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Power Electronics

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

  200 A.
 400 A.
 20 A.
 600 A.

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

  80.
 60.
 70.
 90.

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

  Inductor.
 Snubber circuit.
 Fuse.
 Voltage clamping device.

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 4242.64 A.
 6000 A.
 2121.32 A.
 1500 A.

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Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.27.
  0.67.
  0.32.
  0.45.

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Power Electronics
In a P1N1P2N2 thyristor which layer is less doped ?

 P1.
 P2.
 N2.
  N1.

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