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Power Electronics

Power Electronics
A diac has ___________ terminals.

Two
None of these
Four
Three

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Power Electronics
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

  0.25.
 0.2.
 0.7.
 0.75.

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Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 23 mA.
 40 mA.
 60 mA.
  10 mA.

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

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

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Power Electronics
ON state voltage drop across SCR lie between the range

 0.5 - 1 V.
  1 - 1.5 V.
 1.5 - 2 V.
 0 - 0.5 V.

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

  Snubber circuit.
 Fuse.
 Circuit breaker.
 Equalizing circuit.

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