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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.009 A.
  0.004 A.
 0.002 A.
 0.01 A.

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Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

  135 μs.
 140 μs.
 145 μs.
 130 μs.

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Power Electronics
BCT is used for

 Low power current control.
 High power current control.
  High power phase control.
 Low power phase control.

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

  Inductor.
 Fuse.
 Snubber circuit.
 Voltage clamping device.

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Power Electronics
A power MOSFET has three terminals called

 Drain, source and base.
 Collector, emitter and base.
 Collector, emitter and gate.
  Drain, source and gate.

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Power Electronics
Light triggering mainly used in

  high voltage direct current transmission.
  all of these.
 medium voltage direct current transmission.
 low - voltage direct current transmission.

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