McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Electronics and Communication Engineering .
| 101. |
What is the maximum collector efficiency of a transformer coupled class A power amplifier? |
| A. | 30% |
| B. | 80% |
| C. | 45% |
| D. | 50% |
| Answer» D. 50% | |
| 102. |
Class C amplifiers are used as |
| A. | af amplifiers |
| B. | small signal amplifiers |
| C. | rf amplifiers |
| D. | if amplifiers |
| Answer» C. rf amplifiers | |
| 103. |
Find the voltage drop developed across a D’ Arsonval meter movement having an internal resistance of 1 kΩ and a full deflection current of 150uA. |
| A. | 150 µv |
| B. | 150 mv |
| C. | 150 v |
| D. | 200 mv |
| Answer» B. 150 mv | |
| 104. |
If the capacitor from emitter to ground in a common emitter amplifier is removed, the voltage gain |
| A. | increases |
| B. | decreases |
| C. | becomes erratic |
| D. | remains the same |
| Answer» B. decreases | |
| 105. |
Comparatively, power amplifier has β. |
| A. | large |
| B. | very large |
| C. | small |
| D. | very small |
| Answer» C. small | |
| 106. |
The driver stage usually employs amplifier. |
| A. | class a power |
| B. | class c |
| C. | push-pull |
| D. | class ab |
| Answer» A. class a power | |
| 107. |
The push-pull circuit must use operation. |
| A. | class a |
| B. | class b |
| C. | class c |
| D. | class ab |
| Answer» B. class b | |
| 108. |
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» A. one pnp and one npn transistor | |
| 109. |
Power amplifiers generally use transformer coupling because transformer coupling provides |
| A. | cooling of the circuit |
| B. | distortionless output |
| C. | impedance matching |
| D. | good frequency response |
| Answer» C. impedance matching | |
| 110. |
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» B. step-down | |
| 111. |
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» B. approximately equal to one | |
| 112. |
The input impedance of the base of an emitter follower is usually |
| A. | low |
| B. | high |
| C. | shorted to ground |
| D. | open |
| Answer» B. high | |
| 113. |
The ac base voltage of an emitter follower is across the |
| A. | emitter diode |
| B. | dc emitter resistor |
| C. | load resistor |
| D. | emitter diode and external ac emitter resistance |
| Answer» D. emitter diode and external ac emitter resistance | |
| 114. |
The output voltage of an emitter follower is across the |
| A. | emitter diode |
| B. | dc collector resistor |
| C. | load resistor |
| D. | emitter diode and external ac emitter resistance |
| Answer» C. load resistor | |
| 115. |
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» C. two inputs and one output | |
| 116. |
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» D. the difference of the two input voltages | |
| 117. |
Which factor does not affect CMOS loading? |
| A. | charging time associated with the output resistance of the driving gate |
| B. | discharging time associated with the output resistance of the driving gate |
| C. | output capacitance of the load gates |
| D. | input capacitance of the load gates |
| Answer» C. output capacitance of the load gates | |
| 118. |
Which transistor element is used in CMOS logic? |
| A. | fet |
| B. | mosfet |
| C. | bipolar |
| D. | unijunction |
| Answer» B. mosfet | |
| 119. |
A Darlington pair is used for |
| A. | low distortion |
| B. | high frequency range |
| C. | high power gain |
| D. | high current gain |
| Answer» D. high current gain | |
| 120. |
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» B. increase in the voltage gain and reduction in the bandwidth | |
| 121. |
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» A. an open-collector ttl gate | |
| 122. |
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» B. sum of individual gains | |
| 123. |
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» C. ability to provide impedance matching between stages | |
| 124. |
A transformer coupled amplifier would give |
| A. | maximum voltage gain |
| B. | impedance matching |
| C. | maximum current gain |
| D. | larger bandwidth |
| Answer» B. impedance matching | |
| 125. |
One of the advantages of a Darlington pair is that it has enormous transformation capacity. |
| A. | voltage |
| B. | current |
| C. | impedance |
| D. | power |
| Answer» C. impedance | |
| 126. |
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» D. increase the input resistance | |
| 127. |
To determine the polarity of the voltage drop across a resistor, it is necessary to know |
| A. | value of current through the resistor |
| B. | direction of current through the resistor |
| C. | value of resistor |
| D. | e.m.fs. in the circuit |
| Answer» B. direction of current through the resistor | |
| 128. |
"Maximum power output is obtained from a network when the load resistance is equal to the output resistance of the network as seen from the terminals of the load". The above statement is associated with |
| A. | mill man’s theorem |
| B. | thevenin\s theorem |
| C. | superposition theorem |
| D. | maximum power transfer theorem |
| Answer» D. maximum power transfer theorem | |
| 129. |
"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» C. reciprocity theorem | |
| 130. |
Which of the following is non-linear circuit parameter? |
| A. | inductance |
| B. | condenser |
| C. | wire wound resistor |
| D. | transistor |
| Answer» A. inductance | |
| 131. |
A capacitor is generally a |
| A. | bilateral and active |
| B. | active, passive, |
| C. | linear and bilateral |
| D. | non-linear and |
| Answer» C. linear and bilateral | |
| 132. |
"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» C. superposition theorem | |
| 133. |
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» D. both a.c. as well d.c. circuits | |
| 134. |
Kirchhoff s law is not applicable to circuits with |
| A. | lumped parameters |
| B. | passive elements |
| C. | distributed parameters |
| D. | non-linear resistances |
| Answer» C. distributed parameters | |
| 135. |
The resistance LM will be |
| A. | 6.66 q |
| B. | 12 q |
| C. | 18q |
| D. | 20q |
| Answer» A. 6.66 q | |
| 136. |
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» B. less than the load resistance | |
| 137. |
Efficiency of power transfer when maximum transfer of power c |
| A. | 100% |
| B. | 80% |
| C. | 75% |
| D. | 50% |
| Answer» D. 50% | |
| 138. |
If resistance across LM in Fig. 2.30 is 15 ohms, the value of R is |
| A. | 10 q |
| B. | 20 q |
| C. | 30 q |
| D. | 40 q |
| Answer» C. 30 q | |
| 139. |
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» A. equal to load resistance | |
| 140. |
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» A. a voltage source | |
| 141. |
The circuit whose properties are same in either direction is known as |
| A. | unilateral circuit |
| B. | bilateral circuit |
| C. | irreversible circuit |
| D. | reversible circuit |
| Answer» B. bilateral circuit | |
| 142. |
In a series parallel circuit, any two resistances in the same current path must be in |
| A. | series with each other |
| B. | parallel with each other |
| C. | series with the voltage source.\ |
| D. | parallel with the voltage source |
| Answer» A. series with each other | |
| 143. |
The circuit has resistors, capacitors and semi-conductor diodes. The circuit will be known as |
| A. | non-linear circuit |
| B. | linear circuit |
| C. | bilateral circuit |
| D. | none of the above |
| Answer» A. non-linear circuit | |
| 144. |
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» C. both homogeneity as well as superposition condition | |
| 145. |
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» A. zero internal resistance | |
| 146. |
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» C. passive network | |
| 147. |
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» C. linear responses only | |
| 148. |
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» A. equivalent current source and impedance in series | |
| 149. |
Mill man’s theorem yields |
| A. | equivalent resistance |
| B. | equivalent impedance |
| C. | equivalent voltage source |
| D. | equivalent voltage or current source |
| Answer» D. equivalent voltage or current source | |
| 150. |
The superposition theorem is applicable to |
| A. | voltage only |
| B. | current "only |
| C. | both current and voltage |
| D. | current voltage and power |
| Answer» D. current voltage and power | |
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