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Power Electronics

Power Electronics
A triac is a ___________ switch

Bidirectional
None of these
Mechanical
Unidirectional

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Power Electronics
Example of a voltage clamping device

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

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

 moderate.
  low.
 infinity.
 high.

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Power Electronics
Leakage current flows through the thyristor in

  both forward and reverse blocking mode.
 forward conduction mode.
 reverse blocking mode.
 forward blocking mode.

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Power Electronics
Which of the following is used in heat sink?

 Iron.
 Silver.
  Aluminium.
 Carbon.

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

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

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