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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

  0.004 A.
 0.002 A.
 0.01 A.
 0.009 A.

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Power Electronics
Example of a voltage clamping device

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

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Power Electronics
The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will

 Turn on if pulse frequency us increased to two times.
 Turn on if inductance is removed.
 Not turn on.
  Turn on.

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

Remains the same
Decreases
None of these
Increases

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Power Electronics
The typical time of rising time lies between

 10 - 20 µs.
 90 - 100 µs.
  1 - 4 µs.
 40 - 60 µs.

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Power Electronics
A diac is ___________ switch

A d.c.
An c.
None of these
A mechanical

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