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At steady state operation in a 3-phase synchronous generator. (where Tem is developed electromagnetic torque developed in the machine and Tpm is the prime mover torque.)

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At steady state operation in a 3-phase synchronous generator. (where Tem is developed electromagnetic torque developed in the machine and Tpm is the prime mover torque.)

(a) Tem = Tpm

(b) Tem > Tpm

(c) Tem < Tpm

(d) can not be coupled

This question was posed to me in examination.

I want to ask this question from Physical Concepts of Synchronous Machine Operation in portion Synchronous Machines of Electrical Machines

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Right choice is (a) Tem = Tpm

Best explanation: At steady state the net torque is zero in the machine.

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