Top 250+ Solved Electronic Devices and Circuits MCQ Questions Answer

From 136 to 150 of 268

Q. The input impedance of the base of an emitter follower is usually

a. low

b. high

c. shorted to ground

d. open

  • b. high

Q. 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

  • d. emitter diode and external ac emitter resistance

Q. 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

  • c. load resistor

Q. 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

  • c. two inputs and one output

Q. 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

  • d. the difference of the two input voltages

Q. 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

  • c. output capacitance of the load gates

Q. Which transistor element is used in CMOS logic?

a. fet

b. mosfet

c. bipolar

d. unijunction

  • b. mosfet

Q. A Darlington pair is used for

a. low distortion

b. high frequency range

c. high power gain

d. high current gain

  • d. high current gain

Q. 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

  • b. increase in the voltage gain and reduction in the bandwidth

Q. 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

  • a. an open-collector ttl gate

Q. 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

  • b. sum of individual gains

Q. 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

  • c. ability to provide impedance matching between stages

Q. A transformer coupled amplifier would give

a. maximum voltage gain

b. impedance matching

c. maximum current gain

d. larger bandwidth

  • b. impedance matching

Q. 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

  • d. increase the input resistance
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