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Power Electronics

Power Electronics
A diac has ___________ terminals.

Two
Four
None of these
Three

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 30° to 180°.
 30° to 150°.
 60° to 180°.
 60° to 120°.

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

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

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Power Electronics
A modern power semiconductor device that combines the characteristic of BJT and MOSFET is

 GTO.
 FCT.
 MCT.
  IGBT.

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Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 high.
 infinity.
  low.
 moderate.

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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

 145 μs.
 140 μs.
  135 μs.
 130 μs.

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