An SCR is controlling DC voltage to a light If the light rem

An SCR is controlling DC voltage to a light. If the light remains on after the gate pulse has been removed, then

a) the scr is faulty

b) the light is faulty

c) the power is off

d) this is normal operation

Solution

option (d) is correct

It is the basic operation of scr that it continues to conduct once turned ON by gate a pulse even the gate is removed after scr coming into forward conduction mode till scr current reaches below holding current , which is done by a commutation circuitry.