In a single-phase voltage controller with RL load, ac output

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In a single-phase voltage controller with RL load, ac output power can be controlled if—

1. firing angle α > φ (load phase angle) and conduction angle γ = π
2. α > φ and γ < π
3. α < φ and γ = π
4. α < φ and γ > π

Correct Option: B

NA