Electronic Devices and Circuits MCQs with answers Page - 36

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Q. Beta ? is the symbol of current gain for ?

  • (A) Common-base mode
  • (B) Common-emitter mode
  • (C) Common-collector mode
  • (D) None of the above

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Q. In an NPN transistor with normal bias ?

  • (A) Only holes cross the collector junction
  • (B) Only the majority carries cross the collection junction
  • (C) The emitter junction has a high resistance
  • (D) The emitter junction is forward biased and collector junction is reverse biased

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Q. The current Iceo ?

  • (A) The emitter current in the CC connected transistor with zero base current
  • (B) The collector current in CE connected transistor with zero emitter current
  • (C) The collector current in the CE connected transistor with zero base current
  • (D) Same as ICBO

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Q. In a bipolar transistor at room temperature, if the emitter current across its base emitter junction: ?

  • (A) Doubles
  • (B) Halves
  • (C) Increases by 20 mV
  • (D) No change occurs

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Q. Emitter of transistor is doped ?

  • (A) Heavily
  • (B) Lightly
  • (C) Moderately
  • (D) None of these

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Q. The beta of transistor maybe determined directly from the curve plotted between ?

  • (A) VCE and IC for constant IB
  • (B) VCE and IC for constant IE
  • (C) VCE and IE for constant IB
  • (D) VBE and IE for constant VCE

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Q. The modulation of effective base width by collector voltage is known as Early Effect; hence reverse collector voltage ?

  • (A) Increases both ? and ?
  • (B) Decreases both ? and ?
  • (C) Increases ? but decreases ?
  • (D) Decreases ? but increases ?

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Q. The barrier potential across each silicon depletion layer is ?

  • (A) 0 V
  • (B) 0.3 V
  • (C) 0.7 V
  • (D) 1 V

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Q. Magnitude of ? is ?

  • (A) < 1
  • (B) > 1
  • (C) < 0
  • (D) None of the above

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Q. When a junction transistor is operated under saturated conditions ?

  • (A) Both the CB and EB junction are forward-biased
  • (B) The CB junction is forward-biased but the EB junction is reverse biased
  • (C) The CB junction is reverse-biased but the EB junction is forward-biased
  • (D) None of the above

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