current, during ___ |
| 291 | Typical values of for an SCR are in the range of ___ |
| 292 | A single phase half bridge inverter required to ___ |
| 293 | The circuit in figure is ___ |
| 294 | The turn on characteristics of a power transistor can be assumed to be ___ |
| 295 | The symbol in the figure is for ___ |
| 296 | In a 3 phase full wave regulator feeding a star connected ___ |
| 297 | In a single phase full wave ac regulator the firing angles during ___ |
| 298 | The main utility of SCR is ___ |
| 299 | A 3 phase bridge inverter is ___ |
| 300 | In a 3 phase full converter feeding a highly inductive ___ |
| 301 | In a single phase half wave converter feeding resistive load and ___ |
| 302 | A fully controlled bridge converter is feeding an ___ |
| 303 | The circuit in figure is for ___ |
| 304 | In a single phase full wave ac regulator using ___ |
| 305 | In a 3 phase full converter, the instantaneous output voltage can ___ |
| 306 | A DIAC has four layers but only two ___ |
| 307 | Mc Murray full bridge inverter uses ___ |
| 308 | The output frequency of a cycloconverter can be ___ |
| 309 | If the frequency is less than the damped frequency in ___ |
| 310 | The efficiency of a chopper circuit is ___ |
| 311 | The symbol in the figure is ___ |
| 312 | A class D chopper ___ |
| 313 | In sinusoidal PWM for inverters the width of different pulses are not the same |
| 314 | When an SCR is in forward blocking mode, the applied ___ |
| 315 | Which inverter circuit uses coupled inductors? |
| 316 | A 3 phase dual converter consists of ___ |
| 317 | A half wave controlled rectifier has poorer efficiency and ___ |
| 318 | Which of these devices can conduct in both directions? |
| 319 | The total number of leads in SUS, SBS and SCS respectively are ___ |
| 320 | The minimum gate current which can turn on SCR is ___ |
| 321 | A surge voltage ___ |
| 322 | A string of series connected thyristors needs ___ |
| 323 | In thermal ohm’s law, temperature and power loss are ___ |
| 324 | When a power diode is conducting, the voltage drop across ___ |
| 325 | In a series inverter ___ |
| 326 | A dc chopper is feeding an ___ |
| 327 | In a single phase full wave converter (M-2 connection) feeding ___ |
| 328 | Which of the following devices has metal-silicon junction? |
| 329 | Surge current rating of an ___ |
| 330 | HVDC systems are preferable for ___ |
| 331 | The diodes in a voltage source inverter ___ |
| 332 | A three-phase voltage source inverter supplies a ___ |
| 333 | A single-phase full-bridge voltage-source inverter feels a ___ |
| 334 | The figure shows an inverter circuit with a ___ |
| 335 | A PWM switching scheme is used with ___ |
| 336 | Inverter gain is given by ___ |
| 337 | A single phase voltage-source-square wave inverter feeds ___ |
| 338 | In dc chopper, the load voltage is ___ |
| 339 | Chopper controlled dc motor used in underground traction with ___ |
| 340 | Which of the following systems has a greater possibility of interference with signalling and telephone lines? |
| 341 | Which of the following system is preferred for chopper drives? |
| 342 | Choppers can be used in ___ |
| 343 | The features of chopper drives are ___ |
| 344 | When polyphase choppers are ___ |
| 345 | A step-down chopper is operated in the ___ |
| 346 | A dc chopper is fed from ___ |
| 347 | A dc battery is charged from a constant dc source of ___ |
| 348 | A load commutated chopper, fed from ___ |
| 349 | In PWM method of controlling the average output voltage in ___ |
| 350 | In a type-A chopper, source voltage is ___ |
| 351 | A voltage commutated chopper has ___ |
| 352 | A dc to dc transistor chopper supplied from a fixed voltage dc source feeds a ___ |
| 353 | In a thyristor dc chopper, which type of commutation results in best performance? |
| 354 | If the chopper frequency is ___ |
| 355 | For type A chopper ___ |
| 356 | In dc choppers, for periodic time T, the output voltage can be ___ |
| 357 | In dc choppers, if T is the chopping period, then the ___ |
| 358 | A step-up chopper has ___ |
| 359 | In dc choppers, per unit ripple is maximum when ___ |
| 360 | In dc choppers, the waveforms for input and ___ |
| 361 | In dc choppers, if ___ |
| 362 | A half-wave thyristor converter supplies ___ |
| 363 | The type of the load is ___ |
| 364 | The effect of the source inductance on the ___ |
| 365 | In a three-phase full-converter, the output voltage during overlap is ___ |
| 366 | A six pulse thyristor rectifier bridge is connected to ___ |
| 367 | A 3-phase fully controlled, converter is feeding power into ___ |
| 368 | When the firing angle a of a single-phase fully controlled ___ |
| 369 | When a line commutated converter operates in ___ |
| 370 | In a 3-phase, half wave rectifier, if per phase input voltage is ___ |
| 371 | In a 3-phase controlled bridge rectifier, with an increase of ___ |
| 372 | A single-phase, one pulse controlled circuit has resistance and ___ |
| 373 | In a three-phase-semiconverter ___ |
| 374 | The frequency of ripple in the output of ___ |
| 375 | In a single-phase full-wave SCR circuit with ___ |
| 376 | A half-wave SCR controlled circuit with RL 50 W conducts for ___ |
| 377 | The frequency of ripple in the output voltage of a ___ |
| 378 | Which of the following 3-phase ac to dc converter requires neutral point connection? |
| 379 | In a 3-phase full-converter, the output voltage is ___ |
| 380 | In a single-phase full-converter, the number of ___ |
| 381 | In a single-phase full-converter, if the load current is ___ |
| 382 | In a 3-phase full-converter, if the load-current is ___ |
| 383 | The frequency of the ripple in the output voltage of ___ |
| 384 | In a three-phase full converter, the six SCR”s are ___ |
| 385 | In a three-phase semiconverter, the three-SCRs are triggered at ___ |
| 386 | In a 3-phase semiconverter, for firing angle equal to ___ |
| 387 | In a 3-phase semiconverter, for firing angle less than or ___ |
| 388 | A converter which can operate in ___ |
| 389 | A freewheeling diode is placed across the ___ |
| 390 | In a single-phase semiconverter, for discontinuous conduction and ___ |
| 391 | In a single-phase semiconverter, for ___ |
| 392 | In a single-phase converter with discontinuous conduction and ___ |
| 393 | In a single phase converter with discontinuous conduction and ___ |
| 394 | In a single-phase full converter, if ___ |
| 395 | For discontinuous load current and extinction angle ___ |
| 396 | For continuous conduction, in a single-phase full converter each ___ |
| 397 | A single phase full-wave mid-point thyristor converter uses ___ |
| 398 | A single phase one-pulse controlled circuit has ___ |
| 399 | A single phase half-wave controlled rectifier has ___ |
| 400 | The turn-off time of an MCT is ___ |
| 401 | A MOSFET controlled thyristor has ___ |
| 402 | The blocking capacity of ___ |
| 403 | The nonpunch through IGBT has ___ |
| 404 | The reduction in the on-state voltage drop in ___ |
| 405 | The on-state voltage drop across the ___ |
| 406 | The maximum operating frequency of ___ |
| 407 | The SOA of IGBT is better than that of ___ |
| 408 | The temperature coefficient of resistivity of ___ |
| 409 | An IGBT structure is obtained by ___ |
| 410 | MOS devices should be handled by the package, not ___ |
| 411 | The body layer is connected to source terminal in ___ |
| 412 | The turn-off gain of the GTO is ___ |
| 413 | For a MOSFET, snubber circuits ___ |
| 414 | Paralleling of MOSFET is quite ___ |
| 415 | The on-state voltage drop of a power MOSFET is higher than ___ |
| 416 | The operating frequency of a power MOSFET is higher than ___ |
| 417 | A transistor cannot be protected by a ___ |
| 418 | The typical value of gain in a power BJT is ___ |
| 419 | A power BJT has a high interdigitated base ___ |
| 420 | The SOA of a power device ___ |
| 421 | The conductivity modulation in ___ |
| 422 | The antisaturation arrangement ensure ___ |
| 423 | The turn-off snubber is connected in ___ |
| 424 | The main cause of the second breakdown in ___ |
| 425 | The temperature coefficient of resistivity for ___ |
| 426 | A BJT operates as a ___ |
| 427 | An amplifying gate thyristor has ___ |
| 428 | The inductance of snubber circuit and capacitance of ___ |
| 429 | A GTO like all the other power semiconductor devices requires ___ |
| 430 | A Gate-turn-off thyristor ___ |
| 431 | A reverse conducting thyristor is ___ |
| 432 | Peak inverse rating of ___ |
| 433 | A triac is effectively ___ |
| 434 | The MOSFET switch in its on-state may be ___ |
| 435 | A switched-mode power-supply operation at 20 kHz to 100 kHz range uses as ___ |
| 436 | In a power-MOSFET, switching times are of ___ |
| 437 | Which of the following thyristors are gate turned off device? |
| 438 | Which of the following is preferred for VHF/UHF applications? |
| 439 | When transistors are used in series or parallel, a snubber circuit is ___ |
| 440 | Power MOSFET is a ___ |
| 441 | MOS controlled thyristors have ___ |
| 442 | Which semiconductor power device out of the following is not a current triggered device? |
| 443 | The uncontrolled electronic switch employed in ___ |
| 444 | A triac and SCR are ___ |
| 445 | The device which cannot be triggered by voltage of either polarity is ___ |
| 446 | Which of the following PNPN devices does not have a gate terminal? |
| 447 | Which of the following methods will turn SCS off? |
| 448 | Which of the following devices is a three layer device? |
| 449 | Which of the following PNPN devices has a terminal for synchronising purpose? |
| 450 | Which of the following PNPN devices has two gates? |
| 451 | In its application, an SUS behaves in ___ |
| 452 | As compared to ___ |
| 453 | Which of the following statements is true for firing a triac shown in figure below? |
| 454 | Thyristor A has rated gate current of 2 A and thyristor B is ___ |
| 455 | In a GTO, anode current begins to fall when ___ |
| 456 | In a N-stage sequence controller, each secondary is rated for ___ |
| 457 | A single-phase two stage sequence controller is designed to ___ |
| 458 | For obtaining the output voltage control from V to 2V, the firing angle ___ |
| 459 | For obtaining the output voltage control from ___ |
| 460 | If T1, T2 are kept off and T3, T4 are having a firing angle of ___ |
| 461 | The below given circuit is that of ___ |
| 462 | From the below given statements regarding sequence control of ___ |
| 463 | A two stage sequence control is ___ |
| 464 | Sequence control of ac voltage controllers is employed for ___ |
| 465 | Determine the loss in the snubber circuit, |
| 466 | The ratio Vrms/ Vdc is known as ___ |
| 467 | TRIAC is used in ___ |
| 468 | A single-phase full bridge diode rectifier delivers power to ___ |
| 469 | For a SCR, conduction angle is 120° when average on-state current is ___ |
| 470 | The reverse recovery time of a diode is ___ |
| 471 | The factors governing the induction heating are ___ |
| 472 | Induction heating is a ___ type of heating |
| 473 | The converter circuit which employs turn on and turn off when ___ |
| 474 | Solid State Relays (SSRs) have a ___ |
| 475 | Solid State Relays (SSRs) have ___ |
| 476 | A single-phase ac switch is used in between a 230 V source and load of ___ |
| 477 | ___ can be used as a dc static switch |
| 478 | ___ can be used as a single phase static ac switch |
| 479 | For high power applications ___ |
| 480 | Two six pulse converters used for bipolar HVDC transmission ___ |
| 481 | Two six pulse converters used for bipolar HVDC transmission system, are ___ |
| 482 | In HVDC transmission lines ___ |
| 483 | HVDC transmission lines are ___ as compared to HVAC lines |
| 484 | The negative polarity is used in the monopolar ___ |
| 485 | HVDC transmission has ___ as compared to HVAC transmission |
| 486 | Usually ___ batteries are used in the UPS systems |
| 487 | No discontinuity is observed in case of ___ |
| 488 | Static UPS requires ___ |
| 489 | ___ is used in the rotating type UPS system to supply the mains |
| 490 | ___ is used for critical loads where temporary power failure |
| 491 | Choose the incorrect ___ |
| 492 | SMPS is used for ___ |
| 493 | In a three phase half-wave cycloconverter ___ |
| 494 | In three phase cycloconverters, the reduction factor is ___ |
| 495 | The principle of three phase cycloconverter is to ___ |
| 496 | In the positive half cycle ___ |
| 497 | In the below given cycloconverter circuit ___ |
| 498 | In the positive half cycle from ___ |
| 499 | The single phase bridge type cycloconverter uses ___ |
| 500 | The single phase mid-point type cycloconverter uses ___ |
| 501 | Applications of cycloconverters include ___ |
| 502 | A cycloconverter is a ___ |
| 503 | In the below given voltage controller circuit ___ |
| 504 | A single-phase half wave voltage controller consists of ___ |
| 505 | In the principle of phase control ___ |
| 506 | The AC voltage controllers are used in ___ |
| 507 | Earlier then the semiconductor technology, ___ |
| 508 | In AC voltage controllers the ___ |
| 509 | AC voltage controllers convert ___ |
| 510 | Force-commutated CSIs need ___ |
| 511 | In a 3-phase VSI operating in square-wave mode, the output line ___ |
| 512 | T1, T2 are triggered at ___ |
| 513 | In the below shown, the ideal single-phase CSI circuit has constant ___ |
| 514 | A CSI converters ___ |
| 515 | In current source inverters ___ |
| 516 | In current source inverters (CSIs), the output voltage”s ___ |
| 517 | In current source inverters (CSIs) ___ |
| 518 | In voltage source inverters (VSIs), the output currents ___ |
| 519 | In voltage source inverters (VSIs), the amplitude of the output voltage is ___ |
| 520 | The waveform obtained by ___ |
| 521 | In single-phase modulation of PWM inverters, the 5th order harmonic can be ___ |
| 522 | In single-phase modulation of PWM inverters, the lowest harmonic can be ___ |
| 523 | In three-level modulation ___ |
| 524 | In stepped wave inverters, one of the inverters are gated such as ___ |
| 525 | In case of stepped wave inverters, ___ |
| 526 | Pulses of different widths and heights are superimposed in case of ___ |
| 527 | The output voltage obtained by connecting two inverters through ___ |
| 528 | For harmonic reduction by transformer connection, the output voltages from ___ |
| 529 | Which of the following is used as a harmonic reduction technique in inverters? |
| 530 | A single-phase bridge inverter, fed from a 230 V dc is connected to the ___ |
| 531 | A single-phase bridge inverter, fed from a 230 V dc is connected to ___ |
| 532 | Output voltage of a single-phase bridge inverter, fed from ___ |
| 533 | Control of frequency and control of voltage in 3-phase inverters is ___ |
| 534 | Find, the maximum rms value of the fundamental component of the ___ |
| 535 | A single-phase bridge inverter has a square wave output ___ |
| 536 | A VSI will have a better performance if ___ |
| 537 | In an inverter, if the fundamental output frequency is ___ |
| 538 | In an inverter, if the fundamental output frequency is 45 Hz, then the frequency of ___ |
| 539 | In case of multiple pulse width modulation method, if the amplitudes of ___ |
| 540 | In a PWM inverter, if the frequency of the lowest harmonic is ___ |
| 541 | Calculate the pulse width in case of MPM, if the amplitudes of ___ |
| 542 | In an inverter, if the fundamental output frequency is 50 Hz, then ___ |
| 543 | In MPM the amplitudes of square wave and triangular wave are ___ |
| 544 | In single-phase modulation of PWM inverters, the pulse width is ___ |
| 545 | Increasing the number of pulses (N), ___ |
| 546 | In case of sinusoidal pulse width modulation with ___ |
| 547 | In case of sinusoidal pulse width modulation with MI < 1, the order of the ___ |
| 548 | In case of sinusoidal pulse width modulation with MI < 1, if the number of ___ |
| 549 | In pulse width modulated inverters, the output voltage is controlled by ___ |
| 550 | By controlling the modulation index (MI), ___ |
| 551 | The modulation index (MI) is given by ___ |
| 552 | In PWM, the comparator output is further given to ___ |
| 553 | In sinusoidal pulse width modulation, the comparator output is ___ |
| 554 | In the sinusoidal pulse width modulation, ___ is the reference wave signal |
| 555 | In the sinusoidal pulse width modulation, ___ |
| 556 | In sinusoidal pulse width modulation, ___ |
| 557 | In ___ type of modulation method, the pulse width is not equal for all the pulses |
| 558 | In MPM, ___ order harmonics can be eliminated by a proper choice of |
| 559 | In the multiple pulse width modulation method, the firing pulses are ___ |
| 560 | In MPM, the square wave is the ___ |
| 561 | In the MPM method, the comparator is given ___ |
| 562 | Find the peak value of the fundamental component of voltage ___ |
| 563 | In case of MPM with two pulses per half cycle ___ |
| 564 | In case of MPM with two pulses per half cycle of ___ |
| 565 | The amplitude of the nth harmonic of the two-pulse MPM waveform is ___ |
| 566 | In the multiple-pulse width modulation method with two pulses per ___ |
| 567 | In the multiple-pulse width modulation method, the Fourier ___ |
| 568 | Several equidistant pulses per half cycle are used in ___ |
| 569 | In case of a single-pulse width modulation with the pulse width = 2d, to ___ |
| 570 | In case of a single-pulse width modulation with ___ |
| 571 | Find the peak value of the fundamental component of voltage with ___ |
| 572 | In case of a single-pulse width modulation with the ___ |
| 573 | In case of a single-pulse width modulation with the pulse width ___ |
| 574 | In the single-pulse width modulation method, when the pulse width of ___ |
| 575 | In the single-pulse width modulation method, the Fourier ___ |
| 576 | In the single-pulse width modulation method, the Fourier coefficient ___ |
| 577 | The shape of the output voltage waveform in ___ |
| 578 | In the single-pulse width modulation method, the output voltage ___ |
| 579 | In the single-pulse width modulation method, the output voltage waveform is ___ |
| 580 | In pulse width modulation ___ |
| 581 | Which of the following is not a PWM technique? |
| 582 | In the PWM method ___ |
| 583 | ___ method is an internal method for controlling the inverter output voltage |
| 584 | In the external control of ___ |
| 585 | External control of dc input voltage can be obtained by ___ |
| 586 | In case of the series inverter control, if two inverters are connected in series through a ___ |
| 587 | In the series-inverter control method ___ |
| 588 | The series-inverter control method is ___ |
| 589 | The external control of ac output voltage can be achieved in ___ |
| 590 | The peak value of the line voltage in case of 120° mode of operation of ___ |
| 591 | Find the line voltage VYR when only T3 and T4 are conducting? |
| 592 | If the SCR T1 is gated at 0°, then for 120° mode of ___ |
| 593 | What is the R phase voltage and Y phase voltage when only T3 and T4 are conducting? |
| 594 | What is the B phase voltage when only T1 and T2 are conducting from ___ |
| 595 | If T1 is gated at 0 °, T3 and T5 will start conducting at ___ |
| 596 | What is the R phase voltage when only T1 and T2 are conducting from ___ |
| 597 | Safe commutation can be achieved in case of the ___ |
| 598 | In case of the 120° mode of operation ___ |
| 599 | The 120° mode of operation of a three phase bridge inverter requires ___ |
| 600 | What is the voltage between the B phase and the neutral, when T2, T3 and T4 are conducting? |
| 601 | What is the Y phase voltage, when T2, T3 and T4 are conducting? |
| 602 | Find VRY, when T6, T1 and T2 are conducting ___ |
| 603 | Find VYB, when T6, T1 and T2 are conducting ___ |
| 604 | What is the maximum line voltage value in case of a three-phase VSI in 180° mode? |
| 605 | What are the phase voltages when T1, T2 and T3 are conducting? |
| 606 | What are the phase voltages when T6, T1 and T2 are conducting? |
| 607 | What is the R phase voltage when T1, T6 and T5 are conducting? |
| 608 | What is the peak value of phase voltage in case of 3-phase VSI with ___ |
| 609 | The conducting SCRs from 180 to 240 degrees would be ___ |
| 610 | The diodes D4 and D1 will conduct from ___ |
| 611 | ___ SCRs conduct from 300° to 360° |
| 612 | For a three phase bridge inverter in the 180° mode, ___ |
| 613 | In the figure given below, for 180° mode of operation if T1 is fired at ___ |
| 614 | In the 180° mode VSI, ___ devices conduct at a time |
| 615 | In inverters, to make the supply voltage constant ___ |
| 616 | In the three-phase bridge inverter, each step consists of ___ |
| 617 | The below given inverter circuit is ___ |
| 618 | A three-phase bridge inverter requires minimum of ___ |
| 619 | Identify the circuit diagram given below ___ |
| 620 | Determine the distortion factor (μ) for a full bridge inverter with supply ___ |
| 621 | A single phase full bridge inverter using transistors and ___ |
| 622 | A single phase full bridge inverter using transistors and diodes is ___ |
| 623 | What would be the harmonic factor of lowest order harmonic in case of ___ |
| 624 | A single phase inverter gives rms value of output voltage as 115 V and ___ |
| 625 | Find the distortion factor (μ), for a single phase half wave ___ |
| 626 | A single-phase half bridge inverter is connected to a ___ |
| 627 | A single-phase half bridge inverter is connected to a 230 V dc source which is ___ |
| 628 | The distortion factor (μ) is the ratio of ___ |
| 629 | If Vr is the prms value of the inverter output voltage and ___ |
| 630 | The total harmonic distortion (THD) is the measure of ___ |
| 631 | The HF (Harmonic factor of nth harmonic) is the ratio of ___ |
| 632 | The Total Harmonic Distortion (THD) is the ratio of ___ |
| 633 | The harmonic factor of nth harmonic is given by ___ |
| 634 | In VSI (voltage source inverters) ___ |
| 635 | Let Vs be the amplitude of the output voltage and P be the output power for ___ |
| 636 | The expression for the load voltage up to the fifth harmonic will be ___ |
| 637 | In the following circuit, the diodes D1 to D4 are used to ___ |
| 638 | In a single phase full wave bridge inverter, when the output is ___ |
| 639 | The output voltage from a single phase full wave bridge inverter varies ___ |
| 640 | Identify the below circuit given ___ |
| 641 | Single-phase full bridge inverters requires ___ |
| 642 | The output current wave of a single-phase full bridge inverter on ___ |
| 643 | Find the conduction time of the diodes if the SCRs are ___ |
| 644 | In the below circuit, if ___ |
| 645 | In the below given circuit, T1 is fired at 0,T and so ___ |
| 646 | The output of a single-phase half bridge inverter on R load is ___ |
| 647 | Below given is a ___ |
| 648 | The voltage in a single phase half wave inverter varies between ___ |
| 649 | What is the voltage across the R load when only T2 is conducting? |
| 650 | In a single-phase half wave inverter ___ |
| 651 | What is the voltage across the R load when only T1 is conducting? |
| 652 | Single phase half bridge inverters requires ___ |
| 653 | Identify the circuit given below ___ |
| 654 | ___ based inverters do not require self-commutation |
| 655 | VSIs using IGBTs are turned off by ___ |
| 656 | VSIs using GTOs are turned off by ___ |
| 657 | In a VSI (Voltage source inverter) ___ |
| 658 | Line-commutated inverters have ___ |
| 659 | Inverters converts ___ |
| 660 | A chopper circuit is fed from an input voltage of 20 V delivers a ___ |
| 661 | For the step down chopper shown in the figure below, Vs = 100 V and ___ |
| 662 | A chopper circuit is fed from an input voltage of 20 V delivers a power of ___ |
| 663 | The speed of a separately excited dc motor is controlled below ___ |
| 664 | Which type of commutating circuit will have highest switching losses for ___ |
| 665 | What is the expression for design of commutation capacitance in case of ___ |
| 666 | What is the voltage across the load when T1 and T2 are gated after ___ |
| 667 | When T1 and T2 are conducting, which components act as the commutating components? |
| 668 | In the below given commutated chopper circuit ___ |
| 669 | Identify the below given chopper circuit |
| 670 | Find the expression for peak capacitor voltage in case of ___ |
| 671 | For the below given voltage commutation circuit, find the peak value of ___ |
| 672 | A voltage commutated chopper feeds power to ___ |
| 673 | Identify the below given circuit ___ |
| 674 | A voltage commutated chopper feeds power to an ___ |
| 675 | In the below given circuit, at the instant T1 the main SCR is __ |
| 676 | Below given circuit is ___ |
| 677 | In case of current commutation of ___ |
| 678 | The process of commutating a SCR by applying a reverse voltage to ___ |
| 679 | A step down chopper has Vs = 220 V and is connected to ___ |
| 680 | A type A step down chopper has Vs = 220 V and is connected to ___ |
| 681 | In a type E chopper, if all the four chopper switches are ___ |
| 682 | The expression for the thyristor (chopper switch) current is given by ___ |
| 683 | The AC ripple voltage is given by ___ |
| 684 | Find the expression for the ripple factor in terms of duty cycle α for ___ |
| 685 | When CH4 is turned on and then ___ |
| 686 | For the fourth quadrant operation, the current flows through ___ |
| 687 | For the type E chopper to be operated in the ___ |
| 688 | In the below given type E chopper circuit, when ___ |
| 689 | In the below given type E chopper circuit, when CH3 and CH2 are ___ |
| 690 | In the below shown chopper circuit, when CH3 is ___ |
| 691 | The below given circuit can ___ |
| 692 | The load emf E must be reversed for ___ |
| 693 | For a type E chopper operating in the first quadrant, find the ___ |
| 694 | What is the expression for load voltage when the chopper is ___ |
| 695 | For a type E chopper, when CH2 is first on and then switched off ___ |
| 696 | For the second quadrant operation of ___ |
| 697 | For the first quadrant operation of ___ |
| 698 | A type C chopper can operate in ___ |
| 699 | Identify the given circuit ___ |
| 700 | Find the average output voltage for a type D chopper if it ___ |
| 701 | Find the expression for average output voltage in a type D chopper on ___ |
| 702 | In the below given circuit, if ___ |
| 703 | For a type D chopper, if duty cycle α < 0.5 then ___ |
| 704 | In the below given circuit, if only SW1 is ___ |
| 705 | For a type D chopper, if duty cycle = 0.5 then ___ |
| 706 | For a type D chopper, the average value of output voltage will be ___ |
| 707 | What is the load voltage value when both the chopper switches are on? |
| 708 | In a type-D chopper ___ |
| 709 | A type D chopper is a ___ |
| 710 | A type C chopper is operated with only negative load ___ |
| 711 | A type C chopper is operated with only ___ |
| 712 | In a type C chopper, if only one switch is ___ |
| 713 | Type C chopper consists of ___ |
| 714 | Which type of chopper is used in the regenerative braking of DC motors? |
| 715 | In the below given type C chopper circuit ___ |
| 716 | In the below given circuit ___ |
| 717 | Name the circuit given below ___ |
| 718 | In the current limit control method, when the load current reaches ___ |
| 719 | Which of the following mentioned control strategy/strategies would require ___ |
| 720 | In the current limit control method, the chopper is ___ |
| 721 | The control strategy in which on and off time is guided by ___ |
| 722 | In case of frequency modulation system, ___ |
| 723 | In case of a constant frequency system ___ |
| 724 | In pulse width modulation scheme, ___ |
| 725 | In case of variable frequency system ___ |
| 726 | In constant frequency TRC or pulse width modulation scheme, ___ |
| 727 | In case of TRC (Time Ratio Control), ___ |
| 728 | The type-C chopper or two quadrant type-A chopper has ___ |
| 729 | The below given chopper is that of a ___ |
| 730 | For the type-B chopper shown ___ |
| 731 | For the type-B chopper shown below ___ |
| 732 | A step-down chopper is also called as a ___ |
| 733 | In the figure shown below, the capacitor C is ___ |
| 734 | In the figure shown below, the capacitor C is used to ___ |
| 735 | For a step-up/step-down chopper, if α (duty cycle) = ___ |
| 736 | A step down chopper has input dc voltage of 220 V and R = 10 Ω in series with ___ |
| 737 | A step down chopper has ___ |
| 738 | For a step-up/step-down chopper, if the duty cycle > 0.5 then ___ |
| 739 | The expression for a step-up/step-down chopper with ___ |
| 740 | The below given chopper circuit is that of ___ |
| 741 | For the step-down chopper shown in the ___ |
| 742 | For the step-down chopper shown in the figure below, dc source voltage ___ |
| 743 | For the step-down chopper shown in the figure below, dc source ___ |
| 744 | For a step-down chopper shown in the figure below, dc source ___ |
| 745 | For a step-down chopper, when the duty cycle is increased the average value of ___ |
| 746 | For a step-up chopper, when the duty cycle is increased the average value of ___ |
| 747 | A step-up chopper has input voltage of 220 V and output voltage of ___ |
| 748 | Find the expression for effective input resistance of ___ |
| 749 | A step down chopper is operated at 240V at duty cycle of ___ |
| 750 | For a step-down chopper, find the rms value of ___ |
| 751 | For the below given circuit, find the output current at the ___ |
| 752 | Find the average value of output voltage of a basic ___ |
| 753 | Find the expression for output voltage for a ___ |
| 754 | What is the voltage across the load when the SW is first closed and then opened? |
| 755 | In the below given circuit, when switch (SW) is first switched closed ___ |
| 756 | In the below given circuit, when switch (SW) is on ___ |
| 757 | If Vo is the output voltage and Vs is the input DC voltage, then ___ |
| 758 | In a step down chopper, if Vs = 100 V and the chopper is operated at ___ |
| 759 | In the below given circuit, when switch ___ |
| 760 | In the below given circuit, when switch (SW) is ___ |
| 761 | The below given figure is that of a ___ |
| 762 | Find the output voltage expression for a step down chopper with ___ |
| 763 | If T is the time period for a chopper circuit and α is its ___ |
| 764 | The values of duty cycle (α) lies between ___ |
| 765 | The load voltage of a chopper can be controlled by ___ |
| 766 | What is the duty cycle of a chopper? |
| 767 | A chopper is ___ |
| 768 | Which device can be used in a chopper circuit? |
| 769 | A chopper may be thought as ___ |
| 770 | Choppers converter ___ |
| 771 | In the below given figure, the converter 1 (to the right side) has ___ |
| 772 | If V1 and V2 are the converter output voltages then the ___ |
| 773 | In the below given figure the converter 1 (to the right side) has firing ___power |
| 774 | The reactor is required in a circulating current type ___ |
| 775 | When a line commutated converter operates in the inverter ___ |
| 776 | In circulating current type of dual converters, the nature of voltage across the ___ |
| 777 | The circuit shown below is that of ___ |
| 778 | In a three phase dual converter, converter 1 is operating with ___ |
| 779 | Dual converters handle ___ |
| 780 | Name the circuit shown in the figure below ___ |
| 781 | If V1 and V2 are the instantaneous voltages of the two converter circuits in ___ |
| 782 | The reactor in circulating current type dual converters ___ |
| 783 | Circulating current flows ___ |
| 784 | Choose the correct statement from below ___ |
| 785 | In case of circulating current type dual converters, the reactor is ___ |
| 786 | In case of three-phase dual converter, one of the converter circuits is ___ |
| 787 | Name the given circuit below ___ |
| 788 | What causes circulating current in dual converters? |
| 789 | Choose the correct statement from the below ___ |
| 790 | In circulating current mode dual converters, the circulating current is ___ |
| 791 | In non-circulating current mode dual converters, the circulating current is ___ |
| 792 | For a single-phase dual converter, with converters C1 and C2 connected in ___ |
| 793 | Name the below given circuit ___ |
| 794 | In the below given circuit, the right side converter C2 operates ___ |
| 795 | Find the error in the below given dual converter ___ |
| 796 | A single full converter alone can ___ |
| 797 | The four quadrant operation of dual converters can be ___ |
| 798 | The major advantage of using dual converters is ___ |
| 799 | A dual converters has ___ |
| 800 | Dual converters provide ___ |
| 801 | A M-6 controlled converter or 6-pulse half-wave controlled converter is ___ |
| 802 | Which of the below mentioned converter can operate in both 3-pulse and 6-pulse modes? |
| 803 | In a p-pulse converter, each SCR conducts for ___ |
| 804 | A 3-phase full converter delivers a ripple free ___ |
| 805 | The commutation period when both incoming and outgoing SCRs are ___ |
| 806 | What is the relationship between DF, CDF and PF? |
| 807 | A 3-phase full converter delivers a ripple free load current ___ |
| 808 | A 3-phase full converter delivers a ripple free load current of ___ |
| 809 | In a 3 phase, 12-pulse controlled converter for continuous ___ |
| 810 | In a 3 phase M-6 controlled converter for ___ |
| 811 | Semi-converters are ___ |
| 812 | A 3-phase full converter has an average output voltage of ___ |
| 813 | Each SCR of a 3-phase 6-pulse converter conducts for ___ |
| 814 | The PIV experienced by each SCRs in M-3 converter is ___ |
| 815 | A 3-phase bridge converter is given a three-phase supply in ___ |
| 816 | The range of firing angle for a 3-phase, 3-pulse converter feeding a ___ |
| 817 | Which of the following converter circuits would require a neutral point? |
| 818 | In a 3-phase semi-converter, firing angle is less than 60°, as such ___ |
| 819 | In a 3-phase full wave converter, if V is the maximum value of ___ |
| 820 | In a 3-phase semi-converter, for firing angle less than 60° the ___ |
| 821 | A three-phase semi-converter circuit is given a supply of ___ |
| 822 | A 3-phase full converter feeds power to an R load of ___ |
| 823 | What is the value of voltage at the output terminal when the freewheeling diode (FD) is conducting? |
| 824 | In a three-phase semi-converter, at a time one SCR and ___ |
| 825 | In the below given circuit, __ and __ conduct along with T2 |
| 826 | In the below given circuit, each SCR and diode conduct for ___ |
| 827 | Name the below given circuit |
| 828 | In a three-phase, three-pulse, M-3 type controlled converter T1 starts to ___ |
| 829 | A three-phase, three-pulse, M-3 type controlled converter has firing angle for ___ |
| 830 | A three-phase, three-pulse, M-3 type controlled converter uses ___ |
| 831 | Name the circuit shown below ___ |
| 832 | A single-phase semi-converter is operated from a ___ |
| 833 | A single-phase semi-converter is operated from ___ |
| 834 | Find the value of the power delivered to the voltage source ___ |
| 835 | In the below given circuit, the average value of output voltage is ___ |
| 836 | Find the average output dc voltage of a single-phase semi-converter with ___ |
| 837 | All the modern AC-DC converters are using GTOs instead of ___ |
| 838 | The overlap angle of a phase controlled converter will increase ___ |
| 839 | Consider the following statements regarding phase controlled converters: |
| 840 | A single-phase semi-converter is having continuous conduction, as ___ |
| 841 | For the same triggering angle and ratings ___ |
| 842 | A single-phase semi-converter is connected to ___ |
| 843 | A single-phase semi-converter is connected to a 230 V source and is ___ |
| 844 | For the circuit shown below, T1 and T2 (from top T1 and T2) are both ___ |
| 845 | Find the circuit turn-off time (Tc) for the below given ___ |
| 846 | A single-phase asymmetrical semi-converter employs ___ |
| 847 | A single-phase symmetrical semi-converter employs ___ |
| 848 | A semi-converter with RLE load and a freewheeling diode has ___pow |
| 849 | A semi-converter with RLE load and a freewheeling diode has ___ |
| 850 | A semi-converter circuit gives the following voltage waveform on ___ |
| 851 | For the below given circuit configuration, the SCR is ___ |
| 852 | For the below given circuit configuration, the SCR is fired at ___ |
| 853 | A semi-converter circuit gives the following voltage ___ |
| 854 | In a semi-converter with RLE load during the ___ |
| 855 | In the below shown semi-converter circuit T1 & T2 are fired at ___ |
| 856 | In the below shown semi-converter circuit T1 & T2 are ___ |
| 857 | If in the below given converter configuration, any 3 of the ___ |
| 858 | For the circuit shown below to act as a line commutated ___ |
| 859 | A single phase full converter has discontinues load ___ |
| 860 | A single phase full converter has discontinues ___ |
| 861 | A freewheeling diode placed across ___ |
| 862 | A single phase full converter has average & peak voltage values of ___ |
| 863 | In a single phase semi converter with resistive load and ___ |
| 864 | In a single phase full converter with resistive ___ |
| 865 | A single phase full converter, feeds power to ___ |
| 866 | In the circuit shown below, find the expression of average output voltage if ___ |
| 867 | In case of controlled rectifiers, the nature of the ___ |
| 868 | A single-phase two pulse converter feeds RL load with ___ |
| 869 | In a single phase full converter, for discontinuous load current and ___ |
| 870 | A single phase full wave mid-point SCR converter, uses ___ |
| 871 | A single phase full converter feeds power to ___ |
| 872 | A single phase full controlled bridge converter is connected to ___ |
| 873 | For the below shown converter configuration, find the expression for ___ |
| 874 | A single-phase full converter bridge, is connected to a ___ |
| 875 | A single-phase full converter bridge, is connected to ___ |
| 876 | An SCR has the peak forward ___ |
| 877 | An SCR has the peak forward voltage ___ |
| 878 | Choose the correct option ___ |
| 879 | The below shown rectifier configuration has continues load ___ |
| 880 | A motor load is connected to a single-phase full converter ___ |
| 881 | In inverter operation, with ___ |
| 882 | In converter operation, with output ___ |
| 883 | A single-phase full controlled converted with ___ |
| 884 | Find the expression of the rms value of output voltage for ___p |
| 885 | The below shown rectifier configuration has continues load current, find the ___ |
| 886 | A motor load is connected to a single-phase full ___ |
| 887 | The PIV for each diode in a single-phase, full converter with ___ |
| 888 | A single-phase full converter with B-2 type of connection has ___ |
| 889 | For the below shown circuit has dis-continuous ___ |
| 890 | For the below circuit given ___ |
| 891 | For the below shown circuit with continuous load ___ |
| 892 | A single-phase full converter B-2 type connection has a RLE type of ___ |
| 893 | For the below given circuit, when the devices T1 and T2 are conducting ___ |
| 894 | With respect to the below given circuit ___ |
| 895 | With respect to the below given circuit, from ___ |
| 896 | For the below given circuit ___ |
| 897 | In a B-2 type full controlled bridge converter ___ |
| 898 | A single phase full controlled bridge converter ___ |
| 899 | A single phase full-converter using R load is ___ |
| 900 | A fully controlled converter uses ___ |
| 901 | Find the expression for the average value of the output voltage ___ |
| 902 | The circuit turn-off time of M-2 type connection is ___ |
| 903 | For the circuit below, the transformer ratio is ___ |
| 904 | For a single pulse M-2 rectifier with RL load and ___ |
| 905 | In the below shown circuit, considering the load to be ___ |
| 906 | The below shown single phase controlled rectifier configuration is ___ |
| 907 | An SCR rectifier circuit is designed such that the average ___ |
| 908 | Find the PIV of ___ |
| 909 | A single-pulse transformer with secondary voltage of 230 V, 50 Hz, delivers power to ___ |
| 910 | A single-pulse transformer with secondary voltage of ___ |
| 911 | A 230V, 50Hz, single-pulse SCR is feeding a RL load with ___ |
| 912 | A 230 V, 50 Hz, one-pulse SCR controlled converter has ___ |
| 913 | By using a freewheeling diode (FD) in a rectifier with RL load, the power consumed by ___ |
| 914 | Choose the correct statement with respect to ___ |
| 915 | For the below shown circuit, a motor load (RLE) is connected to ___ |
| 916 | A single-phase half-wave rectifier with a FD is supplied by ___ |
| 917 | Choose the incorrect statement with respect to the use of ___ |
| 918 | A single phase half-wave controlled rectifier ___ |
| 919 | A single-phase HW rectifier with a FD is supplied by ___ |
| 920 | A single-phase half wave rectifier with ___ |
| 921 | In a single-phase half-wave circuit with RL load and freewheeling diode ___ |
| 922 | In a single-phase half-wave circuit with RL load and ___ |
| 923 | In the below given circuit, when the commutating diode or ___ |
| 924 | In the below given circuit, the FD (Freewheeling diode) is forward biased at ___ |
| 925 | Choose the correct statement with respect to the below given circuit |
| 926 | For a half-wave single phase thyristor rectifier circuit with ___ |
| 927 | In case of a single-phase half-wave circuit with ___ |
| 928 | For a half-wave single phase thyristor rectifier circuit with any type of ___ |
| 929 | In case of a single-phase half-wave circuit with RL load, with firing angle ___ |
| 930 | The SCR is gated at ___ |
| 931 | The load voltage waveform from ___ |
| 932 | For a single phase half-wave thyristor circuit with R ___ |
| 933 | For a single phase half-wave thyristor circuit with ___ |
| 934 | A single phase 230 V, 1 kW heater is connected across ___ |
| 935 | A single-phase half wave circuit has ___ |
| 936 | For a certain SCR configuration, the below shown waveform is ___ |
| 937 | A single-phase half-wave thyristor circuit with R load is ___ |
| 938 | For the below given circuit with firing angle ___ |
| 939 | For a single phase thyristor circuit with ___ |
| 940 | Below shown ideal circuit is triggered at a firing angle of ___ |
| 941 | Below shown ideal circuit is triggered at ___ |
| 942 | In a single phase half-wave thyristor circuit with ___ |
| 943 | In the method of phase control, the phase relationship between ___ |
| 944 | In the below given circuit, the SCR is triggered at ___ |
| 945 | The average output voltage is maximum when SCR is ___ |
| 946 | A voltage source Vs = Vm sinωt is connected in series with a ___ |
| 947 | Below is the circuit of a resonant-pulse commutation, the maximum voltage to ___ |
| 948 | Class E commutation is ___ |
| 949 | Parallel-capacitor commutation is ___ |
| 950 | ___ commutation is usually used in phase-controlled rectifiers |
| 951 | Natural commutation of an SCR takes place ___ |
| 952 | At the time of turn-on of the SCR, initial thyristor current is ___ |
| 953 | For the circuit shown in the ___ |
| 954 | The peak thyristor current is ___ |
| 955 | The maximum value of current through ___ |
| 956 | For the circuit shown in the figure ___ |
| 957 | ___ commutation technique is commonly employed in series inverters |
| 958 | The natural reversal of ac supply voltage commutates ___ |
| 959 | The type of commutation in which the pulse to ___ |
| 960 | The type of commutation when the load is commutated by ___ |
| 961 | An SCR is connected in series with ___ |
| 962 | In case of class B commutation or resonant-pulse commutation ___ |
| 963 | In case of class B commutation or resonant-pulse commutation with ___ |
| 964 | The class A commutation or load commutation is ___ |
| 965 | In case of class A type commutation or load commutation with ___ |
| 966 | The thyristor turn-off requires that ___ |
| 967 | The decaying factor in the wave shape of the output pulses from ___ |
| 968 | Find the intrinsic stand-off ratio ___ |
| 969 | The improved version of the UJT oscillator triggering circuit is ___ |
| 970 | If the gating circuits generator negative pulses, then those can be ___ |
| 971 | In case of a cosine firing scheme, ___ |
| 972 | The pulse gating is ___ |
| 973 | The firing-angle delay is ___ |
| 974 | In the thyristor gating circuit, the ZCD is ___ |
| 975 | In the thyristor gating circuit, the supply to the pulse amplifier is ___ |
| 976 | If the RC firing circuit used for firing an SCR is to be used to ___ |
| 977 | Find the value of the charging resistor in case of a UJT firing circuit with ___ |
| 978 | In the UJT firing circuit, the pulses are generated ___ |
| 979 | In case of the UJT firing circuit, when ___ |
| 980 | The UJT terminals are ___ |
| 981 | Pulse triggering can be only used by ___ |
| 982 | For an RC full wave firing circuit the empirical formula for calculating ___ |
| 983 | In case of an RC full wave firing circuit with R load, the voltage across the ___ |
| 984 | For the following RC triggering circuit with R load and a firing ___ |
| 985 | For the following circuit, the SCR ___ |
| 986 | For the following RC triggering circuit with R load and ___ |
| 987 | Find the value of R in case of an RC firing circuit which is to be ___ |
| 988 | The figure shown below is that of pow___ |
| 989 | The figure shown below is that of ___powe |
| 990 | In case of a R firing circuit with ___ |
| 991 | In case of a R firing with R2 as the variable resistance ___ |
| 992 | In the figure given below, the resistance ___ |
| 993 | In case of an RC half wave triggering circuit, the firing angle can be ___ |
| 994 | The diode in the R firing ___ |
| 995 | For a R firing circuit, the maximum value of ___ |
| 996 | In a resistance firing circuit the ___ |
| 997 | The major function of the pulse transformer is ___ |
| 998 | The duty cycle can be written as ___ |
| 999 | Find the triggering frequency when the average gate ___ |
| 1000 | The gate-cathode curve for an SCR is given by ___ |
| 1001 | Find the amplitude of the gate current pulse, when ___ |
| 1002 | The magnitude of gate voltage and gate current for ___ |
| 1003 | Find the average gate power dissipation ___ |
| 1004 | In the complete firing circuit, the driver circuit consists of ___ |
| 1005 | In a 3-phase full converter using six SCRs, gating circuit must ___ |
| 1006 | In a single pulse semi-converter using two ___powe |
| 1007 | In a single-phase full wave rectifier ___ |
| 1008 | An LC filter will have ripple factor value ___ |
| 1009 | C filters are suitable for ___po |
| 1010 | When a certain type of filter is connected across the R load, of ___ |
| 1011 | In case of a C filter, if R (load resistance) is ___ |
| 1012 | In case of an L filter, the ripple current increases ___ |
| 1013 | The current ripple factor (CRF) is the ratio of ___ |
| 1014 | In the below given configuration, L is connected as ___ |
| 1015 | An inductor filter connected in series with a resistive load provides ___ |
| 1016 | A diode rectifier with a C filter will have average output voltage ___ |
| 1017 | A single-phase diode B-2 rectifier is fed from ___ |
| 1018 | When the output current rises, the capacitor ___ |
| 1019 | When a certain type of filter is connected across the R load of ___ |
| 1020 | Examine the below shown ___ |
| 1021 | A capacitor filter or C filter can be used in a rectifier by ___ |
| 1022 | In case of a C filter, the AC is not allowed to pass to ___ |
| 1023 | In case of an L filter connected with a rectifier in series with the ___ |
| 1024 | An L filter is connected ___ |
| 1025 | Choose the pcorrect statement |
| 1026 | In practice the output from the diode rectifier has ___ |
| 1027 | A 3-phase bridge rectifier charges a 240-V ___ |
| 1028 | A 3-phase bridge rectifier charges a ___ |
| 1029 | A 3-phase bridge rectifier, has the average output voltage as ___ |
| 1030 | For a 3-phase 6-pulse diode rectifier, has Vml as the maximum line ___ |
| 1031 | A 3-phase 6-pulse diode rectifier is shown below with ___ |
| 1032 | From the diode rectifier circuit shown below, with ___ |
| 1033 | From the diode rectifier circuit shown below, with phase ___ |
| 1034 | A step-down delta-star transformer, with per-phase turns ___ |
| 1035 | The circuit shown below is that of a ___ |
| 1036 | A step-down delta-star transformer, with per-phase turns ratio of ___ |
| 1037 | A step-down delta-star transformer, with per-phase turns ration of ___ |
| 1038 | In a three-phase half wave 6-pulse mid-point type ___ |
| 1039 | The average value of the output voltage, in a 3-phase half wave diode rectifier with ___ |
| 1040 | In a three-phase half wave diode rectifier, if Vmp is the ___ |
| 1041 | In a three-phase half wave diode rectifier using ___ |
| 1042 | The diodes D1, D2 & D3 are connected to ___ |
| 1043 | In the below shown diode rectifier circuit ___ |
| 1044 | In a three-phase half wave diode rectifier using 3 diodes, each diode conducts ___ |
| 1045 | The diode rectifier circuit given below is ___ |
| 1046 | In a three-phase half wave rectifier usually, the primary side of ___ |
| 1047 | For the circuit shown below, D11 & D14 conduct from? |
| 1048 | A load of R = 60 Ω is fed from 1 phase, 230 V, 50 Hz supply through ___ |
| 1049 | The rectification efficiency for B-2 type & M-2 type full wave diode rectifiers are ___ |
| 1050 | For a single phase, full bridge, diode rectifier excited from ___ |
| 1051 | For the circuit shown below, the load current attains the ___ |
| 1052 | The circuit shown below, will have the output voltage waveform similar to ___ |
| 1053 | For a single phase, full bridge, diode rectifier excited from a ___ |
| 1054 | Choose the correct statement regarding the ___ |
| 1055 | For the circuit shown in the figure below ___ |
| 1056 | The PIV experienced by each of the diodes for the ___ |
| 1057 | In the circuit, let Im be the peak value of ___ |
| 1058 | For the circuit shown below, find the value of ___ |
| 1059 | The PIV experienced by the diodes in the ___ |
| 1060 | For the circuit shown below, find the power delivered to ___ |
| 1061 | In a 1-phase full wave bridge rectifier with M-2 type of connection has ___ |
| 1062 | The below shown circuit is ___ |
| 1063 | In a 1-phase full wave bridge rectifier with M-2 type of ___ |
| 1064 | The below shown circuit is that of ___ |
| 1065 | A single-phase full wave rectifier is ___ |
| 1066 | A single-phase full wave mid-point type diode rectifier requires ___ |
| 1067 | The power delivered to the load in Watts is ___ |
| 1068 | For a single phase half wave rectifier, the rectifier efficiency is ___ |
| 1069 | For the below given circuit, the ripple voltage is ___ |
| 1070 | For the below given circuit, the ___ |
| 1071 | The expression for the average voltage is ___ |
| 1072 | After the supply voltage (Vs) is ___ |
| 1073 | For the below given circuit, after the switch is closed the voltage across ___ |
| 1074 | A 1-phase half wave diode rectifier with R = 1 KΩ, has ___ |
| 1075 | A 1-phase half wave diode rectifier with R load, has input voltage of ___ |
| 1076 | A 1-phase 230V, 1KW heater is connected across a ___ |
| 1077 | Find the average value of output current for a 1-phase HW diode rectifier with ___ |
| 1078 | The switch (shown in green) is closed at ___ |
| 1079 | In a 1-Phase HW diode rectifier with R load, the average value of ___ |
| 1080 | Find the rms value of the output voltage for the ___ |
| 1081 | The peak value of the load current occurs at ___ |
| 1082 | The secondary transformer voltage ___ |
| 1083 | For a single phase half wave rectifier, with R load, the diode is ___ |
| 1084 | For a certain diode based rectifier, the output voltage (average value) is ___ |
| 1085 | In a half-wave rectifier, the ___ |
| 1086 | In the process of diode based rectification, the alternating ___ |
| 1087 | For the circuit shown below find the correct answer ___ |
| 1088 | When diode is connected in series to an AC source & RL load, the conduction time ___ |
| 1089 | When a diode is connected in series with an ___ |
| 1090 | Voltage drop across ___ |
| 1091 | The circuit shown below has the following ___ |
| 1092 | For the circuit shown in the figure below, V9 is the AC voltage source with ___ |
| 1093 | For the circuit shown below find the correct option ___ |
| 1094 | For the circuit shown in the figure below, Vs is the ac voltage ___ |
| 1095 | For the circuit shown in the figure below, consider the diode ___ |
| 1096 | For the circuit shown in the figure below, is ___ |
| 1097 | For the circuit shown in the figure below, consider the diode as ___ |
| 1098 | When the switch is open, the current through the diode in ___ |
| 1099 | When the switch is closed, the steady state current through the ___ |
| 1100 | When the switch (shown in green) is closed, the average current through the ___ |
| 1101 | For the circuit shown below, the capacitor is initially charged to a voltage of ___ |
| 1102 | For the circuit shown below, the capacitor is initially charged to ___ |
| 1103 | For the initially relaxed circuit shown below, if ___ |
| 1104 | For the initially relaxed circuit shown below, the Laplace transform of ___ |
| 1105 | For the initially relaxed circuit shown below, KVL with switch in ___ |
| 1106 | The time constant of a series RL circuit (Ï„) is ___ |
| 1107 | The initial current through the inductor is ___ |
| 1108 | For a diode circuit the voltage across the capacitor is ___ |
| 1109 | As the switch (shown in the green) is pressed, the voltage across ___ |
| 1110 | A circuit is so formed such that source-R-L-diode-switch are all ___ |
| 1111 | In a GTO the n+ layer forms the ___ |
| 1112 | The anode current is ideally limited by ___ |
| 1113 | The GTO can be ___ |
| 1114 | The GTO (gate turn-off thyristor) is ___ |
| 1115 | The TRIAC is most sensitive in the ___ |
| 1116 | The RCT (Reverse Conducting Thyristor) has ___ |
| 1117 | The TRIAC”s terminals are ___ |
| 1118 | The SITH ___ |
| 1119 | In SITH, the magnitude of the anode current can be ___ |
| 1120 | The SITH will act as a diode when ___ |
| 1121 | The SITH is a ___ |
| 1122 | The SITH is ___ |
| 1123 | The SITH has ___ |
| 1124 | ___ device from the thyristor family has its gate terminal connected |
| 1125 | SCRs with a rating of 1000 V & 200 A are available to be used in ___ |
| 1126 | Two parallel connect SCRs have same voltage ___ |
| 1127 | 3 SCRs are connected in ___ |
| 1128 | The most practical way of obtaining a uniform distribution of ___ |
| 1129 | When an extra SCR is connected in series with ___ |
| 1130 | The measure of reliability of string is given ___ |
| 1131 | For a string voltage of 3300 V, let there be ___ |
| 1132 | To have maximum possible string ___ |
| 1133 | The term used to measure the degree of utilization of SCRs connected in ___ |
| 1134 | SCRs are connected in parallel to fulfill the ___ |
| 1135 | In the ___ type of mounting the SCR is pressed between two heat sinks |
| 1136 | For low power SCRs (about 1 Ampere current) ___ |
| 1137 | Heat dissipation from heat sink mainly takes ___ |
| 1138 | Choose the correct option for the equation ___ |
| 1139 | The sink to ambient thermal resistance of ___ |
| 1140 | Which of the following thermal resistance parameters depends on ___ |
| 1141 | The total thermal resistance between junction and ___ |
| 1142 | The dv/dt rating of SCR can be ___ |
| 1143 | Inter-digitating of gate-cathode regions in ___ |
| 1144 | The usual way to accomplish higher gate current for ___ |
| 1145 | Thyristors are used in electronic crowbar protection circuits because it ___ |
| 1146 | The thyristor has the following ___ |
| 1147 | False triggering of the SCRs by varying flux & noise is ___ |
| 1148 | Over-current protection in SCRs is achieved through the ___ |
| 1149 | The effect of over-voltages on SCR are minimized by ___ |
| 1150 | Figure below shows SCR having ___ |
| 1151 | Dv/dt protection is provided to ___ |
| 1152 | The dv/dt protection is provided in ___ |
| 1153 | The local hot spot formation in the cross-section of ___ |
| 1154 | Di/dt protection is provided to the thryistor by ___ |
| 1155 | The thermal resistance between junction & the ___ |
| 1156 | The maximum rms current of ___ |
| 1157 | The amp2-sec rating of the SCR specifies ___ |
| 1158 | For an SCR the average & rms values of ___ |
| 1159 | For a SCR the maximum rms on-state current is ___ |
| 1160 | An SCR has half cycle surge current rating of ___ |
| 1161 | Which among the following anode current waveforms will have ___ |
| 1162 | The finger voltage of an SCR is ___ |
| 1163 | The forward dv/dt rating of ___ |
| 1164 | The voltage safety factor (VSF) for an SCR is ___ |
| 1165 | Latching current for an SCR is 100 mA, a dc source of 200 V is ___ |
| 1166 | Consider the two transistor analogy of ___ |
| 1167 | From the two transistor (T1 & T2) analogy of ___ |
| 1168 | The gate-source voltage is ___ |
| 1169 | Latching current for an SCR is 100 mA, DC source of 200 V is ___ |
| 1170 | The two transistor model of the SCR can ___ |
| 1171 | For an SCR, the gate-cathode characteristic has ___ |
| 1172 | The average gate power dissipation for an SCR is 0.5 Watts the ___ |
| 1173 | Higher the magnitude of ___ |
| 1174 | A tangent drawn from the Y-axis to the ___ |
| 1175 | The area under the curve of the gate characteristics of ___ |
| 1176 | The gate characteristics of thyristor is ___ |
| 1177 | To avoid commutation failure ___ |
| 1178 | For effective turning off of the SCR after the anode current has ___ |
| 1179 | For an SCR the total turn-on time consists ___ |
| 1180 | The latching current is ___ |
| 1181 | For an SCR the total turn-on ___ |
| 1182 | The minimum value of anode current below which it must fall to ___ |
| 1183 | For an SCR the total turn-on time consists of ___ |
| 1184 | During the transition time or ___ |
| 1185 | ___ are semiconductor thyristor devices which can be turned-on |
| 1186 | In the reverse blocking mode the middle junction ___ |
| 1187 | The value of anode current required to maintain the conduction of ___ |
| 1188 | For the SCR to remain in the ___ |
| 1189 | The forward break over voltage is maximum ___ |
| 1190 | Among the following, the most suitable method to turn on ___ |
| 1191 | Usually the forward voltage triggering method is not used to ___ |
| 1192 | A thyristor can be bought from the forward conduction mode to ___ |
| 1193 | For a forward conducting SCR device, as the forward anode to ___ |
| 1194 | The forward break over voltage is ___ |
| 1195 | For an SCR in the forward blocking ___ |
| 1196 | With the anode positive with respect to the ___ |
| 1197 | For an SCR in the reverse blocking mode ___ |
| 1198 | If the cathode of an SCR is made positive with respect to ___ |
| 1199 | The static V-I curve for the SCR is ___ |
| 1200 | In the SCR structure the gate terminal is ___ |
| 1201 | Choose the false statement ___ |
| 1202 | An SCR is ___ |
| 1203 | Which terminal does not belong to the SCR? |
| 1204 | A thyristor (SCR) is ___ |
| 1205 | For MOSFET’s SOA, as the pulse width goes on ___ |
| 1206 | The SOA for ___ |
| 1207 | The SOA for a MOSFET is ___ |
| 1208 | For a BJT, find the maximum power dissipation when the device is ___ |
| 1209 | A device is operating at ___ |
| 1210 | The SOAs provided by the manufacturers are ___ |
| 1211 | As the FSOA increases, the pulse ___ |
| 1212 | The SOAs are plotted always on ___ |
| 1213 | The forward safe operating area (FSOA) pertains to ___ |
| 1214 | For a transistor, the safe operating area (SOA) is ___ |
| 1215 | At present, the state-of-the-art semiconductor devices are ___ |
| 1216 | Let”s say that a transistor is operating at the middle of ___ |
| 1217 | Choose the correct statement ___ |
| 1218 | Which of the following relations is true for a BJT? |
| 1219 | A 1mv of i/p gives an output of 1V, the voltage gain as ___ |
| 1220 | Shown below is the diagram of an ideal super ___ |
| 1221 | In a certain power electronics application, it is required that ___ |
| 1222 | In a Schottky diode, the silicon layer acts as ___ |
| 1223 | As compared to a p-n junction device of ___ |
| 1224 | If the doping levels of the semiconductor is ___ |
| 1225 | In a Schottky diode, the aluminum metal acts as ___ |
| 1226 | Schottky diodes are also called as ___ |
| 1227 | When reverse breakdown occurs in ___ |
| 1228 | Ideally the voltage drop across a conducting diode must be ___ |
| 1229 | A Schottky diode can be switchd off much faster than ___ |
| 1230 | A Schottky diode has ___ |
| 1231 | As compared to a p-n junction diode(of the same rating), a Schottky diode has ___ |
| 1232 | In a Schottky diode, the silcon is usually ___ |
| 1233 | Which of the following are/is the majority charge carriers in a Schottky diode? |
| 1234 | A Schottky diode ___ |
| 1235 | Which of the below mentioned statements is false regarding Schottky diodes? |
| 1236 | Which of the following diodes uses a metal-semiconductor junction? |
| 1237 | In order to reduce the reverse recovery time of ___ |
| 1238 | Shown below is the diagram of an ___ |
| 1239 | In the equilibrium state the barrier, potential across a ___ |
| 1240 | In the equilibrium state, the barrier potential across ___ |
| 1241 | In case of a practical p-n junction diode, the rise in the ___ |
| 1242 | When the p-n junction diode is reversed biased, the width of ___ |
| 1243 | When the p-n junction diode is forward biased, the width of ___ |
| 1244 | In an AC-DC converter, a diode might be used as ___ |
| 1245 | For a p-n junction diode, the peak inverse current & the ___ |
| 1246 | Even after the forward current reduces to ___ |
| 1247 | The power loss in which of the following cases would be the maximum? |
| 1248 | If V & I are the forward voltage & current respectively, then ___ |
| 1249 | A power diode with small softness factor (S-factor) has ___ |
| 1250 | The peak inverse current ___ |
| 1251 | In case of an ideal power diode, the leakage current flows from ___ |
| 1252 | A diode is said to be reversed biased when ___ |
| 1253 | Which of the following is true in case of a power diode with R load? |
| 1254 | The V-I Characteristics of the diode lie in ___ |
| 1255 | Power diode is ___ |
| 1256 | To make a signal diode suitable for ___ |
| 1257 | An ideal power diode must have ___ |
| 1258 | Which of the following is true in case of an unbiased p-n junction diode? |
| 1259 | When a physical contact between a p-region & n-region is ___ |
| 1260 | Lets assume that the doping density in the ___ |
| 1261 | In the p & n regions of the p-n junction the ___ & the ___ are |
| 1262 | Which of the below mentioned statements is false regarding a p-n junction diode? |
| 1263 | In the p & n regions of the p-n junction the ___ |
| 1264 | A p-type semiconductor material is doped with ___ |
| 1265 | The p-region has a greater concentration of ___ |
| 1266 | Gate triggering is the most commonly used method for ___ |
| 1267 | Modified Mc Murray full bridge inverter uses ___ |
| 1268 | Ripple factor RF and form factor FF are ___ |
| 1269 | The power factor at the input terminals of ___ |
| 1270 | The application of gate signal decreases the break over voltage of on SCR |
| 1271 | A static excitation system uses ___ |
| 1272 | A fully controlled bridge converter feeds a highly inductive load ___ |
| 1273 | McMurrary full bridge inverter uses ___ |
| 1274 | In integral cycle control of ac regulator, the input power factor is ___ |
| 1275 | A single phase fully controlled bridge converter is feeding an ___ |
| 1276 | In a 3 phase semiconverter, the output voltage becomes ___ |
| 1277 | In an n stage high frequency series inverter having a ___ |
| 1278 | In a semi converter feeding ___ |
| 1279 | In a full bridge circuit supplying an RLC under ___ |
| 1280 | A class B chopper operates in third quadrant |
| 1281 | For a single phase half wave converter feeding a ___ |
| 1282 | In a dual converter operated in circulating current mode ___ |
| 1283 | Thyristors can be used in controlled heating, excitation systems of ___ |
| 1284 | Thyristors can be used for ___ |
| 1285 | From which instant is the turn off time of ___ |
| 1286 | As compared to a p-n junction diode ___ |
| 1287 | In disc mounting of ___ |
| 1288 | The snubber circuit consists of ___ |
| 1289 | A single phase dual converter consists of ___ |
| 1290 | A class C chopper can operate in first and ___ |
| 1291 | In a 3 phase bridge inverter with 120° mode of ___ |
| 1292 | The duty cycle of a step down chopper is ___ |
| 1293 | A single phase cycloconverter with centre tapped ___ |
| 1294 | A LASCR has ___ |
| 1295 | In Jone chopper, the commutating element ___ |
| 1296 | A dc series motor is coupled to a load whose torque is ___ |
| 1297 | When an SCR is reverse biased ___ |
| 1298 | The load circuit of a single phase ___ |
| 1299 | When a single phase dual converter is operating in ___ |
| 1300 | To turn off an SCR, it is necessary to reduce its current to ___ |
| 1301 | Class A and class B chopper ___ |
| 1302 | Light triggering is very suitable for ___ |
| 1303 | In a modified series inverter ___ |
| 1304 | The number of layers in a Shockley diode are ___ |
| 1305 | In a modified series inverter with two inductors and ___ |
| 1306 | In a bridge inverter with single pulse width ___ |
| 1307 | Which of the following is correct for a BJT? |
| 1308 | In a single phase half wave ac regulator feeding a ___ |
| 1309 | When thyristors are connected in parallel, the current distribution may ___ |
| 1310 | An ideal rectifier should have ___ |
| 1311 | In a bridge inverter ___ |
| 1312 | The number of thyristors in a single phase fully controlled bridge ___ |
| 1313 | The method of triggering SCS is ___ |
| 1314 | The number of leads in a DIAC are ___ |
| 1315 | Forward dv/dt rating of an SCR is ___ |
| 1316 | A crowbar circuit is generally needed for protection under ___ |
| 1317 | In the below figure, the load is highly ___ |
| 1318 | A single phase semiconverter is feeding a highly inductive load and ___ |
| 1319 | The total number of leads in SCR, DIAC and ___ |
| 1320 | The circuit of figure thyristor will conduct for ___ |
| 1321 | In a 3 phase bridge inverter, the gating signals for the ___ |
| 1322 | An SUS is ___ |
| 1323 | The advantage of modified series inverter with ___ |
| 1324 | When a thyristor is conducting, the voltage drop across it ___ |
| 1325 | In a half bridge inverter, the freewheeling diodes are ___ |
| 1326 | Which of the following commutation methods is the overall circuit under damped? |
| 1327 | A TRIAC is equivalent to ___ |
| 1328 | The output voltage of an inverter can be controlled by ___ |
| 1329 | A load commutated chopper circuit has ___ |
| 1330 | Lead mounting for SCR is ___ |
| 1331 | In a single phase full wave regulator, the rms current in ___ |
| 1332 | A step down cycloconverter has an ___ |
| 1333 | The leads in a TRIAC are denoted by ___ |
| 1334 | A single phase full wave regulator feeds a ___ |
| 1335 | The static equalisation circuit for thyristors connected in ___ |
| 1336 | The symbol represents in the figure is for ___ |
| 1337 | In auxiliary commutated chopper, the peak value of ___ |
| 1338 | Which of the following devices has two gates? |
| 1339 | A TRIAC can be turned on ___ |
| 1340 | A class A chopper has an input voltage of ___ |
| 1341 | The output wave of a cycloconverter consists of a number of ___ |
| 1342 | An SCR is triggered at 80° in the ___ |
| 1343 | The cut in voltages for germanium and silicon diodes respectively as ___ |
| 1344 | In a single phase full converter fed by a source having ___ |
| 1345 | The symbol in the figure represents ___ |
| 1346 | In a certain inverter circuit each thyristor carries 26.67 A for ___ |
| 1347 | When the anode current of an SCR starts increasing during ___ |
| 1348 | It is possible to use a freewheeling diode in ___ |
| 1349 | In a full bridge single phase inverter feeding ___ |
| 1350 | In a half bridge inverter circuit fed by a battery of ___ |
| 1351 | A GTO can be turned on and turned off by ___ |
| 1352 | As the firing of a thyristor is delayed, the output voltage of ___ |
| 1353 | The use of free wheeling diode in controlled rectifier improves the ___ |
| 1354 | When a thyristor is conducting, the voltage drop across ___ |
| 1355 | Inverters find applications in ___ |
| 1356 | The commutation method in ___ |
| 1357 | A cycloconverter uses ___ |
| 1358 | A class E chopper ___ |
| 1359 | A fully controlled bridge converter can operate in ___ |
| 1360 | In a half bridge inverter the gate pulses of the two thyristors have ___ |
| 1361 | A 3 phase fully controlled converter is ___ |
| 1362 | In a three phase series inverter, the firing frequency is ___ |
| 1363 | Which statement is correct one? |
| 1364 | In a single phase full wave controlled rectifier using centre tap transformer, the voltage across ___ |
| 1365 | SUS is a PUT and avalanche diode connected between gate and ___ |
| 1366 | If we connect two silicon unilateral switches in ___ |
| 1367 | In rectifier circuits, ripple factor RF and form factor FF are ___ |
| 1368 | A dc chopper feeds an RLE load and has a duty cycle of ___ |
| 1369 | A UJT exhibits negative resistance characteristics when ___ |
| 1370 | In rectifier circuits, the rms value of ac component of ___ |
| 1371 | In a single phase full wave regulator feeding ___ |
| 1372 | The stud in a stud mounted SCR acts as ___ |
| 1373 | When UJT is used for thyristor gate signal, the output of ___ |
| 1374 | Which of these devices have four layers? |
| 1375 | A capacitor C farads is charged to ___ |
| 1376 | McMurray Bredford half bridge inverter uses ___ |
| 1377 | In a power diode the reverse recovery time is the time from ___ |
| 1378 | Chopper always requires forced commutation ___ |
| 1379 | The total number of leads in MOS controlled ___ |
| 1380 | Two single phase semi-converters are connected in ___ |
| 1381 | In a single phase full wave regulator feeding a ___ |
| 1382 | In a full bridge inverter fed by a battery of voltage V, the rms value of ___ |
| 1383 | A single phase semiconverter is supplying RLE load and ___ |
| 1384 | A thyristor circuit is feeding an ___ |
| 1385 | Which chopper circuit uses saturable reactor? |
| 1386 | In auxiliary commutated chopper, the charging and ___ |
| 1387 | When a UJT is used as a relaxation oscillator the ___ |
| 1388 | An ac regulator uses natural ___ |
| 1389 | A single phase converter is fed by a source having an ___ |
| 1390 | For an illumination control circuit it is advisable to ___ |
| 1391 | In a controlled rectifier a freewheeling diode is ___ |
| 1392 | Thyristors connected in series need static and ___ |
| 1393 | In the basic series inverter circuit, the source current has ___ |
| 1394 | A single phase full bridge inverter for ___ |
| 1395 | In a cycloconverter it is possible to ___ |
| 1396 | A single phase half wave converter is feeding ___ |
| 1397 | In a three phase to single phase full wave ___ |
| 1398 | A 3 phase induction motor is controlled by voltage and ___ |
| 1399 | Two thyristors of the same rating and ___ |
| 1400 | In a single phase semiconverter feeding a highly ___ |
| 1401 | Which of these devices is used in relaxation oscillator? |
| 1402 | In a series inverter the ___ |
| 1403 | If 0.5 T is the time period of oscillations and ___ |
| 1404 | The difference between resonant commutation and ___ |
| 1405 | In figure, thyristor Th is in ___ |
| 1406 | A 3 phase series inverter has ___ |
| 1407 | A half bridge inverter ___ |
| 1408 | A bridge type single phase cycloconverter changes the ___ |
| 1409 | The specified maximum junction temperature of thyristors is ___ |
| 1410 | In a parallel ___ |
| 1411 | In a single phase converter using a centre tapped transformer and ___ |
| 1412 | Multiphase choppers are used in ___ |
| 1413 | Typical value of thermal resistance from source to sink of ___ |
| 1414 | A transistor has lower voltage drop during conduction as ___ |
| 1415 | In a half bridge inverter each thyristor is gated at ___ |
| 1416 | In load commutated chopper, the commutating ___ |
| 1417 | A current source inverter has simple commutation circuit |
| 1418 | In the basic series inverter circuit, the source supplies ___ |
| 1419 | In the circuit of figure, the waveshape of load current when ___ |
| 1420 | A single phase bridge type cycloconverter uses ___ |
| 1421 | A voltage VBB is applied across the terminals of ___ |
| 1422 | If a step down chopper is fed by ___ |
| 1423 | As compared to BJT, MOSFET has ___ |
| 1424 | All other parameters remaining the same, a 3 phase bridge inverter with ___ |
| 1425 | In integral cycle control of ac regulators, the period of ___ |
| 1426 | Which of the following devices exhibit negative resistance characteristics? |
| 1427 | A single phase half wave converter is feeding a resistive ___ |
| 1428 | If 4 quadrant operation is required we need ___ |
| 1429 | The symbol in figure is for ___ |
| 1430 | Thyristors connected in ___ |
| 1431 | In an ordinary thyristor ___ |
| 1432 | In a thyristors are ___ |
| 1433 | In a step down chopper using time ratio control, the input voltage is ___ |
| 1434 | The characteristics of which device has peak point and ___ |
| 1435 | In a full bridge inverter, the waveshape of ___ |
| 1436 | In pulse width modulation of ___ |
| 1437 | In a stud mounted SCR, the stud is ___ |
| 1438 | In a 3 phase full converter, the firing angle is ___ |
| 1439 | The gate lead, in a thyristor is ___ |
| 1440 | In a thyristor, the forward breakover voltage ___ |
| 1441 | The two-transistor model of a thyristor consists of ___ |
| 1442 | In brushless excitation system of modern alternators, the main ___ |
| 1443 | A full bridge inverter is fed by a battery of ___ |
| 1444 | In the circuit of figure, the load current when thyristor is ___ |
| 1445 | In a 3 phase semiconverter, the freewheeling diode comes into ___ |
| 1446 | A single phase full converter can operate in ___ |
| 1447 | In a 3 phase bridge inverter with 180° mode of ___ |
| 1448 | A relaxation oscillator uses ___ |
| 1449 | A separately excited dc motor is run from a dc source through ___ |
| 1450 | In a single phase full wave regulator feeding an R-L load, the power factor ___ |
| 1451 | Which of these commutation methods uses an external pulse for commutation?p |
| 1452 | A 3 phase fully controlled bridge converter is fed by ___ |
| 1453 | A single phase cycloconverter feeds a resistance heating pload |
| 1454 | Which chopper circuit operates in all the 4 quadrants? |
| 1455 | The turn on time of SCR is about ___ |
| 1456 | Which converter is used in HVDC transmission? |
| 1457 | McMurray Bedford full bridge inverter uses ___ |
| 1458 | A single phase half wave rectifier circuit has a ___ |
| 1459 | In a thyristor the gate lead is connected to the ___ |
| 1460 | Natural commutation can be ___ |
| 1461 | A chopper cannot be line commutated |
| 1462 | In a fully controlled bridge converter feeding a resistive ___ |
| 1463 | In controlled heating circuits, thyristors act as ___ |
| 1464 | When the core of a saturable reactor is saturated, the inductance is ___ |
| 1465 | When an SCR is conducting, the voltage drop across ___ |
| 1466 | A high dv/dt may cause triggering of ___ |
| 1467 | A 3 phase semiconverter when supplying a certain load has ___ |
| 1468 | In the below figure, the average value of load current is ___ |
| 1469 | In an SCR, the anode current consists of ___ |
| 1470 | A high frequency series inverter consists of ___ |
| 1471 | In a 3 phase semiconverter, the dc output voltage for a ___ |
| 1472 | In a multiphase chopper, the different choppers operate in ___ |
| 1473 | An SCR has a turn on time of ___ |
| 1474 | A Shockley diode can be ___ |
| 1475 | A single phase half wave regulator uses ___ |
| 1476 | When thyristors are connected in series and parallel, it may be ___ |
| 1477 | Which of these commutation methods is used in AC-DC converters? |
| 1478 | A single phase electric heater uses phase controlled ___ |
| 1479 | A thyristor has maximum allowable junction temperature of ___ |
| 1480 | Between which points does UJT exhibit negative ___ |
| 1481 | In a semi converter feeding a resistive load, the firing angle is ___ |
| 1482 | A single phase fully controlled bridge rectifier is fed by ___ |
| 1483 | A dc chopper V = 500 V feeds an electric fraction ___ |
| 1484 | A silicon controlled switch has ___ |
| 1485 | In a parallel inverter ___ |
| 1486 | To protect an SCR against high di/dt we connect ___ |
| 1487 | As regards single phase dual converter ___ |
| 1488 | In a single phase full bridge converter (B-2 connection), the input voltage is ___ |
| 1489 | In a single phase full wave ac regulator, the firing angles in ___ |
| 1490 | A GTO circuit is more compact than ___ |
| 1491 | In the below figure the rms voltage across each half of ___ |
| 1492 | A cycloconverter may be line commutated or ___ |
| 1493 | On load tap changer using thyristors can have a maximum of ___ |
| 1494 | In dielectric heating, the thyristor circuits consist of ___ |
| 1495 | Snubber circuit has an RC series circuit in parallel with ___ |
| 1496 | A thyristor has its gate current ___ |
| 1497 | A single phase full converter gives maximum and ___ |
| 1498 | Present day HVDC converters are ___ |
| 1499 | In a 3 phase semiconverter, the firing frequency is ___ |
| 1500 | The symbol in figure is ___ |
| 1501 | A single phase half wave converter is used to charge ___ |
| 1502 | The gate current required to turn on ___ |
| 1503 | A 3 phase induction motor is controlled by voltage and frequency ___ |
| 1504 | The waveshape of output voltage of half bridge inverter is ___ |
| 1505 | The number of gates in ___ |
| 1506 | In a single phase dual converter ___ |
| 1507 | A thyristor has internal power dissipation of 40W and ___ |
| 1508 | A cycloconverter cannot give a frequency higher than input frequency |
| 1509 | A 3 phase induction motor is fed by a 3 phase ac regulator to ___ |
| 1510 | A single phase full wave regulator feeds ___ |
| 1511 | In a dual converter both converters work as rectifiers |
| 1512 | Induction heating systems require low ___ |
| 1513 | The average load current supplied by ___ |
| 1514 | A 3 phase ac regulator uses ___ |
| 1515 | Which of these triggering methods for series connected SCRs use ___ |
| 1516 | A single phase step up cycloconverter changes ___ |
| 1517 | A static induction thyristor ___ |
| 1518 | A dc separately excited motor has a constant ___ |
| 1519 | A single phase semiconverter has a ___ |
| 1520 | A DIAC has two terminals, anode and ___ |
| 1521 | An RC snubber circuit is used to protect a ___ |
| 1522 | In a single phase full wave regulator feeding R-L load, the ___ |
| 1523 | A dc circuit breaker must use ___ |
| 1524 | An ideal rectifier should have unity harmonic factor ___ |
| 1525 | Figure shows a chopper feeding ___ |
| 1526 | A semi converter operates in ___ |
| 1527 | If Vdc1is the dc output voltage in ___ |
| 1528 | A TRIAC is a bidirectional SCR ___ |
| 1529 | The total number of leads in reverse conducting thyristor is ___ |
| 1530 | A thyristor has a turn on time of ___ |
| 1531 | In a single phase full wave converter (M-2 connection) feeding on ___ |
| 1532 | The number of leads in an SCR are ___ |
| 1533 | A single phase half wave rectifier is feeding a ___ |
| 1534 | Thyristors are not suitable for ___ |
| 1535 | In a thyristor the gate current is increased, then ___ |
| 1536 | A transistor requires a continuous base signal for conduction but ___ |
| 1537 | A single phase half wave controlled rectifier circuit has ___ |
| 1538 | The surge current which an SCR can withstand is ___ |
| 1539 | The terminals of a power MOSFET are ___ |
| 1540 | In a multiphase chopper, all choppers operate ___ |
| 1541 | A dc separately excited motor has constant ___ |
| 1542 | In a circuit using a full wave converter (M-2 connection) the PIV of ___ |
| 1543 | A 3 kV circuit uses SCR of ___ |
| 1544 | Power transistor has lower switching time than ___ |
| 1545 | For a BJT α = 0.98, then β = |
| 1546 | If duty cycle is α and the load is a resistance R, the rms value of ___ |
| 1547 | Current derating may be necessary when thyristors are ___ |
| 1548 | A single phase semiconverter is feeding a highly inductive load and has ___ |
| 1549 | The dynamic equalising circuit consists of a series combination of ___ |
| 1550 | In single phase half wave regulator, the average current over one ___ |
| 1551 | The terminals of a power BJT are ___ |
| 1552 | A two winding transformer is feeding a single phase half wave ___ |
| 1553 | An electric heater is controlled by thyristors through ___ |
| 1554 | In a single phase full wave regulator, the firing angles in ___ |
| 1555 | If the duty cycle of chopper is low the current would not ___ |
| 1556 | A chopper ___ |
| 1557 | The value of capacitor C for dynamic equalising circuit of ___ |
| 1558 | Inverters and choppers use fast switching ___ |
| 1559 | In a step down chopper using pulse width ___ |
| 1560 | The characteristics of a non-linear resistance is ___ |
| 1561 | An SCR is triggered at 40° in the positive ___ |
| 1562 | In a single phase full wave converter (M-2 connection) feeding a ___ |
| 1563 | For a 12 pulse operation, the two 6 pulse units are ___ |
| 1564 | A thyristor has a maximum allowable junction temperature of ___ |
| 1565 | The phenomenon of overlap in converter operation due to ___ |
| 1566 | A semiconverter feeding an RLE load operates in ___ |
| 1567 | The amount of dielectric heating is inversely proportional to ___ |
| 1568 | Two thyristor of same rating and ___ |
| 1569 | In a 3 phase fully controlled converter the firing frequency is ___ |
| 1570 | In the below figure the average load current is ___ |
| 1571 | A cycloconverter can be ___ |
| 1572 | In dielectric heating, the rate of heating cannot be ___ |
| 1573 | In dielectric heating, non-uniform heating ___ |
| 1574 | For dielectric heating, the range of ___ |
| 1575 | Induction heating is ___ |
| 1576 | High frequency induction heating is ___ |
| 1577 | Practically all the heating requirements can be met by ___ |
| 1578 | If the capacitor is loss-free in dielectric heating, the ___ |
| 1579 | A freshly painted layer may be dried electronically by ___ |
| 1580 | If the frequency of current in copper is increased from ___ |
| 1581 | A rod of mild steel kept inside a coil carrying high frequency ___ |
| 1582 | A metal bar is heated electronically by ___ |
| 1583 | Static VAR compensators are used to ___ |
| 1584 | In a DC transmission line ___ |
| 1585 | Bulk power transmission over long HVDC lines are ___ |
| 1586 | The use of high-speed circuit breakers ___ |
| 1587 | A SMPS operating at 20 kHz to 100 kHz range uses as ___ |
| 1588 | HVDC transmission is preferred to ___ |
| 1589 | Uninterruptible supply is ___ |
| 1590 | Which of the following types of heating process is used for surface heating of steel? |
| 1591 | Power factor of synchronous motor can be made leading by ___ |
| 1592 | In variable voltage variable frequency control, to ___ |
| 1593 | The slip power recovery method for the speed control of ___ |
| 1594 | For controlling the speed of three-phase induction motor, the ___ |
| 1595 | Variable speed drives using stator voltage control are ___ |
| 1596 | Thyristor switching circuits are ___ |
| 1597 | In the below system, if the firing angle of the SCRs ___ |
| 1598 | For the large a.c. motor control shown below, if ___ |
| 1599 | In the circuit ___ |
| 1600 | In the circuit, if ___ |
| 1601 | In the inverter circuit shown, if the SCRs are ___ |
| 1602 | In optical triggering technique, LASCR is ___ |
| 1603 | Dynamic equalising networks are used to ___ |
| 1604 | In series string, thyristor having the highest leakage resistance or ___ |
| 1605 | String efficiency is used for ___ |
| 1606 | To obtain the highest possible string efficiency, the SCRs connected in ___ |
| 1607 | Derating factors for parallel connection of thyristors are ___ |
| 1608 | In order to obtain static voltage equalisation in ___ |
| 1609 | Two identical SCRs are placed back-to-back in ___ |
| 1610 | In series connected thyristors ___ |
| 1611 | Equalising circuits are provided across each SCR in ___ |
| 1612 | In a UJT, maximum value of charging resistance is ___ |
| 1613 | Optocouplers combine ___ |
| 1614 | When a UJT is used for triggering of an SCR, the waveshape of ___ |
| 1615 | In a UJT, intrinsic stand off ___ |
| 1616 | In the value of ___ will be |
| 1617 | In the value of ___ |
| 1618 | A PUT relaxation oscillator has ___ |
| 1619 | The value of VG will be ___ |
| 1620 | A PUT has___ |
| 1621 | A UJT has one base resistance of ___ |
| 1622 | A device that does not exhibit negative resistance characteristic is ___ |
| 1623 | It is recommended to use UJT oscillator for gate-triggering of ___ |
| 1624 | UJT oscillators are used for gate-triggering of ___ |
| 1625 | In a commutation circuit, employed to turn-off an ___ |
| 1626 | If a diode is connected in antiparallel with a ___ |
| 1627 | In circuit given below, in order to make a ___ |
| 1628 | The average on-state current for an SCR is 20 A for ____ |
| 1629 | The average on-state current for an SCR is 20 A for ___ |
| 1630 | For normal SCRs, turn-on time is ___ |
| 1631 | There are only silicon controlled rectifiers and ___ |
| 1632 | In a SCR ___ |
| 1633 | An SCR is rated at ___ |
| 1634 | The arrow head of transistor symbol always shows the direction of ___ |
| 1635 | Schottky barrier diode can be used as ___ |
| 1636 | LEDs are fabricated from ___ |
| 1637 | Reverse resistance of a diode is of the order of ___ |
| 1638 | Zener diode is used as the main component in ___ |
| 1639 | Tunnel diode is a ___ |
| 1640 | For highly doped diode ___ |
| 1641 | In the depletion region in the P-N junction there ___ |
| 1642 | In a P-N junction the barrier potential offers opposition to ___ |
| 1643 | Junction breakdown occurs ___ |
| 1644 | About the Power Electronics MCQ category |
