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Power Electronics

Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 40 mA.
 60 mA.
 23 mA.
  10 mA.

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

 Carbon.
 Iron.
 Silver.
  Aluminium.

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Power Electronics
Which of following is normally ON device

 IGBT.
 BJT.
  SIT.
 TRIAC.

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Power Electronics
The typical time of rising time lies between

 90 - 100 µs.
 10 - 20 µs.
 40 - 60 µs.
  1 - 4 µs.

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Power Electronics
A UJT has ___________.

One pn junction
None of these
Three pn junctions
Two pn junctions

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

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