Q.

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

A. 0 ≤  ≤ 180°
B. 0 ≤  ≤ 150°
C. 0 ≤  ≤ 120°
D. 0 ≤  ≤ 90°
Answer» B. 0 ≤  ≤ 150°
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