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Power Electronics

Power Electronics
Figure shows two thyristors rated 400 A sharing a load current. Current through T2 is 180A. Current through T1 will be

  150 A.
 100 A.
 120 A.
 110 A.

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Power Electronics
Which triggering is the most reliable?

  Thermal triggering.
  Forward voltage triggering.
  Gate triggering.
  dV / dt triggering.

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Power Electronics
The UJT may be used as ___________.

None of these
A sawtooth generator
Am amplifier
A rectifier

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Power Electronics
Power electronics essentially deals with control of a.c. power at ___________.

Frequencies less than 10 Hz
50 Hz frequency
Frequencies above 1000 kHz
Frequencies above 20 kHz

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Power Electronics
An SCR has half cycle surge current rating of 3000 A for 50 Hz supply. One cycle surge current will be

 4242.64 A.
 1500 A.
 2121.32 A.
 6000 A.

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Power Electronics
What happen due to high di / dt?

 Insulation failure.
 Breakdown of junction.
 None of these.
  Local hot spot.

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