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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.

More than
Less than
None of these
Equal to

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Power Electronics
Which semiconductor device acts like a diode and two transistor?

  Triac.
 SCR.
 UJT.
 Diac.

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

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

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

  of long period.
 neither (A) nor (B).
 of short duration.
 both (A) and (B).

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Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.7.
 0.75.
 0.2.
  0.25.

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Power Electronics
After peak point, the UJT operates in the ___________ region.

Negative resistance
Saturation
None of these
Cut-off

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