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Power Electronics

Power Electronics
To turn on UJT, the forward bias on the emitter diode should be ___________ the peak point voltage.

None of these
Equal to
More than
Less than

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Power Electronics
The reverse recovery time of diode is trr = 3 μs and the rate off all of the diode current is di/dt = 30 A/μs. The storage charge current QRR is

 130 μs.
 140 μs.
  135 μs.
 145 μs.

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Power Electronics
A Triac has three terminals viz ___________

Two main terminal and a gate terminal
Drain, source, gate
None of these
Cathode, anode, gate

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Power Electronics
A diac is ___________ switch

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

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Power Electronics
Which of following is not a power transistor?

 SITS.
 IGBTs.
 COOLMOS.
  TRIAC.

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Power Electronics
A diac has ___________ pn junctions

Three
None of these
Four
Two

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