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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.
  0.25.
 0.7.
 0.2.

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 70.
 60.
 90.
  80.

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Power Electronics
Which of the following is not a characteristic of UJT?

Peak-point voltage
Bilateral conduction
Intrinsic stand off ratio
Negative resistance

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Power Electronics
Thyristor can be protected from over voltages by using

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

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Power Electronics
A triac is equivalent to two SCRs ___________.

In inverse-parallel
None of these
In series
In parallel

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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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