MCQOPTIONS
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MCQOPTIONS
This section includes 158 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Which of the following is a bilateral element ? |
| A. | constant current source |
| B. | constant voltage source |
| C. | capacitance |
| D. | none of the above |
| Answer» D. none of the above | |
| 52. |
Which of the following is the passive element ? |
| A. | capacitance |
| B. | ideal current source |
| C. | ideal voltage source |
| D. | all of the above |
| Answer» B. ideal current source | |
| 53. |
A terminal where three on more branches meet is known as |
| A. | node |
| B. | terminus |
| C. | combination |
| D. | anode |
| Answer» B. terminus | |
| 54. |
Between the branch voltages of a loop the Kirchhoff s voltage law imposes |
| A. | non-linear constraints |
| B. | linear constraints |
| C. | no constraints |
| D. | none of the above |
| Answer» C. no constraints | |
| 55. |
Mill man’s theorem yields |
| A. | equivalent resistance |
| B. | equivalent impedance |
| C. | equivalent voltage source |
| D. | equivalent voltage or current source |
| Answer» E. | |
| 56. |
Application of Norton's theorem to a circuit yields |
| A. | equivalent current source and impedance in series |
| B. | equivalent current source and impedance in parallel |
| C. | equivalent impedance |
| D. | equivalent current source |
| Answer» B. equivalent current source and impedance in parallel | |
| 57. |
The superposition theorem is applicable to |
| A. | linear, non-linear and time variant responses |
| B. | linear and non- linear resistors only |
| C. | linear responses only |
| D. | none of the above |
| Answer» D. none of the above | |
| 58. |
A network which contains one or more than one source of e.m.f. is known as |
| A. | linear network |
| B. | non-linear network |
| C. | passive network |
| D. | active network |
| Answer» D. active network | |
| 59. |
An ideal voltage source has |
| A. | zero internal resistance |
| B. | open circuit voltage equal to the voltage on full load |
| C. | terminal voltage in proportion to current |
| D. | terminal voltage in proportion to load |
| Answer» B. open circuit voltage equal to the voltage on full load | |
| 60. |
A non-linear network does not satisfy |
| A. | superposition condition |
| B. | homogeneity condition |
| C. | both homogeneity as well as superposition condition |
| D. | homogeneity, superposition and associative condition |
| Answer» D. homogeneity, superposition and associative condition | |
| 61. |
If the energy is supplied from a source, whose resistance is 1 ohm, to a load of 100 ohms the source will be |
| A. | a voltage source |
| B. | a current source |
| C. | both of above |
| D. | none of the above |
| Answer» B. a current source | |
| 62. |
For maximum transfer of power, internal resistance of the source should be |
| A. | equal to load resistance |
| B. | less than the load resistance |
| C. | greater than the load resistance |
| D. | none of the above |
| Answer» B. less than the load resistance | |
| 63. |
Efficiency of power transfer when maximum transfer of power c |
| A. | 100% |
| B. | 80% |
| C. | 75% |
| D. | 50% |
| Answer» E. | |
| 64. |
For high efficiency of transfer of power, internal resistance of the source should be |
| A. | equal to the load resistance |
| B. | less than the load resistance |
| C. | more than the load resistance |
| D. | none of the above |
| Answer» C. more than the load resistance | |
| 65. |
The resistance LM will be |
| A. | 6.66 q |
| B. | 12 q |
| C. | 18q |
| D. | 20q |
| Answer» B. 12 q | |
| 66. |
"In any network containing more than one sources of e.m.f. the current in any branch is the algebraic sum of a number of individual fictitious currents (the number being equal to the number of sources of e.m.f.), each of which is due to separate action of each source of e.m.f., taken in order, when the remaining sources of e.m.f. are replaced by conductors, the resistances of which are equal to the internal resistances of the respective sources". The above statement is associated with |
| A. | thevenin\s theorem |
| B. | norton\s theorem |
| C. | superposition theorem |
| D. | none of the above |
| Answer» D. none of the above | |
| 67. |
"In any linear bilateral network, if a source of e.m.f. E in any branch produces a current I in any other branch, then same e.m.f. acting in the second branch would produce the same current / in the first branch". The above statement is associated with |
| A. | compensation theorem |
| B. | superposition theorem |
| C. | reciprocity theorem |
| D. | none of the above |
| Answer» D. none of the above | |
| 68. |
Kirchhoff s law is not applicable to circuits with |
| A. | lumped parameters |
| B. | passive elements |
| C. | distributed parameters |
| D. | non-linear resistances |
| Answer» D. non-linear resistances | |
| 69. |
A capacitor is generally a |
| A. | bilateral and active |
| B. | active, passive, |
| C. | linear and bilateral |
| D. | non-linear and |
| Answer» D. non-linear and | |
| 70. |
Kirchhoff s law is applicable to |
| A. | passive networks only |
| B. | a.c. circuits only |
| C. | d.c. circuits only |
| D. | both a.c. as well d.c. circuits |
| Answer» E. | |
| 71. |
Bootstrapping is used in emitter follower configurations to |
| A. | stabilize the voltage gain against process variations |
| B. | increase current gain |
| C. | reduce the output resistance |
| D. | increase the input resistance |
| Answer» E. | |
| 72. |
A transformer coupled amplifier would give |
| A. | maximum voltage gain |
| B. | impedance matching |
| C. | maximum current gain |
| D. | larger bandwidth |
| Answer» C. maximum current gain | |
| 73. |
One of the advantages of a Darlington pair is that it has enormous                          transformation capacity. |
| A. | voltage |
| B. | current |
| C. | impedance |
| D. | power |
| Answer» D. power | |
| 74. |
The most desirable feature of transformer coupling is its |
| A. | higher voltage gain |
| B. | wide frequency range |
| C. | ability to provide impedance matching between stages |
| D. | ability to eliminate hum from the output |
| Answer» D. ability to eliminate hum from the output | |
| 75. |
The decibel gain of a cascaded amplifier equals to |
| A. | product of individual gains |
| B. | sum of individual gains |
| C. | ration of stage gains |
| D. | product of voltage and current gains |
| Answer» C. ration of stage gains | |
| 76. |
An open-drain gate is the CMOS counterpart of . |
| A. | an open-collector ttl gate |
| B. | a tristate ttl gate |
| C. | a bipolar junction transistor |
| D. | an emitter- coupled logic gate |
| Answer» B. a tristate ttl gate | |
| 77. |
What is the effect of cascading amplifier stages? |
| A. | increase in the voltage gain and increase in the bandwidth |
| B. | increase in the voltage gain and reduction in the bandwidth |
| C. | decrease in the voltage gain and increase in the bandwidth |
| D. | increase in the voltage gain and reduction in the bandwidth |
| Answer» C. decrease in the voltage gain and increase in the bandwidth | |
| 78. |
A Darlington pair is used for |
| A. | low distortion |
| B. | high frequency range |
| C. | high power gain |
| D. | high current gain |
| Answer» E. | |
| 79. |
The differential amplifier has |
| A. | one input and one output |
| B. | two inputs and two outputs |
| C. | two inputs and one output |
| D. | one input and two outputs |
| Answer» D. one input and two outputs | |
| 80. |
The differential amplifier produces outputs that are |
| A. | common mode |
| B. | in-phase with the input voltages |
| C. | the sum of the two input voltages |
| D. | the difference of the two input voltages |
| Answer» E. | |
| 81. |
An emitter follower has a voltage gain that is |
| A. | much less than one |
| B. | approximately equal to one |
| C. | greater than one |
| D. | zero |
| Answer» C. greater than one | |
| 82. |
The output transformer used in a power amplifier is a/an                transformer |
| A. | 1:1 ratio |
| B. | step-down |
| C. | step-up |
| D. | isolation |
| Answer» C. step-up | |
| 83. |
A complementary-symmetry amplifier has |
| A. | one pnp and one npn transistor |
| B. | two pnp transistors |
| C. | two npn transistors |
| D. | two pnp and two npn transistors |
| Answer» B. two pnp transistors | |
| 84. |
The push-pull circuit must use operation. |
| A. | class a |
| B. | class b |
| C. | class c |
| D. | class ab |
| Answer» C. class c | |
| 85. |
Comparatively, power amplifier has β. |
| A. | large |
| B. | very large |
| C. | small |
| D. | very small |
| Answer» D. very small | |
| 86. |
Class C amplifiers are used as |
| A. | af amplifiers |
| B. | small signal amplifiers |
| C. | rf amplifiers |
| D. | if amplifiers |
| Answer» D. if amplifiers | |
| 87. |
What is the maximum collector efficiency of a resistance loaded class A power amplifier? |
| A. | 50% |
| B. | 78.50% |
| C. | 25% |
| D. | 30% |
| Answer» D. 30% | |
| 88. |
A class A power amplifier uses transistor(s). |
| A. | two |
| B. | one |
| C. | three |
| D. | four |
| Answer» C. three | |
| 89. |
What is the maximum collector efficiency of a transformer coupled class A power amplifier? |
| A. | 30% |
| B. | 80% |
| C. | 45% |
| D. | 50% |
| Answer» E. | |
| 90. |
Which of the following is the other name of the output stage in an amplifier? |
| A. | load stage |
| B. | audio stage |
| C. | power stage |
| D. | rf stage |
| Answer» D. rf stage | |
| 91. |
CC configuration is used for impedance matching because its |
| A. | input impedance is very high |
| B. | input impedance is very low |
| C. | output impedance is very low |
| D. | output impedance is zero |
| Answer» B. input impedance is very low | |
| 92. |
Which of the item below does not describe a common emitter amplifier? |
| A. | high voltage gain |
| B. | high current gain |
| C. | very high power gain |
| D. | high input resistance |
| Answer» E. | |
| 93. |
For highest power gain, what configuration is used? |
| A. | cc |
| B. | cb |
| C. | ce |
| D. | cs |
| Answer» D. cs | |
| 94. |
When amplifiers are cascaded |
| A. | the gain of each amplifier is increased |
| B. | a lower supply voltage is required |
| C. | the overall gain is increased |
| D. | each amplifier has to work less |
| Answer» D. each amplifier has to work less | |
| 95. |
The capacitors are considered in the ac equivalent circuit of a transistor amplifier. |
| A. | open |
| B. | partially open |
| C. | short |
| D. | partially short |
| Answer» D. partially short | |
| 96. |
When a transistor amplifier feeds a load of low resistance, its voltage gain will be |
| A. | low |
| B. | very high |
| C. | high |
| D. | moderate |
| Answer» B. very high | |
| 97. |
The output power of a transistor amplifier is more than the input power due to additional power supplied by |
| A. | transistor |
| B. | collector supply |
| C. | emitter supply |
| D. | base supply |
| Answer» C. emitter supply | |
| 98. |
Calculate the ripples of the filter output if a dc and ac voltmeter is used and measures the output signal from a filter circuit of 25 VDC and 1.5 Vrms |
| A. | 5% |
| B. | 10% |
| C. | 50% |
| D. | 6% |
| Answer» E. | |
| 99. |
What is the ideal maximum voltage gain of a common collector amplifier? |
| A. | unity |
| B. | infinite |
| C. | indeterminate |
| D. | zero |
| Answer» B. infinite | |
| 100. |
The output signal of a common-collector amplifier is always |
| A. | larger than the input signal |
| B. | in phase with the input signal |
| C. | out of phase with the input signal |
| D. | exactly equal to the input signal |
| Answer» C. out of phase with the input signal | |