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Power Electronics

Power Electronics
The triac is ___________.

A four-terminal device
Like a bidirectional SCR
Not a thyristor
None of these

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Power Electronics
The function of snubber circuit connected across the SCR is to

 decrease dV / dt.
  suppress dV / dt.
 increase dV / dt.
 decrease di / dt.

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

 Equalizing circuit.
 Fuse.
 Circuit breaker.
  Snubber circuit.

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

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

 60 mA.
  10 mA.
 23 mA.
 40 mA.

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Power Electronics
A UJT has ___________.

One pn junction
Two pn junctions
None of these
Three pn junctions

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