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Power Electronics

Power Electronics
The typical value of SCR for modern alternator is

 1.0.
 0.5.
 1.2.
 1.5.

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Power Electronics
A triac can pass a portion of ___________ half-cycle through the load.

Only positive
None of these
Both positive and negative
Only negative

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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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Power Electronics
A triac has ___________ semiconductor layers.

Five
Three
Four
Two

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Power Electronics
The latching current of SCR is 20 mA. Its holding current will be

 40 mA.
 23 mA.
 60 mA.
  10 mA.

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Power Electronics
Which of the following is used in SCR to protect from high dV / dt?

 Circuit breaker.
  Snubber circuit.
 Equalizing circuit.
 Fuse.

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