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Power Electronics

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.
 0.2.
  0.25.
 0.75.

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Power Electronics
Snubber circuit is used with SCR

 anti parallel.
  in parallel.
 either series or parallel.
 in series.

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Power Electronics
A GTO can be turned on by applying

 Positive source signal.
  Positive gate signal.
 None of these.
 Positive drain signal.

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

 Fuse.
 Circuit breaker.
 Equalizing circuit.
  Snubber circuit.

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Power Electronics
Between the peak point and the valley point of UJT emitter characteristics we have ___________ region

None of these
Negative resistance
Cut-off
Saturation

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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

 3.714.
 60.
  37.14.
 65.

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