Electronic Devices and Circuits MCQs with answers Page - 51

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A

Admin • 833.24K Points
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Q. The operation of a JFET involves a flow of ?

  • (A) Recombination carriers
  • (B) Majority carriers
  • (C) Minority carriers
  • (D) Any of the above

A

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Q. For holding the drain current constant inspite of large changes in JFET parameters ?

  • (A) Current source bias is used
  • (B) Reverse bias is used
  • (C) Voltage divider bias is used
  • (D) No bias is used

A

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Q. When an input signal reduces the channel size, the process is called ?

  • (A) enhancement
  • (B) substrate connecting
  • (C) gate charge
  • (D) depletion

A

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Q. In a JFET, gates are always ?

  • (A) Unbiased
  • (B) Reverse biased
  • (C) Either forward or reverse biased
  • (D) Forward biased

A

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Q. How will electrons flow through a p-channel JFET ?

  • (A) from source to drain
  • (B) from source to gate
  • (C) from drain to gate
  • (D) from drain to source

A

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Q. In an n-channel JFET, what will happen at the pinch-off voltage ?

  • (A) the value of VDS at which further increases in VDS will cause no further increase in ID
  • (B) the value of VGS at which further decreases in VGS will cause no further increases in ID
  • (C) the value of VDG at which further decreases in VDG will cause no further increases in ID
  • (D) the value of VDS at which further increases in VGS will cause no further increases in ID

A

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Q. For an n-channel FET, What is the direction of current flow ?

  • (A) Source to drain
  • (B) Drain to source
  • (C) Gate to source
  • (D) Gate to drain

A

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Q. When applied input voltage varies the resistance of a channel, the result is called ?

  • (A) saturization
  • (B) polarization
  • (C) cut-off
  • (D) field effect

A

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Q. The main disadvantage of a JFET is ?

  • (A) Low gain-band width product
  • (B) Low gain
  • (C) High cost
  • (D) High noise level

A

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Q. What is the input impedance of a common-gate configured JFET ?

  • (A) very low
  • (B) low
  • (C) high
  • (D) very high

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