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Power Electronics

Power Electronics
Which of following is normally ON device

  SIT.
 BJT.
 TRIAC.
 IGBT.

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Power Electronics
Maximum power loss occurs during

  rise time.
 all.
 delay time.
 spread time.

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Power Electronics
What is used to protect the SCR from over current ?

 Heat sink.
 Snubber circuit.
  CB and fuse.
 Voltage clamping device.

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Power Electronics
When the temperature increases, the inter-base resistance (RBB) of a UJT ___________.

None of these
Increases
Remains the same
Decreases

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Power Electronics
When the temperature increases, the intrinsic stand off ratio ___________.

Increases
None of these
Essentially remains the same
Decreases

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Power Electronics
A power semiconductor may undergo damage due to

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

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