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Electrical Engineering Mcqs

A single phase ac – dc converter is also known as____________?

  • (A)  rectifier
  • (B)  inverter
  • (C)  chopper
  • (D)  regulator
Submitted By :Ali Uppal

The output power of the cascaded amplifier / attenuator system can be determined using___________?

  • (A)  Actual gain of amplifier
  • (B)  Actual gain of amplifier and attenuator
  • (C)  Gain in dB of amplifier and attenuator
  • (D)  Actual gain of attenuator
Submitted By :Ali Uppal

The effects of EMI can be reduced by____________?

  • (A)  Suppressing emissions
  • (B)  Reducing the efficiency of the coupling path
  • (C)  Reducing the susceptibility of the receptor
  • (D)  All of these
Submitted By :Ali Uppal

Choppers is a_______________?

  • (A)  AC – DC converters
  • (B)  AC – AC converters
  • (C)  DC – AC converters
  • (D)  DC – DC converters
Submitted By :Ali Uppal

In radiative coupling, the emitter radiation field_____________?

  • (A)  Decays as 1 / R, where R is the separation distance between the emitter and the receptor
  • (B)  Decays as R, where R is the separation distance between the emitter and the receptor
  • (C)  Decays as 1 / 2 R, where R is the separation distance between the emitter and the receptor
  • (D)  Decays as 2R, where R is the separation distance between the emitter and the receptor
Submitted By :Ali Uppal

In BJT, switching losses occurs___________?

  • (A)  Only at turn – on
  • (B)  Only at turn – off
  • (C)  Both at turn on and off
  • (D)  None of these
Submitted By :Ali Uppal

In BJT, the forward biased base emitter junction inject holes from base to emitter, the holes_______?

  • (A)  Do not contribute to the collector current
  • (B)  Result in net current flow component into the base
  • (C)  Contribute to the collector current
  • (D)  Only (a) and (b)
  • (E)  Only (b) and (c)
Submitted By :Ali Uppal

In EMC signal, the source delivers maximum power to the input of transmission line when the transmission line input impedance

  • (A)  Is equal to the source resistance
  • (B)  Greater than the source resistance
  • (C)  Smaller than the source resistance
  • (D)  None of these
Submitted By :Ali Uppal

As the breakdown voltage reached, the DIAC exhibits?

  • (A)  Negative resistance characteristics
  • (B)  Goes into avalanche condition
  • (C)  Voltage drop snaps back
  • (D)  All of these
Submitted By :Ali Uppal

For swept frequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length of the transmission line would

  • (A)  Decrease with frequency
  • (B)  Remains same with change in frequency
  • (C)  Increase with frequency
  • (D)  Either
Submitted By :Ali Uppal

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