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In a 3 phase full wave regulator feeding resistance load connected in star, the possible range of firing angle a is

0 ≤ a ≤ 180°
0 ≤ a ≤ 150°
0 ≤ a ≤ 120°
0 ≤ a ≤ 90°

Correct Answer: 0 ≤ a ≤ 150°

Explanation:

Since output voltage is zero if a ≥ 150°, the possible range of firing angles is 0 ≤ a ≤ 150°.

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