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Power Electronics

Power Electronics
Snubber circuit is used with SCR

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

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

None of these
Both positive and negative
Only negative
Only positive

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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 < Ig3.
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.
 Vc1 > Vc2 > Vc3 when Ig1= Ig2

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Power Electronics
Dynamic equalising circuit is useful

 to limit di / dt of SCR.
 for voltage equalisation.
  both B and C.
 to limit dV / dt of SCR.

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Same for every case.
  Spread time.
 Delay time.
 Rise time.

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Power Electronics
A power MOSFET has three terminals called

 Drain, source and base.
 Collector, emitter and base.
  Drain, source and gate.
 Collector, emitter and gate.

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