Electronic Devices and Circuits MCQs with answers Page - 37

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Q. When the current gain increases from 50 to 300 in an emitter-biased circuit, the collector current ?

  • (A) Remains almost the same
  • (B) Decreases by a factor of 6
  • (C) Increases by a factor of 6
  • (D) Is zero

A

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Q. Which configuration of bipolar transistors of similar geometry has the highest current gain, bandwidth product for ?

  • (A) n-p-n Ge transistor
  • (B) p-n-p Si transistor
  • (C) p-n-p Ge transistor
  • (D) n-p-n Si transistor

A

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Q. Base-to-emitter voltage is forward-biased transistor decreases with the increase of temperature at the following rate ?

  • (A) 2.5 mv/C
  • (B) 25 mv/C
  • (C) 0.25 mv/C
  • (D) 0.6 m/C

A

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Q. The Early Effect in a bipolar transistor is caused by ?

  • (A) Base width modulation
  • (B) Large collector-base reverse-bias
  • (C) Large emitter-base forward-bias
  • (D) Increase in junction temperature

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Q. The most commonly used transistor circuit arrangement is ?

  • (A) Common base
  • (B) Common emitter
  • (C) Common collector
  • (D) None of these

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Q. The emitter current in a Junction with normal bias ?

  • (A) Is almost equal to base current
  • (B) Is equal to the sum of IB and IC
  • (C) Changes greatly by small change in collector bias voltage
  • (D) Is equal to ICBO

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Q. The Silicon transistor are more widely used then Germanium transistor because ?

  • (A) They have smaller leakage current
  • (B) They have better ability to dissipate heat
  • (C) They have smaller depletion layers
  • (D) They have larger the current carrying capacity

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Q. The current Icbo flows in the ?

  • (A) Emitter and base leads
  • (B) Collector and base leads
  • (C) Emitter and collector leads
  • (D) None of these

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Q. If the emitter resistance decreases, the ?

  • (A) Q point moves up
  • (B) Collector current decreases
  • (C) Q point stays where it is
  • (D) Current gain increases

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Q. If the base resistor is very small, the transistor will operate in the ?

  • (A) Cut-off region
  • (B) Active region
  • (C) Saturation region
  • (D) Breakdown region

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