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Power Electronics

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

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

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Power Electronics
Materials used in heat sink should have

 high melting point.
 large surface area.
  All of these.
 high thermal conductivity.

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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

  0.67.
  0.45.
  0.32.
  0.27.

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Power Electronics
SCRs are used in series to meet

  high voltage demand.
 low voltage demand.
 low current demand.
 high current demand.

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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

 70.
  80.
 60.
 90.

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Power Electronics
Thyristor can be protected from over voltages by using

 snubber circuit.
 heat sink.
 fuse.
  voltage clamping device.

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