Power Electronics
A thyristor string is made of a no. of SCR connected in series and parallel. The string have volume and current of 11 KV and 4 KA. The voltage and current rating of available SCRs are 1800 V and 1000 A. For a string efficiency of 90 % let the number of SCRs in series and parallel are a and b respectively. Then the value of a and b will be

  7, 5.
 6, 4.
 5, 7.
 4, 6.

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Power Electronics
Rise time is defined by the interval when

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

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