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The operating frequency and voltage of an isolated alternator ________ if the prime mover input to motor is increased.

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The operating frequency and voltage of an isolated alternator ________ if the prime mover input to motor is increased.

(a) increases

(b) decreases

(c) remains constant

(d) no relation exists between the power and frequency

I had been asked this question in an interview for job.

This interesting question is from Power Factor Control of Synchronous Machines in section Synchronous Machines of Electrical Machines

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Best answer
Correct option is (a) increases

For explanation: By varying the prime mover torque, the load angle as well as the operating frequency also get affected.

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