Electronic Devices and Circuits MCQs with answers Page - 15

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A

Admin • 833.24K Points
Coach

Q. amplifiers have the highest overall efficiency.

  • (A) class a
  • (B) class b or ab
  • (C) class c
  • (D) class d

A

Admin • 833.24K Points
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Q. Class D operation can achieve power efficiency of over .

  • (A) 90%
  • (B) 78.50%
  • (C) 50%
  • (D) 25%

A

Admin • 833.24K Points
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Q. The beta of a power transistor is generally .

  • (A) more than 200
  • (B) 100 to 200
  • (C) less than 100
  • (D) 0

A

Admin • 833.24K Points
Coach

Q. A form of class A amplifier having maximum efficiency of _ uses a transformer to couple the output signal to the load.

  • (A) 90%
  • (B) 78.50%
  • (C) 50%
  • (D) 25%

A

Admin • 833.24K Points
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Q. The reflected impedance seen from one side of the transformer to the other side is .

  • (A) n1/n2
  • (B) (n1/n2)2
  • (C) (n1/n2)1/3
  • (D) n1× n2

A

Admin • 833.24K Points
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Q. In a class A transformer-coupled power amplifier, winding resistance of the transformer determine(s) the dc load line for the circuit.

  • (A) the ac
  • (B) the dc
  • (C) both the ac and dc
  • (D) neither the ac nor dc

A

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Q. The slope of the ac load line in the class A transformer-coupled transistor is .

  • (A) –1/rl (load resistor)
  • (B) 1/(a2rl)
  • (C) –1/(a2rl)
  • (D) 1/rl

A

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Q. A class A amplifier dissipates power when the load is drawing maximum power from the circuit.

  • (A) the least
  • (B) about the same
  • (C) the most
  • (D) none of the above

A

Admin • 833.24K Points
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Q. At zero signal condition, a transistor sees load.

  • (A) dc
  • (B) ac
  • (C) both dc and ac
  • (D) resistive

A

Admin • 833.24K Points
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Q. What is the gain of an amplifier with negative feedback if the feedback factor is 0.01?

  • (A) 10
  • (B) 1000
  • (C) 100
  • (D) 500

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