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When an alternator is loaded suddenly the torque produced in damper is?

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When an alternator is loaded suddenly the torque produced in damper is?

(a) Induction motor

(b) Induction generator

(c) Synchronous motor

(d) Synchronous generator

I got this question in an international level competition.

Enquiry is from Hunting and Damper Windings topic in chapter Synchronous Machine Stability of Electrical Machines

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The correct option is (a) Induction motor

Explanation: Sudden loading will reduce the speed of the machine and so there will be small slip induced in the machine, making it operate as induction motor.

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