Electronic Devices and Circuits MCQs with answers Page - 44

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Q. The C-B configuration is used to provide which type of gain ?

  • (A) voltage
  • (B) current
  • (C) resistance
  • (D) power

A

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Q. A transistor has how many doped regions ?

  • (A) 1
  • (B) 2
  • (C) 3
  • (D) 4

A

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Q. Three different Q points are shown on a dc load line. The upper Q point represents the ?

  • (A) minimum current gain
  • (B) intermediate current gain
  • (C) maximum current gain
  • (D) cutoff point

A

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Q. What is one important thing transistors do ?

  • (A) Amplify weak signals
  • (B) Rectify line voltage
  • (C) Regulate voltage
  • (D) Emit light

A

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Q. Which of the following is true for a pnp transistor in saturation region ?

  • (A) CB junction is reversed bias and the EB junction is forward bias
  • (B) CB junction is forward bias and the EB junction is forward bias
  • (C) CB junction is forward bias and the EB junction is reverse bias
  • (D) CB junction is reversed bias and the EB junction is reverse bias

A

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Q. A transistor has a (Beta)dc of 250 and a base current, Ib, of 20 microA. The collector current, equals ?

  • (A) 500 microA
  • (B) 5 mA
  • (C) 50 mA
  • (D) 5 A

A

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Q. Under normal reverse bias voltage applied to diode, the reverse current in Si diode ?

  • (A) 100 mA
  • (B) order of ?A
  • (C) 1000 ?A
  • (D) None of these

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Q. Avalanche breakdown in a diode occurs when ?

  • (A) Potential barrier is reduced to zero
  • (B) Forward current exceeds certain value
  • (C) Reverse bias exceeds a certain value
  • (D) None of these

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Q. Reverse saturation current in a Silicon PN junction diode nearly doubles for very ?

  • (A) 20 rise in temp
  • (B) 50 rise in temp
  • (C) 60 rise in temp
  • (D) 100 rise in temp

A

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Q. What diode operates only with majority carriers ?

  • (A) laser
  • (B) tunnel
  • (C) Schottky
  • (D) step-recovery

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