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Power Electronics

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

 Iron.
 Carbon.
 Silver.
  Aluminium.

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Power Electronics
The typical time of rising time lies between

 40 - 60 µs.
  1 - 4 µs.
 10 - 20 µs.
 90 - 100 µs.

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Power Electronics
When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________

Is increased
Is decreased
Remains the same
None of these

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Power Electronics
Under over voltage condition impedance offered by the voltage clamping device is

 moderate.
  low.
 high.
 infinity.

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Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

  0.004 A.
 0.009 A.
 0.01 A.
 0.002 A.

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Power Electronics
Maximum power loss occurs during

 all.
 spread time.
 delay time.
  rise time.

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