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Power Electronics

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

 3.714.
  37.14.
 60.
 65.

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Power Electronics
Which following is a two terminal three layer device?

 BJT.
 None of above.
  Power dioed.
 MOSFET.

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Power Electronics
The typical value of SCR for modern alternator is

 1.5.
 0.5.
 1.0.
 1.2.

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Power Electronics
Which triggering is the most reliable?

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

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

 100 A.
  150 A.
 110 A.
 120 A.

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Power Electronics
What happen due to high di / dt?

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

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