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If an emf at slip frequency is injected at an angle α with existing rotor induced emf, then the ___________

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If an emf at slip frequency is injected at an angle α with existing rotor induced emf, then the ___________

(a) power factor only improves

(b) speed changes

(c) power factor improves and speed changes

(d) power factor worsens and speed changes

I have been asked this question at a job interview.

This question is from Starting of Polyphase Induction Motors-II topic in portion Starting of Induction Motors of Electrical Machines

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Correct choice is (a) power factor only improves

Explanation: Power factor increases as the net angle decreases.

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