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Power Electronics

Power Electronics
A power semiconductor may undergo damage due to

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

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Power Electronics
The triac is ___________.

A four-terminal device
None of these
Like a bidirectional SCR
Not a thyristor

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Power Electronics
A diac has ___________ pn junctions

Three
None of these
Two
Four

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Power Electronics
After proper turn on of thyristor

None of these
  gate signal must be removed.
 gate signal should present but can be removed.
 gate signal is always present.

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 60° to 180°.
 30° to 180°.
 60° to 120°.
 30° to 150°.

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Power Electronics
Which of following is normally ON device

 BJT.
  SIT.
 IGBT.
 TRIAC.

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