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Power Electronics

Power Electronics
In a UJT, the p-type emitter is ___________ doped

Moderately
Heavily
Lightly
None of these

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Power Electronics
Maximum power loss occurs during

 spread time.
 delay time.
 all.
  rise time.

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

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Power Electronics
A UJT is sometimes called ___________ diode.

Low resistance
Single-base
High resistance
Double-base

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Power Electronics
A triac can pass a portion of ___________ half-cycle through the load.

None of these
Only positive
Only negative
Both positive and negative

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Power Electronics
SITH is also known as

 Filled controlled rectifier.
  Filled controlled diode.
 Silicon controlled rectifier.
 None of these.

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