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Power Electronics

Power Electronics
A triac is a ___________ switch

Mechanical
Bidirectional
Unidirectional
None of these

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Power Electronics
The typical value of SCR for modern alternator is

 1.5.
 1.2.
 0.5.
 1.0.

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Power Electronics
Which of the following is not a characteristic of UJT?

Negative resistance
Intrinsic stand off ratio
Bilateral conduction
Peak-point voltage

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Power Electronics
SCRs are used in series to meet

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

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Power Electronics
A power semiconductor may undergo damage due to

  High di/dt.
 Low di/dt.
 High dv/dt.
 Low dv/dt.

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Power Electronics
Which of the following is used in heat sink?

  Aluminium.
 Carbon.
 Iron.
 Silver.

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