Electronic Devices and Circuits MCQs with answers Page - 43

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Q. Most of the electrons in the base of an NPN transistor flow ?

  • (A) out of the base lead
  • (B) into the collector
  • (C) into the emitter
  • (D) into the base supply

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Q. If a transistor operates at the middle of the dc load line, a decrease in the current gain will move the Q point ?

  • (A) off the load line
  • (B) nowhere
  • (C) up
  • (D) down

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Q. The base current is 50 microamp If the current gain is 125, the collector current is closest in value to ?

  • (A) 40 microamp
  • (B) 500 microamp
  • (C) 1 mA
  • (D) 6 mA

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Q. In a transistor as an amplifier, the reverse saturation current ?

  • (A) Doubles for every rise in temperature
  • (B) Doubles for every 10°C rise in temperature
  • (C) Decreases linearly with temperature
  • (D) Increase linearly with temperature

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Q. If the current gain is 200 and the collector current is 100 mA, the base current is ?

  • (A) 0.5 mA
  • (B) 2 mA
  • (C) 2 A
  • (D) 20 A

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Q. In the active region, the collector current is not changed significantly by ?

  • (A) Base supply voltage
  • (B) Base current
  • (C) Current gain
  • (D) Collector resistance

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Q. Which is beta's current ratio ?

  • (A) Ic/Ib
  • (B) Ic/Ie
  • (C) Ib/Ie
  • (D) Ie/Ib

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Q. Which of the following is true for a pnp transistor in active 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

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Q. In an npn transistor, the majority carriers in the base are ?

  • (A) Free electrons
  • (B) Holes
  • (C) Neither
  • (D) Both

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Q. When transistors are used in digital circuits they usually operate in the ?

  • (A) active region
  • (B) breakdown region
  • (C) saturation and cutoff regions
  • (D) linear region

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