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The power load angle characteristic as maximum for a load angle of __________

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The power load angle characteristic as maximum for a load angle of __________

(a) 90°

(b) 45°

(c) more than 90°

(d) 180°

The question was asked in a national level competition.

I want to ask this question from Physical Concepts of Synchronous Machine Operation in section Synchronous Machines of Electrical Machines

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Best answer
Right answer is (a) 90°

Explanation: As per the parabolic graph, the maxima is obtained at 90°.

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