Electronic Devices and Circuits MCQs with answers Page - 4

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Q. A BJT has an IB of 50 µA and a βDC of 75; IC is:

  • (A) 375 ma
  • (B) 37.5 ma
  • (C) 3.75 ma
  • (D) 0.375 ma

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Q. A certain transistor has IC = 15 mA and IB = 167 µA; βDC is:

  • (A) 15
  • (B) 167
  • (C) 0.011
  • (D) 90

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Q. Class B operation is provided when the dc bias leaves the transistor biased just off, the transistor turning on when the ac signal is applied.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

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Q. Calculate the efficiency of a class B amplifier for a supply voltage of VCC = 20 V with peak output voltage of VL(p) = 18 V. Assume RL = 16 Ω.

  • (A) 78.54%
  • (B) 75%
  • (C) 70.69%
  • (D) 50%

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Q. Which of the following is (are) the disadvantage(s) of a class B complementary-symmetry circuit?

  • (A) it needs two separate voltage sources.
  • (B) there is crossover distortion in the output signal.
  • (C) it does not provide exact switching of one transistor off and the other on at the zero- voltage condition.
  • (D) all of the above

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Q. nMOS and pMOS transistors can be used for class B.

  • (A) true
  • (B) false
  • (C) ---
  • (D) ---

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Q. Calculate the harmonic distortion component for an output signal having fundamental amplitude of 3 V and a second harmonic amplitude of 0.25 V.

  • (A) 3.83%
  • (B) 38.3%
  • (C) 83.3%
  • (D) 8.33%

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Q. Which of the following instruments displays the harmonics of a distorted signal?

  • (A) digital multimeter
  • (B) spectrum analyzer
  • (C) oscilloscope
  • (D) wave analyzer

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Q. Which of the following instruments allows more precise measurement of the harmonic components of a distorted signal?

  • (A) digital multimeter
  • (B) spectrum analyzer
  • (C) oscilloscope
  • (D) wave analyzer

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Q. What is the maximum temperature rating for silicon power transistors?

  • (A) 50º to 80º
  • (B) 100º to 110º
  • (C) 150º to 200º
  • (D) 250º to 300º

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