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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 40 mA.
 60 mA.
 23 mA.
  10 mA.

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Power Electronics
Thyristor can be protected from over voltages by using

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

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Power Electronics
A triac is a ___________ switch

Unidirectional
Bidirectional
None of these
Mechanical

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Power Electronics
Typical range of thyristor turn OFF time is

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

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Power Electronics
A diac has ___________ semiconductor layers

Two
None of these
Four
Three

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

 Equalizing circuit.
 Circuit breaker.
 Fuse.
  Snubber circuit.

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