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Thyristor $T_{1}$ is triggered at an angle $\alpha$ (in degree), and  $T_{2}$ at an angle $180^{\circ}+\alpha$, 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 $\alpha$ is:

  1. $0^{\circ}$ to $60^{\circ}$
  2. $0^{\circ}$ to $120^{\circ}$
  3. $60^{\circ}$ to $120^{\circ}$
  4. $60^{\circ}$ to $180^{\circ}$
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