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If the 3-phase alternator has 4 poles and has synchronous speed of 120 rad/s. Then the mechanical speed in rad/sec is?

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If the 3-phase alternator has 4 poles and has synchronous speed of 120 rad/s. Then the mechanical speed in rad/sec is?

(a) 60

(b) 240

(c) 120

(d) 30

This question was addressed to me in an interview.

The question is from Physical Concepts of Synchronous Machine Operation topic in portion Synchronous Machines of Electrical Machines

1 Answer

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Best answer
The correct option is (a) 60

The best explanation: Mechanical speed = electrical speed*2/Number of Poles.

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