Q.48 In AC voltage controller shown below. Thyristor 
is fired at α and 
is fired at 
.To control the output power over range 0 to 2 kW. The minimum range of variation in
is
(A) 0° to 60°
(B) 0° to 120°
(C) 60° to 120°
(D) 60° to 180°#
Answer:(D)
Explanation:
Not Required.
