When the firing angle $$\alpha $$ of a single phase, fully controlled rectifier feeding constant $$d.c.$$ current into a load is $${30^ \circ }$$ , the displacement power factor of the rectifier is

In a commutation circuit employed to turn off an $$SCR$$, Satisfactory turn-off is obtained when.

The $$MOSFET$$ switch in its on - state may be considered equivalent to

Series capacitive compensation in $$EHV$$ transmission lines is used to