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Power Electronics

Power Electronics
A step up chopper has input voltage 110 V and output voltage 150 V. The value of duty cycle is

  0.27.
  0.32.
  0.45.
  0.67.

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Power Electronics
The device that does not have the gate terminal is ___________.

Diac
SCR
FET
Triac

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Power Electronics
During which time maximum conduction spreading take place in the thyristor during turn ON?

 Rise time.
 Same for every case.
 Delay time.
  Spread time.

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Power Electronics
Thyristor can be protected from over voltages by using

  voltage clamping device.
 fuse.
 heat sink.
 snubber circuit.

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Power Electronics
A UJT has ___________.

Three pn junctions
None of these
One pn junction
Two pn junctions

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Power Electronics
Example of a voltage clamping device

 aluminium block.
 snubber circuit.
  metal oxide varistor.
 fast acting fuse.

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