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Power Electronics

Power Electronics
The latching current of GTO should be of order

 100 mA.
 1 A.
  500 mA.
 2 A.

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Power Electronics
The normal way to turn on a diac is by ___________.

None of these
Gate current
Gate voltage
Breakover voltage

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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.
 0.75.
 0.7.

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Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

 300 µs.
 200 µs.
 150 µs.
  100 µs.

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

 neither (A) nor (B).
 of short duration.
 both (A) and (B).
  of long period.

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Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

  GTO.
 SIT.
 SCR.
 SITH.

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