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Power Electronics

Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.75.
 0.7.
 0.2.
  0.25.

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Power Electronics
Thyristor can be protected from over voltages by using

 heat sink.
 fuse.
 snubber circuit.
  voltage clamping device.

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

  Spread time.
 Delay time.
 Same for every case.
 Rise time.

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Power Electronics
Light triggering mainly used in

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

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Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 N2.
 P2.
 P1.
  N1.

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Power Electronics
The maximum di/dt in a SCR is

 Directly proportional to supply voltage.
 Inversely proportional to supply voltage.
  Both A and B.
 Directly proportional to inductance in the circuit.

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