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Power Electronics

Power Electronics
A triac is a ___________ switch

Mechanical
Unidirectional
None of these
Bidirectional

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Power Electronics
The turn-on time of an SCR with inductive load is 20 µs. The puls train frequency is 2.5 KHz with a mark/space ratio of 1/10, then SCR will

 Turn on if inductance is removed.
  Turn on.
 Not turn on.
 Turn on if pulse frequency us increased to two times.

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Power Electronics
A diac has ___________ terminals.

Two
Four
None of these
Three

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Power Electronics
Why resistor is used in Snubber circuit ?

  To minimize the discharging current.
 To minimize the charging current.
 All of these.
 To minimize the loss .

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Power Electronics
After peak point, the UJT operates in the ___________ region.

Saturation
None of these
Cut-off
Negative resistance

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

 BJT.
  Power dioed.
 MOSFET.
 None of above.

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