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Motors are commonly found oversized because

  • A.each stage of the design added a margin
  • B.smaller motors were unavailable when the plant was built
  • C.the load has grown since the plant was commissioned
  • D.the tariff formerly rewarded a larger connected load

Answer: A

The process engineer adds a margin, the pump supplier adds another and the electrical contractor rounds up to the next frame size, and the compounding leaves a machine at a third of its rating. Measuring the actual load is the first step in correcting it.

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