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Variation in the dc excitation of a synchronous motor causes variation in ___________

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Variation in the dc excitation of a synchronous motor causes variation in ___________

(a) armature current and power factor

(b) power factor

(c) armature current

(d) speed

The question was posed to me in semester exam.

Question is from Synchronizing Power and Synchronizing Torque in division Synchronous Machine Stability of Electrical Machines

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The correct option is (a) armature current and power factor

The explanation: Armature current and power factor both will vary by varying the dc excitation.

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