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Power Electronics

Power Electronics
The UJT may be used as ___________.

None of these
Am amplifier
A sawtooth generator
A rectifier

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

  Inductor.
 Voltage clamping device.
 Snubber circuit.
 Fuse.

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Power Electronics
Which of following is not a power transistor?

 SITS.
  TRIAC.
 COOLMOS.
 IGBTs.

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Power Electronics
A triac is a ___________ switch

Unidirectional
Mechanical
Bidirectional
None of these

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Power Electronics
The normal way to turn on a diac is by ___________.

Breakover voltage
None of these
Gate current
Gate voltage

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

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