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The international efficiency classes for induction motors are designated

  • A.IE1 to IE5, IE5 being the most efficient
  • B.IE1 to IE5, IE1 being the most efficient
  • C.A to G, A being the most efficient
  • D.class 1 to class 4, class 1 being the most efficient

Answer: A

The number rises with efficiency, so IE3 premium efficiency exceeds IE2 high efficiency, and many jurisdictions now prohibit the sale of the lower classes. The lettered scale belongs to appliance labelling rather than to motors.

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