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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

 0.75.
 0.7.
  0.25.
 0.2.

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Power Electronics
A diac has ___________ pn junctions

Three
None of these
Two
Four

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

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

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Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

  10 mA.
 40 mA.
 60 mA.
 23 mA.

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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

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

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Power Electronics
Calculate the maximum voltage that can be safely blocked by the string shown in figure, if maximum allowable leakage current is 2 mA?

 2 KV.
  8 KV.
 6 KV.
 10 KV.

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