Q. Hard firing of a thyristor

A
Reduces TURN ON time
B
Reduces TURN OFF time
C
Increases TURN ON time
D
Has no significant effect on switching
Solution:

Hard firing refers to the process of turning ON a SCR using a gate pulse of magnitude several times higher than the minimum required gate current. Hard firing is used to reduce the turn ON time of SCR and also to improve the di /dt capability. Hard firing is also known as over driving.

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