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If the resultant flux will not be in phase with the resultant mmf Fr. This is due to __________

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If the resultant flux will not be in phase with the resultant mmf Fr. This is due to __________

(a) hysteresis effect

(b) armature reaction

(c) hysteresis effect and armature reaction

(d) eddy currents

The question was asked in a job interview.

This question is from Phasor Diagram of a Cylindrical Rotor Alternator topic in chapter Synchronous Generators of Electrical Machines

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The correct choice is (a) hysteresis effect

Explanation: Hysteresis effect causes the flux to be lagging in nature.

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