Discussion
A brake test on a dc machine measures the output by
Answer: A
Correct answer: applying a mechanical brake and measuring the torque and speed
In a brake test a rope brake or dynamometer absorbs the mechanical output, and the torque is found from the net force on the brake and its radius. The output is then \( 2\pi NT/60 \), and the efficiency follows from the electrical input. It is a direct measurement rather than a computation, which is its merit; its drawbacks are that all the output is dissipated as heat, which limits it to small machines, and that the brake must be cooled.
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