In this article, we shared the 250 plus electronic measurements and instrumentation MCQ questions and answers to test your knowledge.
Electronic Measurements and Instrumentation MCQ Questions
The below list provides all the multiple-choice questions related to the measurement and instrumentation technical subject.
Answers are available at the bottom of the article.
1. A moving-coil permanent-magnet instrument can be used as flux-meter
| A) | by using a high series resistance |
| B) | by eliminating the control springs |
| C) | by using a low resistance shunt |
| D) | by making control springs of large moment of inertia |
2. The brightest spot, on a cathode ray screen, occurs at
| A) | brightness is same all over the screen |
| B) | midway between centre and outer periphery of screen |
| C) | the centre |
| D) | the outer periphery |
3. Electrodynamic types of instruments are used commonly for the measurement of
| A) | current |
| B) | power |
| C) | voltage |
| D) | none of these answers |
| E) | resistance |
4. A dynamometer wattmeter can be used for
| A) | D.C. only |
| B) | A.C. only |
| C) | any of these answers |
| D) | both D.C. and A.C. |
5. The total power delivered to a threephase load is equal to
| A) | algebraic difference of two-watt meters readings |
| B) | vectorial difference of two-watt meters readings |
| C) | algebraic sum of two-wattmeter readings |
| D) | vectorial sum of two-wattmeter readings |
6. In a dynamometer 3-phase power factor meter the planes of the two moving coils are at
| A) | 60° |
| B) | 0° |
| C) | 90° |
| D) | 120° |
7. Transmission channels for telemetry are
| A) | radio links |
| B) | cables |
| C) | all of these answers |
| D) | ultrasonic and magnetic induction data links |
| E) | optical links |
8. ____ is a digital transducer.
| A) | Encoder |
| B) | Thermocouple |
| C) | Photovoltaic |
| D) | Piezoelectric transducer |
9. A C.R.O. can be used to measure
| A) | frequency |
| B) | any of these answers |
| C) | d.c. voltages only |
| D) | a.c. voltages only |
10. For measuring an unknown electrical quantity, select the meter with
| A) | highest range and work down |
| B) | any of these answers |
| C) | lowest range and work up |
| D) | with middle range and work up and down on trial and error basis |
11. For measurements on high voltage capacitors, the suitable bridge is
| A) | Schering bridge |
| B) | Modified De Santy’s bridge |
| C) | Wein bridge |
| D) | None of these answers |
| E) | Any of these answers |
12. Which of the following can be measured by a hot wire anemometer ?
| A) | Very low pressures |
| B) | Liquid discharges |
| C) | Gas velocities |
| D) | Pressure of gases |
| E) | None of these answers |
13. In an A.C. co-ordinate potentiometer, the currents in the phase and quadrature potentiometer are adjusted to be
| A) | out of phase by 90° |
| B) | out of phase by 0° |
| C) | out of phase by 30° |
| D) | out of phase by 60° |
| E) | out of phase by 180° |
14. The minimum number of wattmeters required to measure power in an unbalanced three-wire system is
| A) | three |
| B) | one |
| C) | four |
| D) | two |
15. Primary of an instrument transformer (C.T.) is connected in
| A) | series with the line |
| B) | parallel with the lint |
| C) | any of these answers |
| D) | across two lines |
16. E.m.f. of a weston cell is accurately measured by
| A) | isothermal voltmeter |
| B) | electrodynamic voltmeter |
| C) | hot wire voltmeter |
| D) | electrostatic voltmeter |
17. For measurement of mutual inductance we can use
| A) | Anderson bridge |
| B) | Maxwell’s bridge |
| C) | Heaviside bridge |
| D) | Any of these answers |
18. Which of the following is the best method for the measurement of temperature of hot bodies radiating energy in the visible spectrum ?
| A) | Thermo couple |
| B) | Thermopile |
| C) | Optical pigometer |
| D) | Bolometer |
19. Most common form of A.C. meters met with in every day domestic and industrial installations are
| A) | all of these answers |
| B) | commutator motor meters |
| C) | mercury motor meters |
| D) | induction type single phase energy meters |
20. In a Schering bridge the potential of the detector above earth potential is
| A) | a few volts only |
| B) | 1 kV |
| C) | 10 kV |
| D) | 5 kV |
21. The adjustment of position of shading bands, in an energy meter is done to provide
| A) | creep compensation |
| B) | braking torque |
| C) | none of these answers |
| D) | friction compensation |
22. The phenomenon of ‘creeping’ occurs in
| A) | Ammeters |
| B) | Wattmeters |
| C) | Voltmeters |
| D) | Watthour meters |
23. A wattmeter will be free from the effects of power factor and frequency variations in case
| A) | damping is not provided |
| B) | voltage coil resistance is zero |
| C) | a capacitance is connected in parallel to pressure coil |
| D) | pressure coil inductance is zero |
24. In instruments the term ‘artificial aging’ is associated with
| A) | permanent magnets |
| B) | damping |
| C) | controlling torque |
| D) | springs |
25. A moving iron type ammeter has few turns of thick wire so that
| A) | resistance is less |
| B) | scale is large |
| C) | damping is effective |
| D) | sensitivity is high |
26. In measuring instruments a mirror is provided behind the pointer with a purpose that
| A) | with the help of the mirror it may be seen whether the pointer is bent or not |
| B) | the scale is illuminated through the mirror |
| C) | any of these answers |
| D) | reading errors due to inclined observation are eliminated by removing parallax between the pointer and its image in the mirror |
27. Permanent magnets used in instruments are generally made of
| A) | Y-alloy |
| B) | cast iron |
| C) | stainless steel |
| D) | Alnico |
28. For thermocouple measuring instruments which of the following statements is incorrect ?
| A) | If calibrated on D.C. they cannot be used for A.C. signals |
| B) | Their calibration does not change with time or temperature |
| C) | They are incapable of standing any overloads |
| D) | They read r.m.s. values |
29. Which of the following is the pH value of pure water ?
| A) | 20 |
| B) | Infinity |
| C) | 7 |
| D) | None of these answers |
| E) | 50 |
30. ___ instruments are those which measure the total quantity of electricity delivered in a particular time.
| A) | Indicating |
| B) | Recording |
| C) | Integrating |
| D) | Absolute |
31. Sensitivity of a voltmeter is given by the
| A) | none of these answers |
| B) | ohms per volt |
| C) | reciprocal of full scale deflection current |
| D) | both ohms per volt and reciprocal of full scale deflection current |
32. Moving iron meters are extensively used for the measurement of A.C. voltage and current because
| A) | it is very accurate |
| B) | no current flows through the moving element and is robust |
| C) | its torque weight ratio is more |
| D) | none of these answers |
33. For handling greater currents induction wattmeters are used in conjunction with
| A) | potential transformers |
| B) | none of these answers |
| C) | current transformers |
| D) | power transformers |
34. Ring specimens can be tested for its magnetic properties by
| A) | Any of these answers |
| B) | Maxwell’s bridge |
| C) | A.C. potentiometer |
| D) | Oscillographic method |
| E) | Campbell’s bridge |
35. The ratio error of a current transformer is due to
| A) | exciting current |
| B) | lagging power factor |
| C) | corona effects |
| D) | stray magnetism |
36. In an oscilloscope a moving wave form can be made stationary by adjusting which of the following ?
| A) | horizontal position control |
| B) | sync-amplitude control |
| C) | coarse frequency control |
| D) | vertical positioning control |
37. The electrical power to a meggar is provided by
| A) | battery |
| B) | permanent magnet D.C. generator |
| C) | any of these answers |
| D) | A.C. generator |
38. ___ cannot be used to measure pressure.
| A) | Pyrometer |
| B) | Strain gauge |
| C) | Pirani gauge |
| D) | LVDT |
39. In the measurement of power by two wattmeter method, when the readings of the two wattmeters are equal and opposite, it can be concluded that power factor is
| A) | zero |
| B) | unity |
| C) | leading |
| D) | lagging |
40. In Weston synchronoscope the moving coil is connected across
| A) | bus-bars |
| B) | any of these answers |
| C) | fixed coils |
| D) | incoming alternator |
41. ____ method is suitable for the measurement of a resistance of expected value less than one ohm.
| A) | Loss of charge |
| B) | Substitution |
| C) | Wheatstone bridge |
| D) | Kelvin’s double bridge |
42. The operating voltage of a meggar is about
| A) | 100 V |
| B) | 12 V |
| C) | 40 V |
| D) | 6 V |
43. An ammeter is a
| A) | secondary instrument |
| B) | recording instrument |
| C) | integrating instrument |
| D) | absolute instrument |
44. Following type of instrument is used to measure very small currents of high frequency
| A) | Permanent magnet moving coil type ammeter |
| B) | Dynamometer type instrument |
| C) | Induction type instrument |
| D) | Thermocouple type instrument |
45. The Lissajous pattern of eight, on an oscilloscope, keeps on changing the shape when the ratio of frequencies is
| A) | not exactly 1 : 1 |
| B) | not exactly 2 : 1 |
| C) | exactly 3 : 1 |
| D) | exactly 4 : 1 |
46. The function of shunt in an ammeter is to
| A) | increase the resistance of ammeter |
| B) | increase the sensitivity of the ammeter |
| C) | none of these answers |
| D) | by pass the current |
47. The two pressure coils of a single phase power factor meter have
| A) | the same dimension but different number of turns |
| B) | the same dimensions and the same number of turns |
| C) | the same number of turns but different dimensions |
| D) | none of these answers |
48. Rosette gauges are used to
| A) | measure variable strain |
| B) | compensate for temperature variations |
| C) | measure strain in more than one direction |
| D) | amplify strain values |
49. A phase shifting transformer is used in conjunction with
| A) | D.C. potentiometer |
| B) | Drysdale potentiometer |
| C) | A.C. co-ordinate potentiometer |
| D) | Crompton potentiometer |
50. High voltage tests are
| A) | sustained low frequency tests |
| B) | high frequency tests |
| C) | all of these answers |
| D) | constant direct current tests |
| E) | surge tests |
51. Alternating current is measured by
| A) | electrostatic ammeter |
| B) | induction ammeter |
| C) | moving iron repulsion -type voltmeter |
| D) | permanent magnet type ammeter |
52. ___ can measure only pressure.
| A) | Bubble gauge method |
| B) | Belt type meter |
| C) | Radioactive method |
| D) | Displacer |
53. The chemical effect of current is used in
| A) | D.C. ammeter hour meter |
| B) | none of these answers |
| C) | D.C. energy meter |
| D) | D.C. ammeter |
54. Which of the following is an analogue transducer ?
| A) | Thermistor |
| B) | Strain gauge |
| C) | LVDT |
| D) | All of these answers |
55. An electrodynamic meter can be used to measure
| A) | none of these answers |
| B) | both A.C. voltages and D.C. voltages |
| C) | A.C. voltages |
| D) | D.C. voltages |
56. The power factor of a single phase load can be calculated if the instruments available are
| A) | one voltmeter and one ammeter |
| B) | any of these answers |
| C) | one voltmeter, one ammeter and one energy meter |
| D) | one voltmeter, one ammeter and one wattmeter |
57. The resistance in the circuit of the moving coil of a dynamometer wattmeter should be
| A) | low |
| B) | almost zero |
| C) | none of these answers |
| D) | high |
58. The spring material used in a spring control device should have the following property.
| A) | Should have low specific resistance |
| B) | Should be non-magnetic |
| C) | All of these answers |
| D) | Should not be subjected to fatigue |
| E) | Must be of low temperature co-efficient |
59. Which of the following devices should be used for accurate measurement of low D.C. voltage ?
| A) | None of these answers |
| B) | Small range thermocouple voltmeter |
| C) | D.C. potentiometer |
| D) | Small range moving coil voltmeter |
60. To measure a resistance with the help of a potentiometer it is
| A) | necessary to use a volt ratio box in conjunction with the potentiometer |
| B) | not necessary to standardise the potentiometer |
| C) | necessary to standardise the potentiometer |
| D) | none of these answers |
61. Torque weight ratio will be least in ____ instruments.
| A) | all of these answers |
| B) | dynamometer |
| C) | moving iron |
| D) | moving coil |
62. An induction meter can handle current upto
| A) | 30 A |
| B) | 100 A |
| C) | 10 A |
| D) | 60 A |
63. ____ can measure pressure directly ?
| A) | Bourden tube |
| B) | LVDT |
| C) | Strain gauge |
| D) | Rotameter |
64. In a low power factor wattmeter the pressure coil is connected
| A) | to the load side of the current coil |
| B) | in any of the two meters at connection |
| C) | none of these answers |
| D) | to the supply side of the current coil |
65. A potentiometer works on
| A) | none of these answers |
| B) | magnetic effect |
| C) | electro-magnetic induction |
| D) | heating effect |
66. The temperature of a furnace can be measured by
| A) | bimetallic thermometer |
| B) | clinical thermometer |
| C) | optical pyrometer |
| D) | mercury thermometer |
67. Instrument transformers are
| A) | both current transformers and potential transformers |
| B) | power transformers |
| C) | potential transformers |
| D) | current transformers |
68. The gravity controlled instrument has crowded scale because current is proportional to
| A) | none of these answers |
| B) | sine of deflection angle |
| C) | balancing weight |
| D) | deflection angle |
69. In a single phase power factor meter the phase difference between the currents in the two pressure coils is
| A) | approximately 0° |
| B) | exactly 0° |
| C) | exactly 90° |
| D) | approximately 90° |
70. A double beam oscilloscope has
| A) | two electron guns |
| B) | two different phosphor coatings |
| C) | two screens |
| D) | one wave form divided into two parts |
71. Various adjustments in an energy meter include
| A) | temperature compensation |
| B) | light load or friction |
| C) | all of these answers |
| D) | lag and creep |
| E) | overload and voltage compensation |
72. ___ type instrument can have full scale deflection of 300 degrees.
| A) | Rectifier |
| B) | Hot wire |
| C) | Induction |
| D) | None of these answers |
73. Standard resistor is made from
| A) | maganin |
| B) | silver |
| C) | platinum |
| D) | nichrome |
74. Phosphor coating for cathode ray tubes is provided on
| A) | inside surfaces only |
| B) | both the inside surfaces & outside surfaces |
| C) | within the glass |
| D) | outside surfaces only |
75. It is required to measure the true open circuit e.m.f. of a battery. The best device is
| A) | D.C. potentiometer |
| B) | Ammeter and a known resistance |
| C) | D.C. voltmeter |
| D) | None of these answers |
76. Moving iron instruments are rarely used in low power high resistance circuits because of
| A) | none of these answers |
| B) | high reluctance of magnetic path |
| C) | high resistance of the coil |
| D) | low reluctance of magnetic path |
77. The output of LVDT is in the form of
| A) | pulses |
| B) | linear displacement of core |
| C) | rotary movement of core |
| D) | high frequency signals |
78. In an instrument hysteresis means
| A) | the change in same reading when input is first increased and then decreased |
| B) | the reliability of the instrument |
| C) | the inaccuracy due to chance in temperature |
| D) | the repeatability of the instrument |
79. In a Weston frequency meter, the magnetic axes of the two fixed coils are
| A) | inclined at 60° |
| B) | inclined at 120° |
| C) | parallel |
| D) | perpendicular |
80. In an energy meter braking torque is produced to
| A) | bring energy meter to stand still |
| B) | safe guard it against creep |
| C) | maintain steady speed and equal to driving torque |
| D) | brake the instrument |
81. ___ frequency meter can be used for the measurement of radio frequency.
| A) | Heterodyne |
| B) | Electrical resonance |
| C) | Any of these answers |
| D) | Weston |
82. For measuring a very high resistance we should use
| A) | None of these answers |
| B) | Meggar |
| C) | Wheat stone bridge |
| D) | Kelvin’s double bridge |
83. Dead time of the instrument is
| A) | the largest change of input quantity for which t,here is no output of the instrument |
| B) | none of these answers |
| C) | the time required by an instrument to begin to respond to a change in the measure and |
| D) | the time required by an instrument for initial warming up |
84. A multimeter can be used for measuring
| A) | D.C. quantities only |
| B) | A.C. quantities only |
| C) | D.C. as well as A.C. quantities |
| D) | any of these answers |
85. Which of the following is the merit of a moving iron instrument ?
| A) | It can be used at high frequencies |
| B) | It has linear scale |
| C) | It can be used under severe overload conditions |
| D) | Its current sensitivity is high |
86. Volt box is a component to
| A) | compare voltage in a box |
| B) | measure voltage |
| C) | extend voltage range |
| D) | none of these answers |
87. If the current in a capacitor leads the voltage by 80°, the loss angle of the capacitor is
| A) | 170° |
| B) | 10° |
| C) | 80° |
| D) | 120° |
88. The e.m.f. of a Weston standard cell can be measured by
| A) | hot wire voltmeter |
| B) | electrodynamometer type volt-meter |
| C) | potentiometer |
| D) | galvanometer |
89. Which of the following essential features is possessed by an indicating instrument ?
| A) | Damping device |
| B) | Controlling device |
| C) | All of these answers |
| D) | Deflecting device |
90. Which of the following properties are measured by a Q-meter ?
| A) | Electrical properties of capacitors only |
| B) | Electrical properties of both the coils and capacitors |
| C) | Electrical properties of the coils only |
| D) | Mechanical properties of the coils only |
91. Which of the following methods is used to shield a dynamometer type wattmeter against stray fields ?
| A) | Meter is earthed |
| B) | Meter components are made of nonmagnetic materials |
| C) | Neutral wire connection is provided |
| D) | Meter is housed in a soft iron case |
92. Which of the following instruments cannot be used for the measurement of A.C. as well as D.C. quantities ?
| A) | Induction type instruments |
| B) | Electrostatic instruments |
| C) | Hot wire instruments |
| D) | Moving iron instruments |
93. Aluminium is selected as the material for rotating disc of energy meter because
| A) | it is light |
| B) | it is good conductor |
| C) | all of these answers |
| D) | it is indigenously available |
94. Harmonic distortion is due to which of the following ?
| A) | None of these answers |
| B) | Linear behaviour of circuit elements |
| C) | Change in behaviour of circuit elements due to change in temperature |
| D) | Non-linear behaviour of circuit elements |
95. A multirange instrument has
| A) | variable turns of coil |
| B) | any of these answers |
| C) | multicoil arrangement |
| D) | multiple shunt or series resistances inside the meter |
| E) | multi range meters inside the measurement system |
96. A Hall’s effect pick up can be used for the measurement of
| A) | temperature change |
| B) | magnetic flux |
| C) | relative humidity |
| D) | none of these answers |
| E) | pressure |
97. The switch board instruments
| A) | should be mounted in vertical position |
| B) | either should be mounted in vertical position or should be mounted in horizontal position |
| C) | neither should be mounted in vertical position nor should be mounted in horizontal position |
| D) | should be mounted in horizontal position |
98. Radio frequency can be measured by which of the following frequency meters ?
| A) | Weston frequency meter |
| B) | Electrical resonant frequency meter |
| C) | None of these answers |
| D) | Hetrodyne frequency meter |
99. A high resistance is usually connected in series with an electrostatic voltmeter
| A) | to increase the range |
| B) | to render the measurement accurate |
| C) | for safety reasons |
| D) | none of these answers |
100. The sensitivity inaccuracy of an instrument does not depend on
| A) | hysteresis |
| B) | frequency response |
| C) | all of these answers |
| D) | amplitude distortion |
101. ___ voltmeter has the least power consumption.
| A) | Hot wire type |
| B) | Electrostatic type |
| C) | Moving iron attraction type |
| D) | Induction type |
102. The pressure coil of a wattmeter should be connected on the supply side of the current coil when
| A) | load impedance is low |
| B) | load impedance is high |
| C) | supply voltage is low |
| D) | none of these answers |
103. The scale of a rectifier instrument is
| A) | neither linear nor non-linear |
| B) | linear |
| C) | non-linear |
| D) | either linear or non-linear |
104. Which of the following can be measured by Solometers ?
| A) | Electrical signals |
| B) | Temperature inputs |
| C) | Thermal radiations |
| D) | Optical inputs |
105. A voltage of about 200 V can be measured
| A) | none of these answers |
| B) | a D.C. potentiometer in conjunction with a known resistance |
| C) | a D.C. potentiometer in conjunction with a volt ratio box |
| D) | directly by a D.C. potentiometer |
106. Most sensitive galvanometer is
| A) | elastic galvanometer |
| B) | Duddle galvanometer |
| C) | spot ballistic galvanometer |
| D) | vibration galvanometer |
107. A portable instrument is likely to have ____ clamping.
| A) | gravitational |
| B) | pneumatic |
| C) | eddy current |
| D) | fluid friction |
108. ____ will always indicate true r.m.s. value in respective of the wave form ?
| A) | Moving iron meter |
| B) | None of these answers |
| C) | Digital voltmeter |
| D) | Thermocouple meter |
109. In a Weston synchronoscope, the fixed coils are connected across
| A) | none of these answers |
| B) | bus-bars |
| C) | incoming alternator |
| D) | a lamp |
110. Moving coil and moving iron type instruments can be distinguished by looking at
| A) | size of terminals |
| B) | their range |
| C) | scale |
| D) | pointer |
111. Meter ranges are so selected that the indications are obtained near the
| A) | any of these answers |
| B) | bottom of the scale |
| C) | top of the scale |
| D) | middle of the scale |
112. In hot wire instruments the sensing wire is made of
| A) | copper |
| B) | silver |
| C) | platinum-iridium |
| D) | copper-nickel |
113. The meter constant of single phase energy meter is expressed in terms of
| A) | revolutions/kWh |
| B) | Volts/kWh |
| C) | amps/kW |
| D) | kW/kWh |
114. The internal resistance of a voltmeter must be very high so that
| A) | range is high |
| B) | minimum current passes through the meter |
| C) | loading effect is maximum |
| D) | accuracy is high |
115. The readings of a dynamometer type wattmeter can be highly erratic at
| A) | high voltages |
| B) | fluctuating loads |
| C) | low power factors |
| D) | low frequencies |
116. An ohmmeter is a
| A) | moving coil instrument |
| B) | moving iron instrument |
| C) | dynamometer instrument |
| D) | none of these answers |
117. Murray loop test can be used for location of
| A) | none of these answers |
| B) | both the ground fault and the shortcircuit fault |
| C) | short circuit fault on a cable |
| D) | groundlault on a cable |
118. Damping of the Ballistic galvanometer is made small to
| A) | make the system oscillatory |
| B) | make the system critically damped |
| C) | get first deflection large |
| D) | get minimum overshoot |
119. Basically a potentiometer is a device for
| A) | measuring a current |
| B) | none of these answers |
| C) | comparing two voltages |
| D) | comparing two currents |
| E) | measuring a voltage |
120. Potentiometer is a
| A) | comparison instrument |
| B) | integrating instrument |
| C) | calibrating instrument |
| D) | indicating instrument |
121. The error, when reading at half-scale in an instrument, is
| A) | less than full-scale error |
| B) | greater than full-scale error |
| C) | equal to half of full-scale error |
| D) | equal to full-scale error |
122. Which of the following meters are not used on D.C. circuits ?
| A) | None of these answers |
| B) | Commutator motor meters |
| C) | Mercury motor meters |
| D) | Induction meters |
123. Changes in atmospheric temperature, humidity etc. cause ____ errors.
| A) | systematic |
| B) | environmental |
| C) | cumulative |
| D) | instrumental |
124. Wattmeter cannot be designed on the principle of
| A) | electrostatic instrument |
| B) | electrodynamic instrument |
| C) | moving iron instrument |
| D) | thermocouple instrument |
125. Load cell is essentially a ____
| A) | none of these answers |
| B) | strain gauge |
| C) | thermistor |
| D) | photovoltaic cell |
126. Which of the following instruments can be made using magnetic effect ?
| A) | All of these answers |
| B) | Voltmeters |
| C) | Energy meters |
| D) | Wattmeters |
127. To avoid the effect of stray magnetic field in A.C. bridges we can use
| A) | magnetic screening |
| B) | Wagner earthing device |
| C) | wave filters |
| D) | any of these answers |
128. Null type recorders are
| A) | bridge recorders |
| B) | LVDT recorders |
| C) | any of these answers |
| D) | potentiometric recorder |
129. In optical pyrometer temperature is measured by
| A) | thermocouple effect |
| B) | comparing the brightness of the source with the brightness of a standard source |
| C) | none of these answers |
| D) | photocell principle |
130. The advantage of digital tape recording is that
| A) | it gives highly accurate results |
| B) | it is insensitive to tape speed |
| C) | all of these answers |
| D) | information can be directly fed to digital computers for processing and control |
| E) | it needs simple data conditioner |
131. For measurement of inductance having high value, we should use
| A) | Any of these answers |
| B) | Hay’s bridge |
| C) | Maxwell Wein bridge |
| D) | Maxwell’s bridge |
132. A very accurate voltmeter, when used to measure voltage across a low resistance, gives inaccurate reading because
| A) | any of these answers |
| B) | none of these answers |
| C) | the sensitivity of the meter is too low |
| D) | the current drawn by the meter is too low |
| E) | the higher scale has been selected |
133. ____ is not an element of electropneumatic pressure transmitter.
| A) | LVDT |
| B) | Bellows |
| C) | Flapper nozzle mechanism |
| D) | Operational amplifier |
134. ___ type instrument has identical calibration for A.C. as well as D.C. values ?
| A) | Induction |
| B) | Moving iron |
| C) | Moving coil |
| D) | Hot wire |
135. The household energy meter is
| A) | an indicating instrument |
| B) | none of these answers |
| C) | a recording instrument |
| D) | an integrating instrument |
136. In order to get best results, indicating instruments are
| A) | overdamped |
| B) | underdamped |
| C) | critically damped |
| D) | damped slightly less than the critical value |
137. If an inductance is connected in one arm of bridge and resistances in the remaining three arms
| A) | any of these answers |
| B) | the bridge cannot be balanced |
| C) | the bridge can be balanced if the resistances have some specific values |
| D) | the bridge can always be balanced |
138. A moving-coil permanent-magnet instrument can be used as by using a low resistance shunt.
| A) | flux-meter |
| B) | ammeter |
| C) | ballistic galvanometer |
| D) | voltmeter |
139. A digital voltmeter claims Which of the following advantage ?
| A) | No observational error and faster reading speed |
| B) | It is versatile and accurate |
| C) | All of these answers |
| D) | Its output can be fed to memory devices and stored |
| E) | Low power requirements and less cost |
140. ___ give the value of the quantity to be measured in terms of the constants of the instruments and their direction only.
| A) | Recording instruments |
| B) | Integrating instruments |
| C) | Secondary instruments |
| D) | Absolute instruments |
141. A potentiometer may be used for
| A) | calibration of voltmeter |
| B) | measurement of current |
| C) | measurement of resistance |
| D) | all of these answers |
| E) | calibration of ammeter |
142. By which of the following methods an ammeter can be converted to a voltmeter ?
| A) | By installing the instrument in parallel with the circuit |
| B) | By putting a large resistance in parallel with the actual measuring part of the instrument |
| C) | By putting a large resistance is series with the actual measuring part of the instrument |
| D) | By changing the scale |
143. The pressure coil of a wattmeter should be connected on the supply side of the current coil when
| A) | load impedance is high |
| B) | none of these answers |
| C) | supply voltage is low |
| D) | load impedance is low |
144. Swamping resistance is used to
| A) | compensate the error due to strong magnetic field |
| B) | both compensate the error due to temperature variations and compensate the error due to strong magnetic field |
| C) | none of these answers |
| D) | compensate the error due to temperature variations |
145. Which of the following instruments may be used to measure D.C. voltage accurately ?
| A) | Moving iron type instrument |
| B) | None of these answers |
| C) | Moving coil type instrument |
| D) | Electrodynamic type instrument |
146. Wagner earthing device is used to eliminate errors due to
| A) | electromagnetic coupling |
| B) | both electrostatic coupling and electromagnetic coupling |
| C) | electrostatic coupling |
| D) | none of these answers |
147. A milli-ammeter can be used as
| A) | both voltmeter and ammeter |
| B) | none of these answers |
| C) | a voltmeter |
| D) | an ammeter only |
148. In which part of the scale does the pointer indicate most accurately ?
| A) | In the first third of the scale |
| B) | In about the middle of the scale |
| C) | In the last third of the scale |
| D) | In the first half of the scale |
149. Which of the following devices may be used for extending the range of instruments?
| A) | All of these answers |
| B) | Potential transformers |
| C) | Multipliers |
| D) | Current transformers |
| E) | Shunts |
150. A ____ device prevents the oscillation of the moving system and enables the lat: ter to reach its final position quickly
| A) | any of these answers |
| B) | controlling |
| C) | damping |
| D) | deflecting |
151. Deflection of a hot wire instrument is proportional to
| A) | r.m.s, value of alternating current |
| B) | maximum value of alternating current |
| C) | instantaneous value of alternating current |
| D) | average value of alternating current |
152. For measuring the resistance of the elements of an attenuator which of the following is the best choice ?
| A) | Ohmmeter |
| B) | Maxwell’s bridge |
| C) | Meggar |
| D) | Wheatstone bridge |
153. ___ type instrument has identical calibration for A.C. as well as D.C. values ?
| A) | Hot wire |
| B) | Moving iron |
| C) | Induction |
| D) | Moving coil |
154. The stator of phase shifting transformer for use in conjunction with an A.C. potentiometer usually has a
| A) | single-phase winding |
| B) | two-phase winding |
| C) | any of these answers |
| D) | three-phase winding |
155. Commonly used standard capacitor is
| A) | electrostatic type |
| B) | multilayer parallel plate type |
| C) | spherical type |
| D) | concentric cylindrical type |
156. Which of the following cannot be measured by Ring-balance meter ?
| A) | Differential pressure |
| B) | Flow |
| C) | Pressure |
| D) | Mass flow rate |
157. Moving parts of instruments are supported in ____ bearings.
| A) | jewelled |
| B) | ball |
| C) | bush |
| D) | roller |
158. To measure an A.C. voltage by using an A.C. potentiometer, it is desirable that the supply for the potentiometer in taken
| A) | from a source which is not the same as the unknown voltage |
| B) | from a battery |
| C) | any of these answers |
| D) | from the same source as the unknown voltage |
159. An induction wattmeter measures
| A) | only the true power |
| B) | the apparent power |
| C) | the true power and the reactive power |
| D) | the reactive power |
160. ___ instrument is free from hysteresis and eddy current errors.
| A) | Moving coil permanent magnet type |
| B) | Electrostatic |
| C) | Moving coil dynamometer type |
| D) | Moving iron |
161. Which of the following bridges is used to measure power factor ?
| A) | Wien’s bridge |
| B) | Schering bridge |
| C) | Maxwell bridge |
| D) | Kelvin bridge |
162. For protecting a galvanometer during transport
| A) | the terminals are kept open circuited |
| B) | a capacitor is connected across the terminals |
| C) | critical damping resistance is connected across the terminals |
| D) | the terminals are kept shorted |
163. Which of the following is measured by using a vector voltmeter ?
| A) | All of these answers |
| B) | Complex insertion loss |
| C) | Amplifier gain and phase shift |
| D) | Filler transfer functions |
164. The ratio of maximum displacement deviation to full scale deviation of the instrument is called
| A) | precision or accuracy |
| B) | linearity |
| C) | dynamic deviation |
| D) | static sensitivity |
165. Which of the following gets varied by the focus adjustment of an oscillograph ?
| A) | Filament voltage |
| B) | Second anode voltage |
| C) | Grid voltage of cathode ray tube |
| D) | Accelerating voltage |
166. The dissipation factor of a capacitor can be measured with
| A) | Campbell bridge |
| B) | Schering bridge |
| C) | Galvanometer |
| D) | Potentiometer |
167. High voltage tests are
| A) | surge tests |
| B) | constant direct current tests |
| C) | high frequency tests |
| D) | sustained low frequency tests |
| E) | all of these answers |
168. In a meggar controlling torque is provided by
| A) | coil |
| B) | spring |
| C) | gravity |
| D) | eddy current |
169. Relative permitlivity can be measured by ____ bridge
| A) | Wheatstone |
| B) | De santy |
| C) | Schering |
| D) | Hay’s |
170. Which of the following will happen if a voltmeter is connected like an ammeter in series to the load?
| A) | A very high current will flow |
| B) | The meter will burn out |
| C) | The measurement will be too high |
| D) | There will be almost no current in the circuit |
171. In order to achieve high accuracy, the slide wire of a potentiometer should be
| A) | as short as possible |
| B) | neither too small not too large |
| C) | as long as possible |
| D) | very thick |
172. In electrical measuring instruments, electrical energy is converted to
| A) | heat energy |
| B) | mechanical energy |
| C) | chemical energy |
| D) | light energy |
173. Which of the following is an essential part of a motor meter ?
| A) | All of these answers |
| B) | An operating torque system |
| C) | A braking device |
| D) | Revolution registering device |
174. Which of the following cannot be measured by multimeters ?
| A) | Resistance |
| B) | Voltage |
| C) | Frequency |
| D) | Current |
175. Control springs are made up of
| A) | steel |
| B) | copper |
| C) | silver |
| D) | phosphor bronze |
176. Operating torques in analogue instruments are
| A) | vibration and balancing |
| B) | deflecting, control and damping |
| C) | deflecting and control |
| D) | deflecting and damping |
177. When the damping of an instrument is adjusted to enable the pointer to rise quickly to its deflected position without overshooting, in that case the instrument is said to be
| A) | dead beat |
| B) | under-damped |
| C) | off beat |
| D) | over-damped |
178. LVDT possesses the following advantage
| A) | Excellent repeatability |
| B) | Infinite resolution |
| C) | All of these answers |
| D) | High linearity of output |
179. The input impedance of a C.R.O. is
| A) | zero |
| B) | around 1000 ohms |
| C) | around 100 ohms |
| D) | around one mega-ohm |
180. ___ is the commonly used material for thermocouples.
| A) | Platinum-rhodiuna |
| B) | Chromel-alumel |
| C) | Any of these answers |
| D) | Chromel-copal |
181. If voltage supply to the energy meter is more than the rated value, energy meter will run
| A) | none of these answers |
| B) | either of fast or slow |
| C) | fast |
| D) | slow |
182. Induction type single phase energy meters measure electric energy in
| A) | kW |
| B) | kWh |
| C) | None of these answers |
| D) | Wh |
| E) | VAR |
183. In majority of instruments damping is provided by
| A) | fluid friction |
| B) | eddy currents |
| C) | spring |
| D) | all of these answers |
184. The accuracy of a meter is determined by ____ deflection.
| A) | full-scale |
| B) | one-tenth of full scale |
| C) | one-fourth of full scale |
| D) | half-scale |
185. Which of the following is determined by a hydrometer ?
| A) | Specific gravity of liquids |
| B) | Specific gravity of gases |
| C) | Relative humidity |
| D) | Specific gravity of solids |
186. Air friction clamping is achieved by the movement of aluminium piston in a cylinder when
| A) | piston will have close fitting in the cylinder so,that no air can pass from the circular contact between the two |
| B) | none of these answers |
| C) | piston will have small circular clearance so that air can pass with hinderance |
| D) | piston will have circular clearance so that air can pass freely |
187. Meggar will give resistance values which
| A) | remain constant irrespective of the speed |
| B) | decrease with the speed of the hand driven dynamo |
| C) | any of these answers |
| D) | increase with the speed of the hand driven dynamo |
188. In a 3-phase power measurement by two wattmeter method the reading of one of the wattmeter was zero. The power factor of the load must be
| A) | zero |
| B) | 0.3 |
| C) | 0.5 |
| D) | unity |
189. Which of the following are integrating instruments ?
| A) | Ammeters |
| B) | Ampere-hour and watt-hour meters |
| C) | Wattmeters |
| D) | Voltmeters |
190. If an instrument has cramped scale for larger values, then it follows
| A) | none of these answers |
| B) | square law |
| C) | uniform law |
| D) | logarithmic law |
191. Which of the following properties a damping oil must possess ?
| A) | Should be non-evaporating |
| B) | The viscosity of the oil should not change with the temperature |
| C) | All of these answers |
| D) | Must be a good insulator |
| E) | Should not have corrosive action upon the metal of the vane |
192. A dummy strain gauge is used to
| A) | none of these answers |
| B) | compensate for temperature variations |
| C) | improve the stability of the system |
| D) | increase the sensitivity of measuring system |
193. ____ is used to measure flow of air around an aeroplane.
| A) | Venturimeter |
| B) | Rotameter |
| C) | Orifice |
| D) | Anemometer |
194. The pointer of an indicating instrument should be
| A) | either very light or very heavy |
| B) | neither very light nor very heavy |
| C) | very heavy |
| D) | very light |
195. Scale of an instrument will be uniform if
| A) | deflecting torque varies directly as the deflection angle and control torque varies directly as the deflection angle |
| B) | damping torque varies directly as the deflection angle |
| C) | deflecting torque varies directly as the deflection angle |
| D) | control torque varies directly as the deflection angle |
196. The advantage of moving coil permanent magnet type instrument is
| A) | low power consumption |
| B) | all of these answers |
| C) | efficient eddy current damping |
| D) | no hysteresis loss |
197. For measuring current at high frequency we should use
| A) | none of these answers |
| B) | moving iron instrument |
| C) | thermocouple instrument |
| D) | electrostatic instrument |
198. Which of the following resistances is shown by a needle in a meggar not in operation ?
| A) | none of these answers |
| B) | infinity |
| C) | 1000 ohms |
| D) | 500 ohms |
| E) | zero ohm |
199. The use of ____ instruments is merely confined within laboratories as standardizing instruments.
| A) | absolute |
| B) | recording |
| C) | indicating |
| D) | integrating |
| E) | none of these answers |
200. A wave guide acts as ____ a pass filter
| A) | band |
| B) | high |
| C) | none of these answers |
| D) | low |
201. A Weston synchronoscope is a
| A) | dynamometer instrument |
| B) | moving iron instrument |
| C) | moving coil instrument |
| D) | none of these answers |
202. Which of the following can be measured with the help of piezo-electric crystal ?
| A) | Velocity |
| B) | Temperature |
| C) | None of these answers |
| D) | Flow |
| E) | Acceleration |
203. In a vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of
| A) | 0.25 Hz |
| B) | 0.5 Hz |
| C) | 1.5 Hz |
| D) | 0.1 Hz |
204. ___ can measure only level.
| A) | Strain gauge |
| B) | Radioactive method |
| C) | Bellow |
| D) | Diaphragm |
205. The power of a n-phase circuit can be measured by using a minimum of
| A) | 2n wattmeter elements |
| B) | (n + 1) wattmeter elements |
| C) | n wattmeter elements |
| D) | (n – 1) wattmeter elements |
206. The multiplier and the meter coil in a voltmeter are in
| A) | none of these answers |
| B) | series |
| C) | parallel |
| D) | series-parallel |
207. ___ is a low cost thermocouple
| A) | Tungsten-rhenium |
| B) | Chromel-constantan |
| C) | Rhodium-indium |
| D) | Iron-constantan |
208. An induction wattmeter can be used for
| A) | A.C. only |
| B) | D.C. only |
| C) | any of these answers |
| D) | both D.C. and A.C. |
209. The reed frequency is essentially
| A) | a deflection measuring system |
| B) | an oscillatory measuring system |
| C) | a vibrational measuring system |
| D) | a recording measuring system |
210. In the case of indicating instruments the function of the control spring is
| A) | to pass electric current to moving system |
| B) | to apply controlling torque |
| C) | to apply controlling torque and to pass electric current to moving system |
| D) | none of these answers |
211. Which of the following is the most suitable transducer for monitoring continuously variations in very fine thickness (say of paper in a paper industry) ?
| A) | Diaphragm |
| B) | LVDT |
| C) | Strain gauge |
| D) | Any of these answers |
| E) | Capacitance transducer |
212. A dummy bridge employing strain gauge provides ____
| A) | stability |
| B) | linearity |
| C) | temperature compensation |
| D) | none of these answers |
213. In the measurement of power by two wattmeter method, when the readings of the two wattmeters are equal and opposite, it can be concluded that power factor is
| A) | unity |
| B) | zero |
| C) | lagging |
| D) | leading |
214. ___ bridge is preferred for the measurement of inductance having high Q-factor.
| A) | Desauty |
| B) | Maxwell |
| C) | Hay |
| D) | Owen |
215. Which of the following can be measured by the use of a Schering bridge ?
| A) | All of these answers |
| B) | Dielectric loss and power factor |
| C) | Frequency and capacitance |
| D) | Variable resistances |
216. Hot wire instruments read
| A) | r.m.s. value |
| B) | average value |
| C) | peak value |
| D) | none of these answers |
217. A Weston frequency meter is
| A) | dynamometer instrument |
| B) | moving iron instrument |
| C) | moving coil instrument |
| D) | none of these answers |
218. Weston cell is a
| A) | good standard of voltage |
| B) | none of the above |
| C) | good source of current |
| D) | good source of power |
219. In a 3-phase power measurement by two wattmeter method, both the wattmeters had identical readings.
The power factor of the load was
| A) | unity |
| B) | 0.8 lagging |
| C) | zero |
| D) | 0.8 leading |
220. Which of the following instruments can be used for measuring 132 kV A.C. voltage ?
| A) | Moving coil voltmeter |
| B) | Moving iron voltmeter |
| C) | Electrostatic voltmeter |
| D) | Hot wire voltmeter |
221. ___ bridge is used for the precise measurement of inductances over a wide range.
| A) | Maxwell |
| B) | Wien’s |
| C) | Hay’s |
| D) | Anderson |
222. A moving iron instrument can be used for
| A) | D.C. only |
| B) | both D.C. and A.C. |
| C) | none of these answers |
| D) | A.C. only |
223. The rectifier instrument is not free from
| A) | wave shape error |
| B) | frequency error |
| C) | temperature error |
| D) | all of these answers |
224. To measure radio frequency, the suitable frequency meter is
| A) | Weston frequency meter |
| B) | electrical resonance frequency meter |
| C) | hetrodyne frequency meter |
| D) | reed vibrator frequency meter |
225. The electrical power to a meggar is provided by
| A) | any of these answers |
| B) | permanent magnet D.C. generator |
| C) | battery |
| D) | A.C. generator |
226. Thermistors have ____ temperature coefficient.
| A) | low and negative |
| B) | high and positive |
| C) | low and positive |
| D) | high and negative |
227. In a portable instrument, the controlling torque is provided by
| A) | gravity |
| B) | spring |
| C) | eddy currents |
| D) | all of these answers |
228. By a ‘Rotameter’ we can measure
| A) | flow |
| B) | specific gravity |
| C) | viscosity |
| D) | rotation |
229. Systematic errors are
| A) | environmental errors |
| B) | instrumental errors |
| C) | all of these answers |
| D) | observational errors |
230. ___ meter has the best accuracy
| A) | Rectifier type |
| B) | Thermocouple |
| C) | Moving-iron |
| D) | Moving-coil |
231. A dynamometer type wattmeter has
| A) | logarithmic scale |
| B) | uniform scale |
| C) | non-linear scale |
| D) | square law scale |
232. Unit of deflection sensitivity of CRO is
| A) | none of these answers |
| B) | meter per volt |
| C) | mm/V |
| D) | mm per mV |
| E) | V/mm |
233. Meggar is operated by
| A) | an external voltage source |
| B) | internal battery |
| C) | none of these answers |
| D) | an internal hand driven generator |
234. An instrument’s reliability means
| A) | the degree to which the repeatability continues to remain within specific limits |
| B) | the extent to which the characteristics remain linear |
| C) | the life of the instrument |
| D) | all of these answers |
235. For malting shunts the material suitable is that which has
| A) | same resistance temperature co-efficient as the coil of the instrument |
| B) | negligible thermoelectric e.m.f. with copper |
| C) | been annealed properly so that its resistance does not change with time |
| D) | all of these answers |
236. Damping in an instrument provides
| A) | good accuracy |
| B) | braking action on a meter pointer |
| C) | starting torque on the meter pointer |
| D) | counter torque to deflection torque |
237. A Q-meter measures
| A) | accurate values of electrical quantities |
| B) | properties of the coils |
| C) | losses in a capacitor |
| D) | frequency |
238. The instrument used for the measurement of power at 500 MHz is
| A) | bolometer |
| B) | compensated wattmeter |
| C) | none of these answers |
| D) | electrodynamometer wattmeter |
239. A phase shifting transformer is used in conjunction with
| A) | Drysdale potentiometer |
| B) | D.C. potentiometer |
| C) | A.C. co-ordinate potentiometer |
| D) | Crompton potentiometer |
240. A power factor meter has _____ control springs.
| A) | no |
| B) | four |
| C) | one |
| D) | two |
241. In a low power factor wattmeter the compensating coil is connected
| A) | in series with pressure coil |
| B) | in parallel with current coil |
| C) | in parallel with pressure coil |
| D) | in series with current coil |
242. The principle of Pirani gauge is based on ____ of the medium.
| A) | none of these answers |
| B) | combustibility |
| C) | humidity |
| D) | thermal conductivity |
243. In resistance thermometers platinum is used because of
| A) | none of these answers |
| B) | low cost, high stability and wide operating range |
| C) | low cost and high stability |
| D) | low cost |
244. ___ instrument will draw least current from the circuit in which it is incorporated.
| A) | Rectifier |
| B) | Hot wire |
| C) | Thermocouple |
| D) | Electrostatic |
245. The principle on which vector voltmeter is based is
| A) | that it measures the amplitude of a single at two points and at the same time measures their phase difference |
| B) | that it works on the principle of complex variation |
| C) | same as digital meter |
| D) | that it measures the response of linear ramp voltage |
246. ___ damping method is common in moving coil instruments.
| A) | Spring |
| B) | Eddy current |
| C) | Air |
| D) | Fluid |
247. In an Anderson bridge, the unknown inductance is measured in terms of
| A) | known capacitance and resistance |
| B) | known resistance |
| C) | known inductance and resistance |
| D) | known inductance |
248. Synchro is a
| A) | an angular position transducer |
| B) | parabolic transducer |
| C) | a variable transducer |
| D) | a synchronizing transducer |
249. Two holes in the disc of energymeter are drilled at the opposite sides of the spindle to
| A) | increase its braking torque |
| B) | eliminate creeping at no load |
| C) | improve its ventilation |
| D) | increase its deflecting torque |
250. The cathode of a C.R.O. is usually coated with
| A) | tungsten or thorium oxide |
| B) | alkali metals |
| C) | barium or strontium oxide |
| D) | copper oxide |
251. ____ is not a signal conditioner
| A) | Amplifier |
| B) | Equalising network |
| C) | Damping network |
| D) | Signal converter |
252. The Q-meter Works on the principle of
| A) | mutual inductance |
| B) | parallel resonant circuit |
| C) | series resonant circuit |
| D) | self-inductance |
253. The static error band of an instrument implies
| A) | the error produced when the pen is stopped at some deflection |
| B) | the error introduced in low varying inputs |
| C) | the accuracy of the instrument |
| D) | the irrepeatibility of the instrument |
254. The desirable static characteristics of a measuring system are
| A) | accuracy and reproducibility |
| B) | accuracy, sensitivity and reproducibility |
| C) | drift and dead zone |
| D) | static error |
255. Which of the following devices may be used to measure accurately the interelectrode capacitances ?
| A) | Schering’s bridge |
| B) | Wien’s bridge |
| C) | VTVM |
| D) | De Santy’s bridge |
256. Commonly used instruments in power system measurement are
| A) | induction |
| B) | rectifier |
| C) | moving coil or iron |
| D) | electrostatic |
257. The disc of an instrument using eddy current damping should be of
| A) | none of these answers |
| B) | conducting and non-magnetic material |
| C) | conducting and magnetic material |
| D) | non-conducting and magnetic material |
258. A universal RLC bridge uses
| A) | Maxwell Wein bridge for measurement of inductance and Wein bridge for measurement of capacitance |
| B) | Any of these answers |
| C) | Maxwell bridge configuration for measurement of inductance and De Santy’s bridge for measurement of capacitance |
| D) | Maxwell Wein bridge for measurement of inductance and modified De Santy’s bridge for measurement of capacitance |
259. In brewing process the degree of fermentation is measured by
| A) | combustibility meter |
| B) | conductivity meter |
| C) | any of these answers |
| D) | pH meter |
| E) | bolometer |
260. ___ is an instrument which measures the insulation resistance of an electric circuit relative to earth and one another.
| A) | Meggar |
| B) | Current transformer |
| C) | None of these answers |
| D) | Tangent galvanometer |
261. A ____ is used to measure frequency in wave guides.
| A) | klystron. |
| B) | bolometer |
| C) | cavity resonator |
| D) | galiometer |
262. When a capacitor was connected to the terminal of ohmmeter, the pointer indicated a low resistance initially and then slowly came to infinity position. This shows that capacitor is
| A) | none of these answers |
| B) | all right |
| C) | faulty |
| D) | short-circuited |
263. Resistances can be measured with the help of
| A) | wattmeters |
| B) | ohmmeters and resistance bridges |
| C) | all of these answers |
| D) | voltmeters |
| E) | ammeters |
264. An instrument transformer is used to extend the range of
| A) | electrostatic instrument |
| B) | any of these answers |
| C) | moving coil instrument |
| D) | induction instrument |
265. In an ammeter, the shunt resistance is usually ____ meter resistance.
| A) | of any value |
| B) | equal to |
| C) | greater than |
| D) | less than |
266. A sensitive galvanometer produces large deflection for a
| A) | large value of current |
| B) | small value of current |
| C) | none of these answers |
| D) | large value of voltage |
| E) | large value of power |
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