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Power Electronics

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

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

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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

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

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Power Electronics
A diac has ___________ semiconductor layers

Two
None of these
Four
Three

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Power Electronics
Typical range of thyristor turn OFF time is

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

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Power Electronics
A diac is ___________ switch

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

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Power Electronics
ON state voltage drop across SCR lie between the range

 0.5 - 1 V.
  1 - 1.5 V.
 1.5 - 2 V.
 0 - 0.5 V.

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