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Power Electronics

Power Electronics
If the anode current is 800 A, then the amount of current required to turn off the GTO is about

 600 A.
 400 A.
 20 A.
  200 A.

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

 GTO.
  IGBT.
 FCT.
 MCT.

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Power Electronics
A diac is simply ___________.

A three junction device
A single junction device
A triac without gate terminal
None of these

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 30° to 180°.
 30° to 150°.
 60° to 180°.
 60° to 120°.

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Power Electronics
A diac has ___________ terminals.

None of these
Two
Four
Three

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Power Electronics
Materials used in heat sink should have

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

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