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POWER ELECTRONICS

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.

 200 µs.
  100 µs.
 300 µs.
 150 µs.

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

 40 mA.
  10 mA.
 60 mA.
 23 mA.

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Power Electronics
Thyristor can be protected from over voltages by using

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

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Power Electronics
Example of a voltage clamping device

 snubber circuit.
 aluminium block.
  metal oxide varistor.
 fast acting fuse.

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Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 moderate.
 high.
 infinity.
  low.

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