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POWER ELECTRONICS

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

 Silver.
 Carbon.
 Iron.
  Aluminium.

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Power Electronics
Materials used in heat sink should have

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

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Power Electronics
What is used to protect a thyristor from high di / dt conditions?

 Voltage clamping device.
 Fuse.
  Inductor.
 Snubber circuit.

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

  Snubber circuit.
 Equalizing circuit.
 Fuse.
 Circuit breaker.

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Power Electronics
What happen due to high di / dt?

 Breakdown of junction.
 Insulation failure.
 None of these.
  Local hot spot.

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