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Power Electronics

Power Electronics
A triac is a ___________ switch

Unidirectional
Mechanical
Bidirectional
None of these

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Power Electronics
What may happen high dV / dt?

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

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Power Electronics
Light triggering mainly used in

 low - voltage direct current transmission.
  all of these.
 medium voltage direct current transmission.
  high voltage direct current transmission.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Same for every case.
 Delay time.
  Spread time.
 Rise time.

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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.
  135 μs.
 140 μs.
 145 μs.

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Power Electronics
What happen due to high di / dt?

 None of these.
 Insulation failure.
  Local hot spot.
 Breakdown of junction.

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