Discussion
True or false: single-phase induction motors hum more than three-phase machines.
Answer: D
Correct answer: True, because of the double-frequency torque pulsation
A single-phase machine’s instantaneous power pulsates at twice supply frequency, and so does its torque, since there is no second and third phase to fill the gaps. That pulsation shakes the machine and its mounting at 100 hertz on a 50 hertz supply. A three-phase machine has a constant instantaneous power and is correspondingly quieter.
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