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Power Electronics

Power Electronics
A modern power semiconductor device that combines the characteristic of BJT and MOSFET is

 FCT.
  IGBT.
 MCT.
 GTO.

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

 Fuse.
 Snubber circuit.
 Voltage clamping device.
  Inductor.

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Power Electronics
Thyristor can be protected from over voltages by using

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

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Power Electronics
Materials used in heat sink should have

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

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Power Electronics
After proper turn on of thyristor

 gate signal should present but can be removed.
  gate signal must be removed.
None of these
 gate signal is always present.

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

 Carbon.
 Silver.
 Iron.
  Aluminium.

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