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Electrical Engineering Mcqs

Gate circuit or triggering circuit of a thyristor is

  • (A)  lower power circuit.
  • (B)  high power circuit.
  • (C)  magnetic circuit.
  • (D)  may be low power or high power circuit
Submitted By :Ali Uppal

After proper turn on of thyristor____________?

  • (A)  gate signal is always present
  • (B)  gate signal must be removed
  • (C)  gate signal should present but can be removed
  • (D)  none of the abov
Submitted By :Ali Uppal

SCR will be turned off when anode current is_______________?

  • (A)  < latching current but greater than holding current and gate signal is 0.
  • (B)  less than holding current.
  • (C)  < latching current but greater than holding current and gate signal is present.
  • (D)  both (A) and (B).
Submitted By :Ali Uppal

Submitted By :Ali Uppal

Which one is most suitable power device for high frequency (>100 KHz) switching application?

  • (A)  BJT
  • (B)  Power MOSFET
  • (C)  Schottky diode
  • (D)  Microwave transistor
Submitted By :Ali Uppal

Snubber circuit is used with SCR_________________?

  • (A)  in series
  • (B)  in parallel
  • (C)  either series or parallel
  • (D)  anti parallel
Submitted By :Ali Uppal

Why resistor is used in Snubber circuit_________________ ?

  • (A)  To minimize the loss
  • (B)  To minimize the charging current
  • (C)  To minimize the discharging current
  • (D)  All of these
Submitted By :Ali Uppal

What may happen high dV / dt____________?

  • (A)  Unwanted turn ON
  • (B)  Breakdown of J2 junction
  • (C)  Both A and B
  • (D)  Anyone of these
Submitted By :Ali Uppal

Thermal voltage VT can be given by____________?

  • (A)  Kq/T
  • (B)  KT/q
  • (C)  qT/K
  • (D)  (K2/q)(T + 1/T – 1)
Submitted By :Ali Uppal

What happen due to high di / dt____________?

  • (A)  Breakdown of junction
  • (B)  Local hot spot
  • (C)  Insulation failure
  • (D)  None of these
Submitted By :Ali Uppal

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