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For the effective electromechanical energy conversion in the device, the developed torque depends upon __________

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For the effective electromechanical energy conversion in the device, the developed torque depends upon __________

(a) stator field  and torque angle

(b) stator field and rotor field

(c) stator field and rotor field and the torque angle

(d) stator field  only

This question was posed to me in unit test.

My question is from Power Angle Characteristics of Synchronous Machines in portion Synchronous Machines of Electrical Machines

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Best answer
Right choice is (c) stator field and rotor field and the torque angle

Explanation: T α E*V*sinδ.

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