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MCQOPTIONS
This section includes 1017 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. |
The standard 74XX TTL IC family was originally developed in the |
| A. | 1970s. |
| B. | 1960s. |
| C. | 1950s. |
| D. | 1940s. |
| Answer» C. 1950s. | |
| 52. |
The quiescent current of a FET amplifier is |
| A. | ids |
| B. | id |
| C. | id |
| D. | id |
| Answer» D. id | |
| 53. |
A common-emitter amplifier has voltage gain, current gain, power gain, and input impedance. |
| A. | high, low, high, low |
| B. | high, high, high, low |
| C. | high, high, high, high |
| D. | low, low, low, high |
| Answer» C. high, high, high, high | |
| 54. |
amplifiers have the highest overall efficiency. |
| A. | class a |
| B. | class b or ab |
| C. | class c |
| D. | class d |
| Answer» E. | |
| 55. |
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 | |
| 56. |
The theorem is a way to determine the currents and voltages present in a circuit that has multiple sources. |
| A. | norton |
| B. | super position |
| C. | thevenin |
| D. | maximum power transfer |
| Answer» C. thevenin | |
| 57. |
The capacitor that produces an ac ground is called a |
| A. | bypass capacitor |
| B. | coupling capacitor |
| C. | dc open |
| D. | ac open |
| Answer» B. coupling capacitor | |
| 58. |
In class B power amplifiers, the output signal varies for of the cycle. |
| A. | 360º |
| B. | 180º |
| C. | between 180º and 360º |
| D. | less than 180º |
| Answer» C. between 180º and 360º | |
| 59. |
There are h- parameters of a transistor. |
| A. | two |
| B. | four |
| C. | three |
| D. | none of the above |
| Answer» C. three | |
| 60. |
Power amplifiers primarily provide sufficient power to an output load, typically from to . |
| A. | a few kw, tens of kw |
| B. | 500 w, 1 kw |
| C. | 100 w, 500 w |
| D. | a few w, tens of w |
| Answer» E. | |
| 61. |
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. | |
| 62. |
A form of class A amplifier having maximum efficiency of _ uses a transformer to couple the output signal to the load. |
| A. | 90% |
| B. | 78.50% |
| C. | 50% |
| D. | 25% |
| Answer» D. 25% | |
| 63. |
The current gain of an emitter follower is |
| A. | equal to 1 |
| B. | greater than 1 |
| C. | less than 1 |
| D. | zero |
| Answer» D. zero | |
| 64. |
A family of logic devices designed for extremely high speed applications is called |
| A. | nmos. |
| B. | ecl. |
| C. | pmos. |
| D. | ttl. |
| Answer» C. pmos. | |
| 65. |
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 | |
| 66. |
Class-C amplifiers are almost always |
| A. | transformer- coupled between stages |
| B. | operated at audio frequencies |
| C. | tuned rf amplifiers |
| D. | wideband |
| Answer» D. wideband | |
| 67. |
When the collector supply is 5V, then collector cut off voltage under dc condition is |
| A. | 20 v |
| B. | 10 v |
| C. | 2.5 v |
| D. | 5 v |
| Answer» E. | |
| 68. |
In a class A transformer-coupled power amplifier, winding resistance of the transformer determine(s) the dc load line for the circuit. |
| A. | the ac |
| B. | the dc |
| C. | both the ac and dc |
| D. | neither the ac nor dc |
| Answer» C. both the ac and dc | |
| 69. |
The abbreviated designator for a LOW output voltage is |
| A. | voh. |
| B. | vil. |
| C. | vol. |
| D. | vih. |
| Answer» D. vih. | |
| 70. |
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 | |
| 71. |
Class amplifiers are normally operated in a push-pull configuration in order to produce an output that is a replica of the input. |
| A. | a |
| B. | b |
| C. | c |
| D. | ab |
| Answer» E. | |
| 72. |
Calculate the harmonic distortion component for an output signal having fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V. |
| A. | 3.83% |
| B. | 38.3% |
| C. | 83.3% |
| D. | 8.33% |
| Answer» E. | |
| 73. |
"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 | |
| 74. |
The minimum output voltage recognized as a HIGH by a TTL gate is |
| A. | 0.8 v. |
| B. | 2.4 v. |
| C. | 5.0 v. |
| D. | 2.0 v. |
| Answer» C. 5.0 v. | |
| 75. |
amplifiers primarily provide sufficient power to an output load to drive a speaker from a few watts to tens of watts. |
| A. | small-signal |
| B. | power |
| C. | none of the above |
| D. | all of the above |
| Answer» C. none of the above | |
| 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. |
The maximum efficiency of a class B amplifier is percent. |
| A. | 50 |
| B. | 25 |
| C. | 70 |
| D. | 79 |
| Answer» E. | |
| 78. |
What is the device in a transistor oscillator? |
| A. | lc tank circuit |
| B. | biasing circuit |
| C. | transistor |
| D. | feedback circuit |
| Answer» D. feedback circuit | |
| 79. |
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 | |
| 80. |
A class A amplifier has a voltage gain of 30 and a current gain of What is the power gain? |
| A. | 30 |
| B. | 25 |
| C. | 1.2 |
| D. | 750 |
| Answer» E. | |
| 81. |
Class power amplifier has the highest collector efficiency |
| A. | c |
| B. | a |
| C. | b |
| D. | ab |
| Answer» D. ab | |
| 82. |
What is the gain of an amplifier with negative feedback if the feedback factor is 0.01? |
| A. | 10 |
| B. | 1000 |
| C. | 100 |
| D. | 500 |
| Answer» D. 500 | |
| 83. |
A FET consists of a |
| A. | source |
| B. | drain |
| C. | gate |
| D. | all the above |
| Answer» E. | |
| 84. |
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 | |
| 85. |
In a bypass circuit, the top of a capacitor is |
| A. | an open |
| B. | a short |
| C. | an ac ground |
| D. | a mechanical ground |
| Answer» D. a mechanical ground | |
| 86. |
The time it takes for an input signal to pass through internal circuitry and generate the appropriate output effect is known as |
| A. | propagation delay |
| B. | rise time |
| C. | fan-out |
| D. | fall time |
| Answer» B. rise time | |
| 87. |
For Class-B operation, the collector current flows for |
| A. | the whole cycle |
| B. | half the cycle |
| C. | less than half a cycle |
| D. | less than a quarter of a cycle |
| Answer» C. less than half a cycle | |
| 88. |
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 | |
| 89. |
The h- parameter approach gives correct results for |
| A. | large signals only |
| B. | small signals only |
| C. | both small and large signals |
| D. | none of the above |
| Answer» C. both small and large signals | |
| 90. |
Kirchhoff's Voltage Law states that the total voltage around a closed loop must be |
| A. | 0 |
| B. | ½ |
| C. | 1 |
| D. | 2 |
| Answer» B. ½ | |
| 91. |
A current ratio of IC/IE is usually less than one and is called |
| A. | omega |
| B. | beta |
| C. | theta |
| D. | alpha |
| Answer» E. | |
| 92. |
The input transistor on a TTL circuit is unusual in that it has |
| A. | multiple bases. |
| B. | no collector. |
| C. | no base. |
| D. | multiple emitters. |
| Answer» E. | |
| 93. |
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% | |
| 94. |
Node analysis can be applied for |
| A. | planar networks |
| B. | non-planar networks |
| C. | both a & b |
| D. | electric networks |
| Answer» D. electric networks | |
| 95. |
Superposition theorem is based on |
| A. | reciprocity |
| B. | duality |
| C. | non-linearity |
| D. | linearity |
| Answer» E. | |
| 96. |
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 | |
| 97. |
The maximum current for a LOW output on a standard TTL gate is |
| A. | 16 µa. |
| B. | 40 ma. |
| C. | 100 µa. |
| D. | 16 ma. |
| Answer» E. | |
| 98. |
The class amplifier is biased below cutoff. |
| A. | a |
| B. | ab |
| C. | b |
| D. | c |
| Answer» D. c | |
| 99. |
Efficiency of power transfer when maximum transfer of power c |
| A. | 100% |
| B. | 80% |
| C. | 75% |
| D. | 50% |
| Answer» E. | |
| 100. |
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 | |