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Power Electronics

Power Electronics
A triac is a ___________ switch

Mechanical
None of these
Unidirectional
Bidirectional

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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.
 140 μs.
 145 μs.
  135 μs.

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Power Electronics
Light triggering mainly used in

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

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Power Electronics
A triac has ___________ semiconductor layers.

Two
Five
Four
Three

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Power Electronics
By which one of the following we can measure the reliability of a string?

 Factor of safety.
 String efficient.
 Reliability factor.
  Derating factor.

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Power Electronics
Which one is most suitable power device for high frequency (>100 KHz) switching application?

 Schottky diode.
 Microwave transistor.
  Power MOSFET.
 BJT.

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