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Nameplate data is used in an audit with caution because it gives

  • A.the manufacturer's price rather than the installed cost
  • B.the efficiency at full load only
  • C.the consumption in units the bills do not use
  • D.the rated rather than the actual operating condition

Answer: D

A 30 kW motor driving a load of 12 kW consumes nothing like its rating, and assuming otherwise overstates both the consumption and the saving from replacing it. The nameplate identifies the machine and bounds its capability; measurement establishes what it is doing.

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