Electronic Devices and Circuits MCQs with answers Page - 35

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Q. A BJT is in the saturation region if ?

  • (A) Base emitter junction is reverse-biased and base-collector junction is forward-biased
  • (B) Both the junctions are reverse-biased
  • (C) Both the junctions are forward-biased
  • (D) Base-emitter junction is forward-biased and base-collector junction is reverse-biased

A

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Q. A transistor, when connected in CE mode, has ?

  • (A) Low input resistance and low output resistance
  • (B) High input resistance and high output resistance
  • (C) High input resistance and low output resistance
  • (D) A medium input resistance and high output resistance

A

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Q. If the base resistor is open, what is the collector current ?

  • (A) 0
  • (B) 1 mA
  • (C) 2 mA
  • (D) 10 Ma

A

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Q. In a normally biased NPN transistor, the electrons in the emitter have enough energy to overcome the barrier potential of the ?

  • (A) Base-emitter junction
  • (B) Base-collector junction
  • (C) Collector-base junction
  • (D) Recombination path

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Q. If a transistor operates at the middle of the load line, an increase in the base resistance will move the Q-point ?

  • (A) Down
  • (B) Up
  • (C) No where
  • (D) off the load line

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Q. ...... is the current that flows when some DC voltage is applied ?

  • (A) In the forward direction to the emitter junction with collector open
  • (B) In the reverse direction to the emitter Junction with collector open
  • (C) In the reverse direction to the collector Junction with emitter open
  • (D) Is the forward direction to the collector Junction with emitter open

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Q. The base of an NPN transistor is thin and ?

  • (A) Heavily doped
  • (B) Lightly doped
  • (C) Metallic
  • (D) Doped by a pentavalent material

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Q. As the temperature increases, the current gain ?

  • (A) Decreases
  • (B) Remains the same
  • (C) Increases
  • (D) Can be any of the above

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Q. What is the most important fact about the collector current ?

  • (A) It is measured in milliamperes
  • (B) It equals the base current divided by the current gain
  • (C) It is small
  • (D) It approximately equals the emitter current

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Q. The arrowhead on the transistor symbol points In the direction of ?

  • (A) Electrons flow in the emitter region
  • (B) Minority Carriers flow in the emitter region
  • (C) Majority carriers flow in the emitter region
  • (D) Conventional current flow in the emitter region

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