In this article, we published the 100 microelectronics and integrated circuits objective and answers for electrical and instrumentation engineers.
MicroElectronics Objective Questions
The below list provides all the multiple-choice questions (MCQ) related to microelectronics and integrated circuits.
Answers are available at the bottom of the article.
1. Dual-in-line pick up (DIP) is the most popular IC package because
| A) | It ruggedly resists vibration due to its solid construction |
| B) | It is one of the tiniest packages known |
| C) | It is low in cost |
| D) | All of the answers |
2. If the base 10 is called a decimal number system, then the base 12 is called
| A) | Duodecimal number system |
| B) | All of the answers |
| C) | Bidecimal number system |
| D) | Duodecimal number system |
3. What is the package suffix code for a plastic dual-in-line for surface mounting on PC board?
| A) | D |
| B) | N |
| C) | P |
| D) | J |
4. What is the most commonly used type of linear IC?
| A) | Operational amplifier |
| B) | 555 timer |
| C) | LM 340 |
| D) | 741 |
5. A mass of metal attached to the case of a transistor to allow the heat to escape more easily.
| A) | Photodiode |
| B) | Flag |
| C) | Heat sink |
| D) | Op-amp |
6. In the standard letter-number identification code of operational amplifiers, the letter prefix which normally consists of two or three letters identifies the
| A) | Type of op-amp |
| B) | Temperature range of operation |
| C) | Type of packaging |
| D) | Manufacturer |
7. What is VCO
| A) | All of the answers |
| B) | Exhibits a frequency that can be varied with a dc control voltage |
| C) | A single pole low pass filter |
| D) | Is the terminal of the op-amp where input resistors are placed |
8. For a constant input voltage to an integrator, why is the voltage across the capacitor linear?
| A) | Capacitor current is linear |
| B) | Capacitor diode does not dissipate heat |
| C) | Capacitor current is constantly changing |
| D) | Capacitor current is constant |
9. A type of ground that appears at the inverting input of an op-amp that uses negative feedback.
| A) | Equipment ground |
| B) | Virtual ground |
| C) | Earth ground |
| D) | True ground |
10. The unwanted capacitance between connecting wires and ground.
| A) | Feedback capacitance |
| B) | Summer capacitor |
| C) | Biasing capacitance |
| D) | Stray wiring capacitance |
11. An op-amp circuit that has its output tied directly to the inverting input terminal is called a
| A) | Non-inverting amplifier |
| B) | Voltage follower |
| C) | Inverting amplifier |
| D) | Current follower |
12. Which of the following is not part of the three temperature range codes of op amps for commercial, industrial and military applications?
| A) | 0 to 70 ºC |
| B) | -30 to 200ºC |
| C) | -55 to 125 ºC |
| D) | -25 to 85 ºC |
13. Which of the following IC processes digital signals?
| A) | Monolithic IC |
| B) | Linear IC |
| C) | Digital IC |
| D) | Discrete IC |
14. What is the typical total power dissipated by the operational amplifier?
| A) | 500 mW |
| B) | 5 mW |
| C) | 50 mW |
| D) | 0.5 mW |
15. Which of the item below is an advantage of a shunt regulator over a series type?
| A) | A non regulating device |
| B) | Has an inherent current limiting |
| C) | Efficient than series regulator because of its component used |
| D) | None of the answers |
16. What is a complete electronic circuit, containing transistors, diodes, resistors and capacitors processed on and contained entirely within a single chip of silicon?
| A) | Monolithic IC |
| B) | Integrated circuit (IC) |
| C) | Digital IC |
| D) | Linear IC |
17. In IC op-amps, the input bias current is defined as the
| A) | Average of the two base currents |
| B) | Inverse of the base currents |
| C) | Difference of the base currents |
| D) | Total of the base currents |
18. The typical dimension of a BJT in a single IC chip is
| A) | 1.5 mils x 3 mils |
| B) | 4 mils x 6.5 mils |
| C) | 3 mils x 4.5 mils |
| D) | 2 mils x 12 mils |
19. The reason why integrated circuits are divided into digital linear categories is because
| A) | They either process analog or digital signals |
| B) | Up to the present these are the only two known categories |
| C) | They are simply circuits that happen to be constructed integrally and like all circuits are either switching type or amplifying type |
| D) | They are either used as input of output components |
20. The amplifier CMRR of µA 741 op-amplifier is
| A) | 80 dB |
| B) | 90 dB |
| C) | 70 dB |
| D) | 60 dB |
21. What is the specific application of µA741C op-amp
| A) | For commercial |
| B) | For industrial |
| C) | For military |
| D) | For experimental |
22. To convert a summing amplifier of an averaging amplifier
| A) | The ratio of Rf/R must equal to the reciprocal of the number of inputs |
| B) | All inputs must be of the same value |
| C) | All input resistors must be of different value |
| D) | The ratio of Rf/R must equal to the number of inputs |
23. The term monolithic is derived tom a combination of the Greek words monos and lithos which means
| A) | Single-stone |
| B) | Single-element |
| C) | Single-water |
| D) | Single-chip |
24. For most commercial and industrial operations, ICs are tested in the temperature range of
| A) | -10 ºC to + 25 ºC |
| B) | -55 ºC to +125 ºC |
| C) | -173 ºC to + 100 ºC |
| D) | 0ºC to +70 ºC |
25. A device that contains its own transistors, resistors, and diodes
| A) | Logic gates |
| B) | CMOS |
| C) | All of the answers |
| D) | Integrated circuit |
26. The absolute maximum rating for op-amps interval power dissipation is
| A) | 500 mW |
| B) | 200 mW |
| C) | 100 mW |
| D) | 300 mW |
27. CMRR means
| A) | The ratio of the differential voltage gain to common-mode voltage gain |
| B) | Common-mode rejection ratio |
| C) | The difference between the two base voltages |
| D) | Both Common-mode rejection ratio and The ratio of the differential voltage gain to common-mode voltage gain |
28. An integrator op-amp uses what element in the feedback path?
| A) | Resistor |
| B) | Capacitor |
| C) | Inductor |
| D) | Transistor |
29. ICs for military and space applications are tested in the temperature range of
| A) | -55 ºC to +125 ºC |
| B) | -10 ºC to + 25 ºC |
| C) | 0ºC to +70 ºC |
| D) | -173 ºC to + 100 ºC |
30. After assembly, the ICs are tested and classified as either
| A) | Industrial |
| B) | Military or industrial |
| C) | Military and industrial |
| D) | Military |
31. The unity gain frequency of an op-amp
| A) | It equals the gain bandwidth product |
| B) | Indicates the highest usable frequency |
| C) | Is the frequency where the voltage gain of an op-amp is 1 |
| D) | All of the answers |
32. What is the summing point in op-amps?
| A) | Acts as a scaling differentiator |
| B) | Determines the rate of change of the integrator output voltage |
| C) | A terminal of the op-amp where the input resistors are commonly connected |
| D) | Simulates mathematical integration |
33. What is the approximate short circuit current output of 741 op-amp?
| A) | 30 mA |
| B) | 35 mA |
| C) | 25 mA |
| D) | 15 mA |
34. The integrated circuit was invented at Texas instrument in 1958 by
| A) | Harold Lanche |
| B) | Jonathan Kurtz |
| C) | James Faug |
| D) | Jack Kilby |
35. Most linear ICs are low-power devices with power dissipation ratings of
| A) | Less than 1 W |
| B) | 5 W |
| C) | More than 1 W but less than 2 W |
| D) | 1 µW |
36. What is the typical input bias current of a 741 operational amplifier?
| A) | 80 nA |
| B) | 100 nA |
| C) | 90 nA |
| D) | 70 nA |
37. Which integrated circuit is having more than 1000 gates?
| A) | Large-scale integration (LSI) |
| B) | Medium-scale integration (MSI) |
| C) | Small-scale integration (SSI) |
| D) | Very large-scale integration (VLSI) |
38. Which integrated circuit is having 10 to 100 gates?
| A) | Large-scale integration (LSI) |
| B) | Medium-scale integration (MSI) |
| C) | Small-scale integration (SSI) |
| D) | Very large-scale integration (VLSI) |
39. The summing amplifier has two or more inputs, and its output voltage is proportional to the ____ of the algebraic sum of its input voltages.
| A) | Positive |
| B) | Negative |
| C) | Reciprocal |
| D) | Inverse |
40. A technique used to eliminate the need for inductive elements in monolithic integrated circuits.
| A) | RC synthesis |
| B) | Photolithographic |
| C) | LC synthesis |
| D) | Projection printing |
41. The typical dimension of a MOSFET in a single IC ship is
| A) | 4 mils x 6.5 mils |
| B) | 2 mils x 12 mils |
| C) | 3 mils x 4.5 mils |
| D) | 1.5 mils x 3 mils |
42. A base circuit that a designer can modify to get more advanced circuits
| A) | Peak detector |
| B) | Experimental |
| C) | Loading |
| D) | Prototype |
43. Which of the following IC processes analog signals?
| A) | Monolithic IC |
| B) | Digital IC |
| C) | Discrete IC |
| D) | Linear IC |
44. Astable multivibrator is
| A) | A square wave clock |
| B) | Equivalent to a flip-flop |
| C) | A one-shot multivibrator |
| D) | Monostable in nature |
45. What is the typical input resistance of the op-amp amplifier when measured under open loop?
| A) | 2.5 MΩ |
| B) | 1.5 MΩ |
| C) | 2 MΩ |
| D) | 3 MΩ |
46. The gain reduction in operational amplifier is known as
| A) | Gain-off |
| B) | Attenuation |
| C) | Roll-off |
| D) | Back-off |
47. What is the letter prefix used by the Fairchild Semiconductor on their op-amp product?
| A) | NE |
| B) | FS |
| C) | µA |
| D) | SG |
48. An integrated circuit for both astable and monostable applications
| A) | 555 timer |
| B) | Monolithic ICs |
| C) | Discrete ICs |
| D) | 741 op-amp |
49. The op-amp comparator circuit uses
| A) | A resistor |
| B) | No feedback |
| C) | Negative feedback |
| D) | Positive feedback |
50. Which integrated circuit is having more that 100 gates?
| A) | Very large-scale integration (VLSI) |
| B) | Large-scale integration (LSI) |
| C) | Small-scale integration (SSI) |
| D) | Medium-scale integration (MSI) |
51. In IC op-amps, one of the most important input characteristics is the _____ which is defined as the difference between the base currents.
| A) | Input offset current |
| B) | Total base current |
| C) | Input bias current |
| D) | All of the answers |
52. The ______ of an op amp is its voltage gain when there is no negative feedback
| A) | Close-loop |
| B) | Open-loop |
| C) | CMRR |
| D) | Unity gain |
53. ICs have advantages over discrete device circuits which is
| A) | All of the answers |
| B) | Lower cost |
| C) | High reliability |
| D) | Smaller size |
54. Plastic dual-in-line for insertion into sockets has a package suffix code of
| A) | P |
| B) | N |
| C) | J |
| D) | Both N and P |
55. The intel i486 32-bit microprocessor incorporates ______ transistors on a single chip.
| A) | 2 million |
| B) | 100 thousand |
| C) | 200 thousand |
| D) | 1 million |
56. What is the purpose of a comparator in op-amps?
| A) | To amplify an input voltage |
| B) | To maintain a constant output when the dc input voltage changes |
| C) | To detect the occurrence of a changing input voltage |
| D) | To produce change in output when an input voltage equals a reference voltage |
57. Which of the items below is equivalent to a relaxation oscillator?
| A) | Monostable multivibrator |
| B) | Astable multivibrator |
| C) | Bistable multivibrator |
| D) | Flip-flop |
58. What is the slew rate of a 741 operational amplifier?
| A) | 1 V/µs |
| B) | 0.5 V/µs |
| C) | 0.5 V/ms |
| D) | 1 V/ms |
59. What characteristic does not apply to an op-amp?
| A) | High gain |
| B) | High input impedance |
| C) | Low power |
| D) | Low output impedance |
60. MPP value in an op-amp is synonymous with
| A) | Output voltage swing |
| B) | The maximum unclipped peak-to-peak output of an amplifier |
| C) | All of the answers |
| D) | Equal to the difference of the two supply voltages |
61. The three most common package suffix codes are the following except one
| A) | A |
| B) | J |
| C) | D |
| D) | N |
62. What provides a parameter specifying the maximum rate of change of the output when driven by a large step-input signal?
| A) | Step rate |
| B) | Slew rate |
| C) | Dynamic rate |
| D) | Step rate |
63. Monolithic ICs are
| A) | Used for high power application |
| B) | Forms of discrete circuits |
| C) | Also called hybrid ICs |
| D) | Combination of thin-film and thick-film circuits |
64. In most modern IC op-amps, the 741 requires ______ power supplies
| A) | 1 |
| B) | 2 |
| C) | 3 |
| D) | 4 |
65. Microwave ICs cover the frequency range from
| A) | 0.5 to 15 GHz |
| B) | 30 to 45 GHz |
| C) | 45 to 100 GHz |
| D) | 15 to 30 GHz |
66. What is the most common method used for growth of single crystals for IC fabrication?
| A) | Epitaxial growth |
| B) | Czochralsky pulling technique |
| C) | Film deposition |
| D) | Photolithography |
67. What is the highest undistorted frequency out of an op-amp for a given slew rate and peak voltage?
| A) | 3-dB bandwidth |
| B) | Power bandwidth |
| C) | Cut-off frequency |
| D) | Critical frequency |
68. A circuit whose components are soldered or otherwise connected mechanically
| A) | Non discrete circuit |
| B) | Integrated circuit |
| C) | Discrete circuit |
| D) | Biasing circuit |
69. To use a comparator for zero-level detection, the inverting input is connected to
| A) | A negative reference voltage |
| B) | Ground |
| C) | The dc supply voltage |
| D) | A positive reference voltage |
70. The package suffix code for ceramic dual-in-line is
| A) | D |
| B) | N |
| C) | J |
| D) | P |
71. What identifies the package style that houses the op amp chip?
| A) | Military specification code |
| B) | Letter suffix |
| C) | Circuit designator |
| D) | Letter prefix |
72. The letter prefix LM identifies which of the following manufacturers?
| A) | Motorola |
| B) | Signetics |
| C) | National semiconductor corporation |
| D) | Texas instrument |
73. An oscillator is described by
| A) | No feedback |
| B) | An integrator or differentiator |
| C) | Regenerative feedback |
| D) | Unity gain and zero phase shift around the feedback loop |
74. A signal that is applied with equal strength to both inputs of a differential amplifier or an op-amp.
| A) | Common-emitter circuit |
| B) | Common mode signal |
| C) | Common-ration signal |
| D) | CMRR |
75. How is the output of a differentiator related to the input in an op-amp?
| A) | The output of a differentiator is proportional to the rate of change of the input |
| B) | The two parameters are not related |
| C) | The two parameters are always equal to each other |
| D) | The output of a differentiator is inversely proportional to the rate of change of the input |
76. What specification of an operational amplifier which tells how fast the output voltage can change?
| A) | Slew rate |
| B) | Open-loop voltage gain |
| C) | Frequency response |
| D) | Common mode rejection ration |
77. The charge-coupled device (CCD) is a unique and versatile semiconductor structure invented in 1969 by
| A) | H.H Strellrecht and C.S. Meyer |
| B) | W.S Boyle and G.E Smith |
| C) | D. Cave and W. Blood Jr. |
| D) | W.F Davis and R.C Huntington |
78. Integrated circuits having up to 9 gates is called
| A) | Small-scale integration (SSI) |
| B) | Medium-scale integration (MSI) |
| C) | Very large-scale integration (VLSI) |
| D) | Large-scale integration (LSI) |
79. What has been considered as the industry standard of linear ICs?
| A) | 555 timer |
| B) | 741 op amp |
| C) | LM 317 |
| D) | LM 340 |
80. Which component cannot be fabricated into ICs?
| A) | Transistor |
| B) | Diode |
| C) | Resistor |
| D) | Inductor |
81. What is the principal method used in the fabrication of semiconductor devices for hybrid and monolithic ICs?
| A) | Isolation diffusion |
| B) | Epitaxial growth |
| C) | Photolithographic process |
| D) | Planar technology |
82. A capacitor inside an op-amp that prevents oscillations
| A) | Limiting capacitor |
| B) | Coupling capacitor |
| C) | Biasing capacitor |
| D) | Compensating capacitor |
83. An IC op-amp that combines FETs and bipolar transistors.
| A) | IGFET |
| B) | MOSFET |
| C) | BIFET |
| D) | CMOS |
84. What is the most popular IC used in timing circuits?
| A) | LM 340 |
| B) | 741 |
| C) | 555 timer |
| D) | LM 317 |
85. When higher power ICs are needed, we can use
| A) | Monolithic ICs |
| B) | Thick film ICs |
| C) | Both Thin film ICs and Thick film ICs |
| D) | Thin film ICs |
86. Which of the choices below are sources of output offset voltage?
| A) | The difference in transistor voltage |
| B) | The difference in VBE values |
| C) | All of the answers |
| D) | The difference in VCE values |
87. The typical dimension of a diode in a single IC chip is
| A) | 2 mils x 12 mils |
| B) | 3 mils x 4.5 mils |
| C) | 1.5 mils x 3 mils |
| D) | 4 mils x 6.5 mils |
88. The rate of gain reduction in operational amplifers
| A) | 10 db per decade (-10db/decade) |
| B) | 6 db per decade (-6db/decade) |
| C) | 20 db per decade (-20db/decade) |
| D) | 5 db per decade (-5db/decade) |
89. In terms of circuit components, what does the term pole refer to?
| A) | A single RC circuit |
| B) | A cascaded amplifier |
| C) | A single RL circuit |
| D) | A summing amplifier |
90. In a 5 V level detector circuit
| A) | The input signal is connected to +5V |
| B) | The noninverting input is connected to +5V |
| C) | The input signal must be riding on a +5V dc level |
| D) | The inverting input is connected to +5V |
91. The voltage gain of differential amplifier
| A) | Is half of either collector current |
| B) | Equals the AC collector resistance divided by two times the AC resistance of the emitter diode |
| C) | Is the sum of two emitter currents |
| D) | Equals the difference between two base currents |
92. The value of the input voltage that switches the output of a comparator or Schmitt trigger
| A) | All of the answers |
| B) | Trip point |
| C) | Threshold voltage |
| D) | Firing voltage |
93. What is the absolute maximum rating for an op-amps differential input voltage?
| A) | ±50 V |
| B) | ±20 V |
| C) | ±10 V |
| D) | ±30 V |
94. Considered as the fundamental form of IC
| A) | VLSI |
| B) | Hybrid |
| C) | MSI |
| D) | Monolithic |
95. In an op-amp integrator, the feedback path consist of
| A) | A resistor and a capacitor in series |
| B) | A capacitor |
| C) | An inductor |
| D) | A resistor and a capacitor in parallel |
96. Most op-amps circuit use
| A) | Negative feedback |
| B) | Positive feedback |
| C) | Open-loop operation |
| D) | Closed-loop operation |
97. The maximum rate that an output voltage of an op-amp can change
| A) | CMRR |
| B) | Tail current |
| C) | Input offset voltage |
| D) | Slew rate |
98. What type of response characterizes the single pole low pass filter?
| A) | Current downward up to the maximum frequency |
| B) | Flat from dc to the critical frequency |
| C) | Curved upward to the maximum frequency |
| D) | No response characteristics |
99. What process is used to produce IC semiconductor elements?
| A) | Alloy junction |
| B) | Grown diffusion |
| C) | Planar diffusion |
| D) | Mesa diffusion |
100. Upon what principle does a relaxation oscillator operate?
| A) | Resistor in cascade |
| B) | Switching transistors |
| C) | The charging and discharging of capacitor |
| D) | The rectification process of a diode |
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