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Power Electronics

Power Electronics
IGBT combines the advantages of

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

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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

 0.75.
  0.25.
 0.7.
 0.2.

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Power Electronics
After peak point, the UJT operates in the ___________ region.

Negative resistance
Saturation
Cut-off
None of these

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

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

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

Decreases
Increases
None of these
Essentially remains the same

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Power Electronics
A thyristor will be triggered when Vg = 1.5 volt and Ig = 100 mA in the given figure. Calculate the value of R in ohm is

 60.
  37.14.
 3.714.
 65.

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