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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
4 thyristors rated 200 V in series. The operating voltage of the string is 0.600 V. Derating factor of the string is

 0.2.
 0.75.
 0.7.
  0.25.

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Power Electronics
How can we protect SCR from thermal conditions ?

  Using heat sink.
 Using equalizing circuit.
 Using CB and fuse.
 Use of snubber circuit.

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

  0.45.
  0.27.
  0.67.
  0.32.

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Power Electronics
IGBT combines the advantages of

 SITs and MOSFETs.
 None of these.
 BJTs and SITs.
  BJTs and MOSFETs.

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Power Electronics
The device that exhibits negative resistance region is ___________.

Diac
Transistor
UJT
Triac

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