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The speed range of a drive is

  • A.the ratio of its highest usable speed to its lowest
  • B.the difference between its no-load and its full-load speed
  • C.the accuracy with which it can hold a commanded speed
  • D.the time it takes to change from one speed to another

Answer: A

A drive quoted as 100 to 1 can be operated from full speed down to a hundredth of it while still meeting its torque and accuracy requirements. It is sometimes called the turndown ratio, and it says nothing about how accurately any particular speed is held.

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