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A machine designer finds the iron loss of a core higher than predicted after assembly. A likely cause is

  • A.the flux density being lower than the design value
  • B.burrs at the lamination edges shorting them together
  • C.the laminations being thinner than specified
  • D.the silicon content of the steel being higher than specified

Answer: B

A burr from the punching operation can bridge several laminations and let eddy currents circulate over a much larger area than intended. Deburring and edge insulation are routine parts of core manufacture for exactly this reason.

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