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Electrical Engineering Mcqs

Which of the following is true about SIT?

  • (A)  SIT is a high power, high frequency device
  • (B)  SIT is a high power, low frequency device
  • (C)  SIT is a high power, high voltage device
  • (D)  SIT is a low power, high frequency device
Submitted By :Ali Uppal

During which time maximum conduction spreading take place in the thyristor during turn ON?

  • (A)  Delay time
  • (B)  Spread time
  • (C)  Rise time
  • (D)  Same for every case
Submitted By :Ali Uppal

A GTO can be turned on by applying___________?

  • (A)  Positive gate signal
  • (B)  Positive drain signal
  • (C)  Positive source signal
  • (D)  None of these
Submitted By :Ali Uppal

Maximum di / dt in a SCR is________?

  • (A)  Directly proportional to Vm of supply voltage
  • (B)  Inversely proportional to Vm of supply voltage
  • (C)  Inversely proportional to L in the circuit
  • (D)  Both A and C
Submitted By :Ali Uppal

Submitted By :Ali Uppal

For series connected SCR’s dynamic equalising circuit consists of___________?

  • (A)  R and C in series but with diode across C
  • (B)  R and C in series but with diode across R
  • (C)  Series R and diode with C across R
  • (D)  Series R and diode with C across R
Submitted By :Ali Uppal

By which one of the following we can measure the reliability of a string_____________?

  • (A)  String efficient
  • (B)  Reliability factor
  • (C)  Factor of safety
  • (D)  Derating factor
Submitted By :Ali Uppal

Anode current in an SCR consists of____________?

  • (A)  holes only
  • (B)  electrons only
  • (C)  either electron or holes
  • (D)  Both electron and holes
Submitted By :Ali Uppal

To meet high current demand we use SCRs in______________?

  • (A)  series connection.
  • (B)  parallel connection.
  • (C)  anti parallel connection.
  • (D)  both B and C.
Submitted By :Ali Uppal

Dynamic equalising circuit is useful____________?

  • (A)  To limit di / dt of SCR
  • (B)  To limit dV / dt of SCR
  • (C)  For voltage equalisation
  • (D)  Both B and C
Submitted By :Ali Uppal

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