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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

 0.2.
 0.75.
 0.7.
  0.25.

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Power Electronics
Light triggering mainly used in

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

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Power Electronics
When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?

 Snubber circuit.
  Fast acting current limiting device (FACL fuse).
 CB.
 Voltage clamping device.

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Power Electronics
Typical range of thyristor turn OFF time is

 3 - 500 µs.
  3 - 100 µs.
 3 - 10 µs.
 3 - 50 µs.

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Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

 SIT.
 SITH.
 SCR.
  GTO.

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Power Electronics
SCRs are used in series to meet

 high current demand.
 low voltage demand.
  high voltage demand.
 low current demand.

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