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Power Electronics

Power Electronics
Which semiconductor device acts like a diode and two transistor?

 UJT.
 SCR.
 Diac.
  Triac.

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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

 60.
  80.
 90.
 70.

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Power Electronics
Thyristor can be protected from over voltages by using

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

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Power Electronics
Which of following is not a power transistor?

 IGBTs.
  TRIAC.
 SITS.
 COOLMOS.

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Power Electronics
The normal way to turn on a diac is by ___________.

None of these
Gate current
Breakover voltage
Gate voltage

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Power Electronics
A single phase full bridge inverter can operate in load commutation mode in case load consists of

 RL.
 RLC overdamped.
  RLC underdamped.
 RLC critically damped.

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