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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

 0.7.
 0.2.
 0.75.
  0.25.

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Power Electronics
Typical range of thyristor turn OFF time is

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

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Power Electronics
What may happen high dV / dt?

 Breakdown of J2 junction.
  Both A and B.
 Anyone of these.
 Unwanted turn ON.

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Power Electronics
A diac has ___________ terminals.

Two
Three
None of these
Four

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Power Electronics
Thyristor can be protected from over voltages by using

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

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

 neither (A) nor (B).
 both (A) and (B).
 of short duration.
  of long period.

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