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for a 3 phase 315V alternator having impedance angle of 60 degree, the required load angle for the maximum power input to the generator is _______

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for a 3 phase 315V alternator having impedance angle of 60 degree, the required load angle for the maximum power input to the generator is _______

(a) 120°

(b) 60°

(c) 150°

(d) 30°

This question was posed to me in an online interview.

My question comes from Power Flow Through an Inductive Impedance topic in division Efficiency and Regulation of Electrical Machines

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Best answer
Right option is (a) 120°

Easiest explanation: δ = 90+α = 2α+θ=180-θ

              So  δ = 180-60=120°.

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