Power Electronics
A 200 A thyristor is to be operated in parallel with a 300 A thyristor. The ON state voltage drops are 1.5 V and 1.2 Volts. What is the value of resistance R to be connected in series with each thyristor, so that current through the combination is 500 A and each of them is fully loaded ?

 0.03 ohm
 3.0 ohm
  0.3 ohm
 0.3 ohm

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Power Electronics
Rise time is defined by the interval when

  both B and C.
 anode voltage drops from 90 % to 10 % of its initial value.
 anode current rises 10 % to 90 % of its final value.
 gate current rises from 90 % to 100 % of it final value.

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