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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.

Equal to
Less than
None of these
More than

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Power Electronics
During reverse recovery time

 charge carrier of junction J2 recombined.
  both B and C.
 charge carrier of junction J3 is swept out.
 charge carrier of junction J1 is swept out.

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Power Electronics
A diac is ___________ switch

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

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Power Electronics
The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ___________ in its first quadrant

Transistor
SCR
UJT
None of these

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Power Electronics
The typical time of rising time lies between

  1 - 4 µs.
 40 - 60 µs.
 90 - 100 µs.
 10 - 20 µs.

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Power Electronics
Which of following is not a power transistor?

  TRIAC.
 COOLMOS.
 IGBTs.
 SITS.

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