Electronic Devices and Circuits MCQs with answers Page - 5

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Q. Which of the power amplifiers is not intended primarily for large- signal or power amplification?

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

A

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Q. Determine what maximum dissipation will be allowed for a 70-W silicon transistor (rated at 25ºC) if derating is required above 25ºC by a derating factor of 0.6 W/ºC at a case temperature of 100º.

  • (A) 25 w
  • (B) 30 w
  • (C) 35 w
  • (D) 40 w

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Q. A silicon power transistor is operated with a heat sink (θSA = 1.5ºC/W). The transistor, rated at 150 W (25ºC), has θJC = 0.5º C/W, and the mounting insulation has θCS = 0.6 ºC/W. What is the maximum power that can be dissipated if the ambient temperature is 50ºC and TJmax = 200 ºC?

  • (A) 61.5 w
  • (B) 60.0 w
  • (C) 57.7 w
  • (D) 55.5 w

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Q. Which of the following transistors has been quite popular as the driver device for class D amplification?

  • (A) bjt
  • (B) fet
  • (C) ujt
  • (D) mosfet

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Q. The algebraic sum of in a network of conductors meeting at a point is zero.

  • (A) voltages
  • (B) currents
  • (C) resistances
  • (D) inductances

A

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Q. The theorem is a way to determine the currents and voltages present in a circuit that has multiple sources.

  • (A) norton
  • (B) super position
  • (C) thevenin
  • (D) maximum power transfer

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Q. The concept on which Superposition theorem is based is

  • (A) reciprocity
  • (B) duality
  • (C) non-linearity
  • (D) linearity

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Q. Kirchhoff’s current law is applicable to only

  • (A) junction in a network
  • (B) closed loops in a network
  • (C) electric circuits
  • (D) electronic circuits

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Q. Superposition theorem can be applied only to circuits having

  • (A) resistive elements
  • (B) passive elements
  • (C) non-linear elements
  • (D) linear bilateral elements

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Q. The concept on which superposition theorem is based on

  • (A) reciprocity
  • (B) duality
  • (C) non-linearity
  • (D) linearity

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