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Power Electronics

Power Electronics
A diac is turned on by ___________.

None of these
Gate voltage
Gate current
A breakover voltage

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Power Electronics
What may happen high dV / dt?

 Breakdown of J2 junction.
  Both A and B.
 Unwanted turn ON.
 Anyone of these.

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

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Power Electronics
Which of the following is used in heat sink?

 Silver.
 Carbon.
 Iron.
  Aluminium.

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

Cut-off
Saturation
None of these
Negative resistance

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Power Electronics
SCRs are used in series to meet

 high current demand.
 low voltage demand.
 low current demand.
  high voltage demand.

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