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Power Electronics

Power Electronics
If holding current of a thyristor is 2 mA then latching current should be

 0.009 A.
 0.01 A.
  0.004 A.
 0.002 A.

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Power Electronics
A single phase full bridge inverter can operate in load commutation mode in case load consists of

 RLC overdamped.
 RLC critically damped.
 RL.
  RLC underdamped.

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Power Electronics
Switching frequency of SITH is

  100 KHz.
 5 KHz.
 10 KHz.
 60 KHz.

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Power Electronics
Let of a thyristor Vc1, Vc2, Vc3 are forward break over voltage for gate current Ig1, Ig2, Ig3 respectively. Then

  Vc1 > Vc2 > Vc3 when Ig1 < Ig2 < Ig3.
 Vc1 = Vc2 = Vc3 any value of Ig.
 Vc1 > Vc2 > Vc3 when Ig1= Ig2
 Vc1 > Vc2 > Vc3 when Ig1 > Ig2 > Ig3.

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Power Electronics
Dynamic equalising circuit is useful

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

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

  Power MOSFET.
 BJT.
 Schottky diode.
 Microwave transistor.

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