Electronic Devices and Circuits MCQs with answers Page - 22

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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

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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

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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

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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

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Q. Which transistor element is used in CMOS logic?

  • (A) fet
  • (B) mosfet
  • (C) bipolar
  • (D) unijunction

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Q. A Darlington pair is used for

  • (A) low distortion
  • (B) high frequency range
  • (C) high power gain
  • (D) high current gain

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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

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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

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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

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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

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