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Power Electronics

Power Electronics
A UJT has ___________.

None of these
One pn junction
Two pn junctions
Three pn junctions

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

 of short duration.
 neither (A) nor (B).
 both (A) and (B).
  of long period.

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Power Electronics
A GTO can be turned on by applying

 Positive source signal.
 Positive drain signal.
 None of these.
  Positive gate signal.

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Power Electronics
SCRs are used in series to meet

 low current demand.
 high current demand.
 low voltage demand.
  high voltage demand.

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Power Electronics
Snubber circuit is used with SCR

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

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Power Electronics
A triac has ___________ semiconductor layers.

Three
Four
Two
Five

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