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Power Electronics

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

 60 mA.
 40 mA.
 23 mA.
  10 mA.

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Power Electronics
When a large surge current of very short duration flows through a thyristor then which one of the following device will operate to protect the thyristor ?

 Snubber circuit.
 CB.
 Voltage clamping device.
  Fast acting current limiting device (FACL fuse).

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Power Electronics
Anode current in an SCR consists of

  either electron or holes.
  Both electron and holes.
  electrons only.
  holes only.

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Power Electronics
The typical value of SCR for modern alternator is

 1.5.
 1.0.
 1.2.
 0.5.

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

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

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Power Electronics
Snubber circuit is used with SCR

 in series.
 anti parallel.
 either series or parallel.
  in parallel.

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