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Power Electronics

Power Electronics
Which of following is not a power transistor?

  TRIAC.
 COOLMOS.
 IGBTs.
 SITS.

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

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

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Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 N2.
 P1.
 P2.
  N1.

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Power Electronics
BCT is used for

 Low power phase control.
 Low power current control.
 High power current control.
  High power phase control.

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Power Electronics
Spread time is defined as the interval during which

 anode voltage drops from 10 % of its initial value to zero.
  anode current rises from 90 % to its final value.
 both (A) and (B).
 anode current rises from 10 % to 90 % of its final value.

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Power Electronics
A UJT is sometimes called ___________ diode.

Double-base
Low resistance
Single-base
High resistance

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