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POWER ELECTRONICS

Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 zero value.
 low value.
  high value.
 moderate value.

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

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

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

  of long period.
 both (A) and (B).
 neither (A) nor (B).
 of short duration.

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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 ?

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

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Power Electronics
How can we protect SCR from thermal conditions ?

  Using heat sink.
 Use of snubber circuit.
 Using equalizing circuit.
 Using CB and fuse.

ANSWER DOWNLOAD EXAMIANS APP
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