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Power Electronics

Power Electronics
The typical value of SCR for modern alternator is

 1.2.
 0.5.
 1.5.
 1.0.

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Power Electronics
After proper turn on of thyristor

None of these
  gate signal must be removed.
 gate signal should present but can be removed.
 gate signal is always present.

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Power Electronics
Leakage current flows through the thyristor in

 forward conduction mode.
 forward blocking mode.
 reverse blocking mode.
  both forward and reverse blocking mode.

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Power Electronics
Which of following is not a power transistor?

 IGBTs.
 COOLMOS.
  TRIAC.
 SITS.

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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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Power Electronics
Thyristor can be protected from over voltages by using

 heat sink.
 fuse.
 snubber circuit.
  voltage clamping device.

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