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Power Electronics

Power Electronics
Switching frequency of SITH is

 60 KHz.
 10 KHz.
  100 KHz.
 5 KHz.

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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?

 10 KV.
  8 KV.
 6 KV.
 2 KV.

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Power Electronics
Spread time is defined as the interval during which

 both (A) and (B).
 anode voltage drops from 10 % of its initial value to zero.
 anode current rises from 10 % to 90 % of its final value.
  anode current rises from 90 % to its final value.

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Power Electronics
Typical range of thyristor turn OFF time is

  3 - 100 µs.
 3 - 50 µs.
 3 - 500 µs.
 3 - 10 µs.

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Power Electronics
The typical value of SCR for modern alternator is

 1.0.
 1.2.
 0.5.
 1.5.

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Power Electronics
Which of following is not a power transistor?

 IGBTs.
 SITS.
  TRIAC.
 COOLMOS.

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