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Power Electronics

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

 MOSFET.
 BJT.
  Power dioed.
 None of above.

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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.
 2121.32 A.
 1500 A.
 6000 A.

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Power Electronics
Dynamic equalising circuit is useful

 to limit di / dt of SCR.
 for voltage equalisation.
 to limit dV / dt of SCR.
  both B and C.

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Power Electronics
CB used for over current protection of thyristor operates when the fault current is

 neither (A) nor (B).
 both (A) and (B).
 of short duration.
  of long period.

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Power Electronics
A modern power semiconductor device that combines the characteristic of BJT and MOSFET is

 FCT.
 GTO.
  IGBT.
 MCT.

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Power Electronics
Thermal voltage VT can be given by

 qT/K.
  Kq/T.
 KT/q.
 (K2/q)(T + 1/T - 1).

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