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Power Electronics

Power Electronics
A triac has ___________ semiconductor layers.

Two
Five
Three
Four

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

Heavily
None of these
Moderately
Lightly

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Power Electronics
Power transistor are type of

  All of above.
 MOSFETs.
 IGBTs.
 BJTs.

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 60° to 120°.
 30° to 150°.
 30° to 180°.
 60° to 180°.

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Power Electronics
A UJT has ___________.

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

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Power Electronics
Which of the following is not a characteristic of UJT?

Intrinsic stand off ratio
Bilateral conduction
Peak-point voltage
Negative resistance

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