Thyristor T1 is triggered at an angle α (in degree), and T2 at angle 180° + α, in each cycle of the sinusoidal input voltage. Assume both thyristors to be ideal. To control the load power over the range 0 to 2 kW, the minimum range of variation in α is: (Assume that the load is inductive load)

• A. 0° to 60°
• B. 0° to 120°
• C. 60° to 120°
• D. 60° to 180°