Analog Electronics MCQs with answers Page - 4

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Q. The action of JFET in its equivalent circuit can best be represented as a

  • (A) Current controlled Current source
  • (B) Current controlled voltage source
  • (C) Voltage controlled voltage source
  • (D) voltage controlled current source

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Q. Three identical amplifiers with each one having a voltage gain of 50, input resistance of 1KΩ & output resistance of 250 ,are cascade D. The open circuit voltage gain of combined amplifier is

  • (A) 49dB
  • (B) 51dB
  • (C) 98dB
  • (D) 102dB

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Q. An ideal OP-AMP is an ideal

  • (A) Current controlled Current source
  • (B) Current controlled voltage source
  • (C) Voltage controlled voltage source
  • (D) voltage controlled current source

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Q. In a full-wave rectifier using two ideal diodes,Vdc & Vm are the dc & peak values of the voltage respectively across a resistive loaD. If PIV is the peak inverse voltage of the diode, then the appropriate relationships for this rectifier is.

  • (A) Vdc = Vm/π, PIV=2Vm
  • (B) Vdc = 2Vm/π, PIV=2vm
  • (C) Vdc = 2Vm/π, PIV=Vm
  • (D) Vdc = Vm/π, PIV=Vm

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Q. The cascade amplifier is a multistage configuration of

  • (A) CC-CB.
  • (B) CE-CB
  • (C) CB-CC
  • (D) CE-CC

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Q. The current gain of a BJT is

  • (A) gm r0
  • (B) gm / r0
  • (C) gm rπ
  • (D) gm /rπ

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Q. The most commonly used amplifier in sample & hold circuits is

  • (A) A unity gain non-inverting amplifier
  • (B) A unity gain inverting amplifier
  • (C) An inverting amplifier with a gain of 10
  • (D) An inverting amplifiers with a gain of 100

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Q. To prevent a DC return between source and load, it is necessary to use

  • (A) resistor between source and load
  • (B) inductor between source and load
  • (C) capacitor between source and load
  • (D) either

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Q. Introducing a resistor in the emitter of a common amplifier stabilizes the dc operating point against variations in

  • (A) Only the temperature
  • (B) only the β of the transistor
  • (C) Both Temperature & β
  • (D) None of the above

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Q. Voltage Series feedback also called series-shunt feedback) results in

  • (A) Increase in both input & output impedances
  • (B) Decreases in both input & output impedances
  • (C) Increase in input impedance & decreases in output impedance
  • (D) Decrease in input impedance & increase in output impedance

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