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Power Electronics

Power Electronics
A triac has ___________ semiconductor layers.

Five
Three
Two
Four

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Power Electronics
A diac is simply ___________.

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

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Power Electronics
During reverse recovery time

 charge carrier of junction J1 is swept out.
 charge carrier of junction J3 is swept out.
  both B and C.
 charge carrier of junction J2 recombined.

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

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Power Electronics
Snubber circuit is used with SCR

 in series.
 either series or parallel.
 anti parallel.
  in parallel.

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Power Electronics
Compared to transistor, ______________ have lower on state conduction losses and higher power handling capability

  Thyristor.
 MOSFETs.
 TRIACs.
 Semi conductor diodes.

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