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Power Electronics

Power Electronics
When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ___________.

None of these
Low
Extremely low
High

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Power Electronics
A triac has ___________ semiconductor layers.

Two
Three
Five
Four

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Power Electronics
Typical range of thyristor turn OFF time is

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

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Power Electronics
A GTO can be turned on by applying

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

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

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

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Power Electronics
Which following is a two terminal three layer device?

  Power dioed.
 BJT.
 None of above.
 MOSFET.

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