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The coupling angle or load angle of a synchronous motor is defined as the space angle between __________

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The coupling angle or load angle of a synchronous motor is defined as the space angle between __________

(a) rotor and stator poles of opposite polarity

(b) rotor and stator poles of same polarity

(c) rotor and stator teeth

(d) rotor and resultant magnetic field

This question was posed to me in an interview for internship.

My question is based upon Synchronizing Power and Synchronizing Torque topic in section Synchronous Machine Stability of Electrical Machines

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Correct option is (a) rotor and stator poles of opposite polarity

For explanation: It is measured between stator and rotor poles of opposite polarity.

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