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Power Electronics

Power Electronics
Which semiconductor device acts like a diode and two transistor?

 Diac.
 UJT.
  Triac.
 SCR.

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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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Power Electronics
Which of following is not a power transistor?

 SITS.
 COOLMOS.
 IGBTs.
  TRIAC.

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Power Electronics
A diac has ___________ terminals.

Four
Three
None of these
Two

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Power Electronics
Maximum power loss occurs during

 spread time.
  rise time.
 all.
 delay time.

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Power Electronics
Typical range of thyristor turn OFF time is

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

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