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Power Electronics

Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 65.
 3.714.
 60.
  37.14.

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Power Electronics
After proper turn on of thyristor

 gate signal should present but can be removed.
  gate signal must be removed.
None of these
 gate signal is always present.

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Power Electronics
The device that exhibits negative resistance region is ___________.

Transistor
UJT
Triac
Diac

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

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

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Power Electronics
Thyristor can be protected from over voltages by using

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

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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

 0.7.
  0.25.
 0.75.
 0.2.

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