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The satisfactory operation of the synchronous machine means ___________

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The satisfactory operation of the synchronous machine means ___________

(a) mechanical speed of rotor is equal to stator field speed

(b) mechanical speed is zero

(c) stator field is stationary

(d) none of the mentioned

The question was posed to me in a national level competition.

Origin of the question is Hunting and Damper Windings topic in chapter Synchronous Machine Stability of Electrical Machines

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Best answer
Right option is (a) mechanical speed of rotor is equal to stator field speed

For explanation: The relative speed should be zero between the rotor and the stator field.

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