Electronic Devices and Circuits MCQs with answers Page - 12

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Admin • 833.24K Points
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Q. The Bode plot is applicable to

  • (A) all phase network
  • (B) minimum phase network
  • (C) maximum phase network
  • (D) lag lead network

A

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Q. For any inverting amplifier, the impedance capacitance will be by a Miller effect capacitance sensitive to the gain of the amplifier and the interelectrode capacitance.

  • (A) unaffected
  • (B) increased
  • (C) decreased
  • (D) none of the above

A

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Q. The dc emitter current of a transistor is 8 mA. What is the value of re?

  • (A) 320 Ω
  • (B) 13.3 kΩ
  • (C) 3.125 Ω
  • (D) 5.75 Ω

A

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Q. An emitter-follower amplifier has an input impedance of 107 kΩ. The input signal is 12 mV. The approximate output voltage is (common-collector)

  • (A) 8.92 v
  • (B) 112 mv
  • (C) 12 mv
  • (D) 8.9 mv

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Q. You have a need to apply an amplifier with a very high power gain. Which of the following would you choose?

  • (A) common-collector
  • (B) common-base
  • (C) common-emitter
  • (D) emitter- follower

A

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Q. What is the most important r parameter for amplifier analysis?

  • (A) rb′
  • (B) rc′
  • (C) re′
  • (D) none of the above

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Q. 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

A

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Q. To analyze the common-emitter amplifier, what must be done to determine the dc equivalent circuit?

  • (A) leave circuit unchanged
  • (B) replace coupling and bypass capacitors with opens
  • (C) replace coupling and bypass capacitors with shorts
  • (D) replace vcc with ground

A

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Q. What is re equal to in terms of h parameters?

  • (A) hre / hoe
  • (B) (hre + 1) / hoe
  • (C) hie – (hre / hoe)(1 + hfe)
  • (D) hfe

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Q. The advantage that a Sziklai pair has over a Darlington pair is

  • (A) higher current gain.
  • (B) less input voltage is needed to turn it on.
  • (C) higher input impedance.
  • (D) higher voltage gain.

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