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Power Electronics

Power Electronics
A triac has ___________ semiconductor layers.

Three
Two
Four
Five

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Power Electronics
The UJT may be used as ___________.

A rectifier
A sawtooth generator
Am amplifier
None of these

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Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.32.
  0.27.
  0.67.
  0.45.

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Power Electronics
Typical range of thyristor turn OFF time is

 3 - 500 µs.
 3 - 50 µs.
 3 - 10 µs.
  3 - 100 µs.

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Power Electronics
Which of following is normally ON device

  SIT.
 TRIAC.
 IGBT.
 BJT.

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Power Electronics
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then

 Vc1 = Vc2 = Vc3 any value of Ig.
 Vc1 > Vc2 > Vc3 when Ig1= Ig2
  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.

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