Discussion
An oversized motor costs energy chiefly because it runs
Answer: D
Correct answer: at part load, where its efficiency and power factor are poorer
A motor’s efficiency curve is reasonably flat from about half load to full load and falls away sharply below that, and the power factor falls much faster still, because the magnetising current is drawn whatever the load. An oversized machine therefore spends its life on the part of the curve where both are worst. It does not run faster or hotter - if anything it runs cooler and closer to synchronous speed.
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