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Discussion

A stepped pulley and belt arrangement gives

  • A.a small number of fixed speed ratios
  • B.continuously variable speed over a wide range
  • C.constant power at every ratio available
  • D.speed control without any loss of efficiency at all

Answer: A

Moving the belt between pulley steps changes the ratio in discrete jumps, which is adequate for a bench lathe or a drill press. It is cheap and efficient at each ratio but cannot be adjusted while running or under load.

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