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Power Electronics

Power Electronics
A triac is a ___________ switch

None of these
Mechanical
Bidirectional
Unidirectional

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Power Electronics
Which of following devices has highest di/dt and dv/dt capability?

 SIT.
 SITH.
  GTO.
 SCR.

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

High
Extremely low
None of these
Low

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Power Electronics
Under normal operating condition voltage clamping device offers impedance of

 zero value.
  high value.
 low value.
 moderate value.

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

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

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Power Electronics
A diac has ___________ terminals.

Two
Three
Four
None of these

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