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Power Electronics

Power Electronics
Thyristor can be protected from over voltages by using

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

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Power Electronics
Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

 2 KV.
  8 KV.
 10 KV.
 6 KV.

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Power Electronics
Thermal voltage VT can be given by

  Kq/T.
 KT/q.
 qT/K.
 (K2/q)(T + 1/T - 1).

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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

 90.
  80.
 70.
 60.

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Power Electronics
After proper turn on of thyristor

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

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Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 400 A.
 20 A.
 600 A.
  200 A.

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