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Power Electronics

Power Electronics
Which following is a two terminal three layer device?

 BJT.
 None of above.
 MOSFET.
  Power dioed.

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Power Electronics
SITH is also known as

 Filled controlled rectifier.
  Filled controlled diode.
 Silicon controlled rectifier.
 None of these.

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Power Electronics
Maximum power loss occurs during

 delay time.
 spread time.
 all.
  rise time.

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

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

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Power Electronics
The maximum di/dt in a SCR is

 Directly proportional to supply voltage.
  Both A and B.
 Directly proportional to inductance in the circuit.
 Inversely proportional to supply voltage.

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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

  80.
 90.
 70.
 60.

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