Question

The active power delivered by an alternator will _______ when the prime mover input is increased for the alternator connected to infinite bus bar.

(a) increases

(b) decreases

(c) remains constant

(d) no relation exists between the power and  prime mover droop characteristic

The question was asked in quiz.

The doubt is from Power Factor Control of Synchronous Machines in portion Synchronous Machines of Electrical Machines

Answer 1

The correct answer is (a) increases

To explain: The load angle will increase and so the real power will increase in case the prime mover input is increased.