Power Electronics
Latching current for an SCR inserted between a dc voltage source of 200 V and load is 100 mA. Compute the minimum rate of width pulse required to turn ON the SCR in case load consists of R = 20 Ω in series with L = 0.2 H.

 150 µs.
 300 µs.
 200 µs.
  100 µs.

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Power Electronics
Delay time is defined by the interval when

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

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