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 ?

 3.0 ohm
 0.3 ohm
 0.03 ohm
  0.3 ohm

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Power Electronics
Delay time is defined by the interval when

 anode voltage drops from 100 % to 90 % of its actual value.
 gate current increases from 90 % to 100 % of its final value.
  all of these.
 anode current reaches 10 % from forward leakage current.

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