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Power Electronics

Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.67.
  0.45.
  0.27.
  0.32.

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

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

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Power Electronics
Gate circuit or triggering circuit of a thyristor is

 magnetic circuit.
  lower power circuit.
 may be low power or high power circuit.
 high power circuit.

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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

 140 μs.
 145 μs.
  135 μs.
 130 μs.

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

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

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Power Electronics
Which following is a two terminal three layer device?

  Power dioed.
 MOSFET.
 None of above.
 BJT.

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