Electronic Devices and Circuits MCQs with answers Page - 10

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A

Admin • 833.24K Points
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Q. Which type of amplifier uses pulse (digital) signals in its operation?

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

A

Admin • 833.24K Points
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Q. Which of the power amplifiers has the lowest overall efficiency?

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

A

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Q. Which of the following describe(s) a power amplifier?

  • (A) it can handle large power.
  • (B) it can handle large current.
  • (C) it does not provide much voltage gain.
  • (D) all of the above

A

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Q. amplifiers primarily provide sufficient power to an output load to drive a speaker from a few watts to tens of watts.

  • (A) small-signal
  • (B) power
  • (C) none of the above
  • (D) all of the above

A

Admin • 833.24K Points
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Q. What is the ratio of the secondary voltage to the primary voltage with the turn ratio in the winding

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

A

Admin • 833.24K Points
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Q. Calculate the effective resistance seen looking into the primary of a 20:1 transformer connected to an 8- Ω load.

  • (A) 3.2 kΩ
  • (B) 3.0 kΩ
  • (C) 2.8 kΩ
  • (D) 1.8 kΩ

A

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Q. What transformer turns ratio is required to match an 8-speaker load so that the effective load resistance seen at the primary is 12.8 k?

  • (A) 20:01
  • (B) 40:01:00
  • (C) 50:01:00
  • (D) 60:01:00

A

Admin • 833.24K Points
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Q. Calculate the efficiency of a transformer-coupled class A amplifier for a supply of 15 V and an output of V(p) = 10 V.

  • (A) 25%
  • (B) 33.30%
  • (C) 50%
  • (D) 78.50%

A

Admin • 833.24K Points
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Q. The maximum efficiency of a transformer-coupled class A amplifier is .

  • (A) 25%
  • (B) 50%
  • (C) 78.5%
  • (D) 63.6%

A

Admin • 833.24K Points
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Q. How many transistors must be used in a class B power amplifier to obtain the output for the full cycle of the signal?

  • (A) 0
  • (B) 1
  • (C) 2
  • (D) 3

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