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Continuous overloading of a motor beyond its rating leads to

  • A.no consequence of any kind
  • B.deterioration of the insulation and shortened life
  • C.an immediate mechanical failure of the shaft or the bearings of the machine
  • D.an increase in the efficiency of the machine at its new operating point

Answer: B

Insulation ages chemically at a rate that roughly doubles for every ten degrees of excess temperature, so a modest overload can halve the machine's life. Failure is gradual rather than sudden, which is why the damage often goes unnoticed.

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