Power Electronics
60 thyrsistors are connected in series and parallel to form a 10 KV and 5.5 KA switch. Each thyristor is rated for 1.2 KV, 1 KA. The no. of parallel path are 6. The efficiency of the switch is

 83.3 %.
  76.3 %.
 90.9 %.
 91.6 %.

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Power Electronics
Delay time is defined by the interval when

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

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