Electronic Devices and Circuits MCQs with answers Page - 30

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A

Admin • 833.24K Points
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Q. In the constant-current region, how will the IDS change in an n-channel JFET ?

  • (A) As VGS decreases ID decreases
  • (B) As VGS increases ID increases
  • (C) As VGS decreases ID remains constant
  • (D) As VGS increases ID remains constant

A

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Q. The common-source JFET amplifier has ?

  • (A) a very high input impedance and a relatively low voltage gain
  • (B) a high input impedance and a very high voltage gain
  • (C) a high input impedance and a voltage gain less than 1
  • (D) no voltage gain

A

Admin • 833.24K Points
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Q. For a FET when will maximum current flows ?

  • (A) Vgs = 0V
  • (B) Vgs = 0v and Vds >= |Vp|
  • (C) VDS >= |Vp|
  • (D) Vp = 0

A

Admin • 833.24K Points
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Q. When is a vertical channel E-MOSFET used ?

  • (A) for high frequencies
  • (B) for high voltages
  • (C) for high currents
  • (D) for high resistances

A

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Q. Which of the following is not the main characteristic of FET ?

  • (A) Amplification factor
  • (B) Forward transconductance
  • (C) Temperature factor
  • (D) None of the above

A

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Q. To use FET as a voltage controlled resistor, in which region it should operate ?

  • (A) Ohmic region
  • (B) cut off
  • (C) Saturation
  • (D) cut off and saturation

A

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Q. The primary control on drain current in a JFET is exerted by which of the following ?

  • (A) Gate reverse bias
  • (B) Size of depletion regions
  • (C) Voltage drop across channel
  • (D) Channel resistance

A

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Q. The overall input capacitance of a dual-gate D-MOSFET is lower because the devices are usually connected ?

  • (A) in parallel
  • (B) with separate insulation
  • (C) with separate inputs
  • (D) in series

A

Admin • 833.24K Points
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Q. The type of bias most often used with E-MOSFET circuits is ?

  • (A) constant current
  • (B) drain-feedback
  • (C) voltage-divider
  • (D) zero biasing

A

Admin • 833.24K Points
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Q. N-channel FETs are superior to P-channel FETs because ?

  • (A) They have a higher switching
  • (B) They have a higher input impedance
  • (C) Mobility of electron is greater than that of holes
  • (D) All of the above

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