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A motor's efficiency curve against loading is

  • A.constant at all loadings by design
  • B.fairly flat from about half load to full load and falling sharply below that
  • C.a straight line rising from zero load to full load
  • D.highest at no load and falling steadily as load is applied

Answer: B

Iron and friction losses continue whatever the shaft output, so at a quarter load they are a large share and the efficiency collapses. Above about half load the curve is broad, which is why loading anywhere in the upper half is acceptable.

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