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Power Electronics

Power Electronics
ON state voltage drop across SCR lie between the range

 1.5 - 2 V.
 0 - 0.5 V.
 0.5 - 1 V.
  1 - 1.5 V.

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Power Electronics
A single phase one pulse controlled circuit has a resistance R and counter emf E load 400 sin(314 t) as the source voltage. For a load counter emf of 200 V, the range of firing angle control is

 60° to 180°.
 30° to 180°.
 30° to 150°.
 60° to 120°.

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Power Electronics
Thermal voltage VT can be given by

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

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Power Electronics
Which one is most suitable power device for high frequency (>100 KHz) switching application?

  Power MOSFET.
 Schottky diode.
 Microwave transistor.
 BJT.

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

 GTO.
  IGBT.
 FCT.
 MCT.

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Power Electronics
A string of n parallel SCRs is operated at 72 KA, the rating of each SCR is 1 KA. If derating factor of the string is 0.1. Then calculate the value of n

 70.
 60.
  80.
 90.

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