Electronic Devices and Circuits MCQs with answers Page - 18

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Admin • 833.24K Points
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Q. Ina common emitter amplifier, the capacitor from emitter to ground is called the

  • (A) coupling capacitor
  • (B) bypass capacitor
  • (C) decoupling capacitor
  • (D) tuning capacitor

A

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Q. A class A power amplifier uses transistor(s).

  • (A) two
  • (B) one
  • (C) three
  • (D) four

A

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Q. What is the maximum collector efficiency of a resistance loaded class A power amplifier?

  • (A) 50%
  • (B) 78.50%
  • (C) 25%
  • (D) 30%

A

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Q. Consider a zener diode with a slope resistance of 10 Ω in series with a 90 Ω resistor fed from a dc supply containing a ripple voltage of 20mV peak-to-peak. Compute for the ripple voltage in load

  • (A) 1 mv p-p
  • (B) 2 mv p-p
  • (C) 1 v p-p
  • (D) 6mv p-p

A

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Q. The of a common collector configuration is unity

  • (A) voltage gain
  • (B) current gain
  • (C) power gain
  • (D) input impedance

A

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Q. Transmit time is the time taken by the electrons on holes to pass from

  • (A) emitter to collector
  • (B) collector to emitter
  • (C) base to emitter
  • (D) base to collector

A

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Q. Which amplifier is commonly used as a frequency multiplier?

  • (A) class a
  • (B) class b
  • (C) class c
  • (D) all of the above

A

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Q. A class A amplifier has a voltage gain of 30 and a current gain of What is the power gain?

  • (A) 30
  • (B) 25
  • (C) 1.2
  • (D) 750

A

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Q. You have an application for a power amplifier to operate on FM radio frequencies. The most likely choice would be a amplifier.

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

A

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Q. A class A amplifier with RC = 3.3 kΩ and RE = 1.2 kΩ has a VCC = 20 V. Find IC(sat).

  • (A) 4.4 ma
  • (B) 6.1 ma
  • (C) 16.7 ma
  • (D) 20 ma

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