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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.01 A.
 0.002 A.
  0.004 A.
 0.009 A.

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Power Electronics
Spread time is defined as the interval during which

  anode current rises from 90 % to its final value.
 anode current rises from 10 % to 90 % of its final value.
 anode voltage drops from 10 % of its initial value to zero.
 both (A) and (B).

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

Essentially remains the same
Decreases
Increases
None of these

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Rise time.
 Same for every case.
  Spread time.
 Delay time.

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Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 400 A.
 20 A.
  200 A.
 600 A.

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Power Electronics
What is used to protect the SCR from over current ?

 Voltage clamping device.
 Snubber circuit.
 Heat sink.
  CB and fuse.

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