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Power Electronics

Power Electronics
Which of the following is used in heat sink?

 Silver.
 Iron.
  Aluminium.
 Carbon.

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

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

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Power Electronics
A UJT is sometimes called ___________ diode.

Double-base
Low resistance
High resistance
Single-base

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 1500 A.
 4242.64 A.
 6000 A.
 2121.32 A.

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Power Electronics
Thyristor can be protected from over voltages by using

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

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

50 Hz frequency
Frequencies less than 10 Hz
Frequencies above 1000 kHz
Frequencies above 20 kHz

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