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A 3-phase induction motor had the maximum rated torque of 40 N-m while the load torque applied to it is 55 N-m.

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A 3-phase induction motor had the maximum rated torque of 40 N-m while the load torque applied to it is 55 N-m.

(a) The machine will become unstable

(b) The machine will operate in stable region

(c) The machine will get heated up

(d) The machine will run at dangerously high speed

This question was posed to me in an online quiz.

This interesting question is from Induction Motor Phasor Diagram in portion Induction Machines of Electrical Machines

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Right choice is (a) The machine will become unstable

Explanation: Induction motor is unstable when the load torque is more the the maximum torque of the machine.

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