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Power Electronics

Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.75.
 0.7.
  0.25.
 0.2.

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Power Electronics
After proper turn on of thyristor

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

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Power Electronics
A power semiconductor may undergo damage due to

  High di/dt.
 High dv/dt.
 Low dv/dt.
 Low di/dt.

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Power Electronics
Which of the following is disadvantage of fast recovery diodes?

 Recovery is only 5 µs.
  Doping is carried out.
 Recovery is only 50 µs.
 None of these.

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Power Electronics
The function of snubber circuit connected across the SCR is to

 decrease dV / dt.
 increase dV / dt.
 decrease di / dt.
  suppress dV / dt.

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Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

 SCR.
 SITH.
  GTO.
 SIT.

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