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Power Electronics

Power Electronics
A diac has ___________ pn junctions

None of these
Two
Four
Three

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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.
 0.75.
 0.2.
  0.25.

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 90.
 60.
 70.
  80.

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Power Electronics
The latching current of GTO should be of order

  500 mA.
 2 A.
 1 A.
 100 mA.

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

 SITH.
  GTO.
 SCR.
 SIT.

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Power Electronics
Example of a voltage clamping device

 fast acting fuse.
 aluminium block.
 snubber circuit.
  metal oxide varistor.

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