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The ratio of starting torque to full-load torque of an ordinary cage machine is typically

  • A.about ten
  • B.less than a tenth
  • C.exactly equal to the ratio of maximum to full-load torque
  • D.between one and two

Answer: D

It is enough for a fan or a pump but marginal for a fully laden conveyor, which is why high-torque designs and wound rotor machines exist. Reduced-voltage starting cuts it by the square of the voltage ratio, which is the usual difficulty.

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