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

 6, 4.
 4, 6.
 5, 7.
  7, 5.

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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.
 anode current reaches 10 % from forward leakage current.
  all of these.

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