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Electrical Engineering Mcqs

Example of a voltage clamping device______________?

  • (A)  fast acting fuse
  • (B)  snubber circuit
  • (C)  metal oxide varistor
  • (D)  aluminium block
Submitted By :Ali Uppal


Switching frequency of SITH is____________?

  • (A)  5 KHz
  • (B)  10 KHz
  • (C)  60 KHz
  • (D)  100 KHz
Submitted By :Ali Uppal


Practical way of obtaining static voltage equalization in series connected SCRs is by the use of____________?

  • (A)  One resistor across the string
  • (B)  Resistors of the same value across each SCR
  • (C)  Resistors of different values across each SCR
  • (D)  One resistor in series with each SCR
Submitted By :Ali Uppal


Thyristor can be protected from over voltages by using____________?

  • (A)  voltage clamping device.
  • (B)  fuse.
  • (C)  heat sink.
  • (D)  snubber circuit.
Submitted By :Ali Uppal


BCT is used for____________?

  • (A)  High power phase control
  • (B)  High power current control
  • (C)  Low power current control
  • (D)  Low power phase control
Submitted By :Ali Uppal


Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then________________?

  • (A)  Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
  • (B)  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
  • (C)  Vc1 = Vc2 = Vc3 any value of Ig.
  • (D)  Vc1 > Vc2 > Vc3 when Ig1 ≥ Ig2 &Atil
Submitted By :Ali Uppal


Submitted By :Ali Uppal


Which triggering is the most reliable____________?

  • (A)  Forward voltage triggering
  • (B)  Gate triggering
  • (C)  dV / dt triggering
  • (D)  Thermal triggering
Submitted By :Ali Uppal


Leakage current flows through the thyristor in_________?

  • (A)  forward blocking mode
  • (B)  reverse blocking mode
  • (C)  both forward and reverse blocking mode
  • (D)  forward conduction mode
Submitted By :Ali Uppal


Which of the following is disadvantage of fast recovery diodes?

  • (A)  Recovery is only 5 µs
  • (B)  Recovery is only 50 µs
  • (C)  Doping is carried out
  • (D)  None of these
Submitted By :Ali Uppal