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For a DC motor, what is the output power equation?

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For a DC motor, what is the output power equation?

(a) Output power = Generated Power / efficiency

(b) Output power = Generated Power * efficiency

(c) Output power = Generated Power

(d) Output power = Generated Power + efficiency

The question was posed to me at a job interview.

The question is from Design of Output Equations topic in portion Thermal Design Aspects of Electrical Machines & D.C of Design of Electrical Machines

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Correct answer is (c) Output power = Generated Power

Easy explanation: Output power = Generated Power / efficiency – For DC Generator

Output power = Generated Power – For DC Motor.

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