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Power Electronics

Power Electronics
Which of following is not a power transistor?

  TRIAC.
 SITS.
 IGBTs.
 COOLMOS.

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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.
  0.25.
 0.2.
 0.75.

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Power Electronics
Example of a voltage clamping device

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

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Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

Remains the same
Increases
None of these
Decreases

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Power Electronics
COOLMOS device can be used in application up to power range of

 100 KVA.
 500 VA.
  2 KVA.
 1 KVA.

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

None of these
Remains the same
Is decreased
Is increased

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