Power Electronics
If a latching current for the circuit shown in figure is 2 mA. Obtain the value of minimum width of the property turn ON the SCR?

 3 µs.
 3.1 µs
  3.3 µs
 3.2 µs

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Power Electronics
An SCR is considered to be a semi controlled device because

 it can be turned OFF but not ON with a gate pulse.
 it can be turned ON but not OFF with a gate pulse.
 it conducts only during one half cycle of an alternating current wave.
 it can be turned ON only during one half cycle of an AC.

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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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