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Cold rolled grain oriented steel is used in transformer cores because it

  • A.requires no insulation between the laminations
  • B.has a low loss and a high permeability along the rolling direction
  • C.is very much cheaper than ordinary hot rolled sheet
  • D.has no hysteresis loss at any flux density

Answer: B

Aligning the crystal grains with the direction the flux will take reduces the loss and raises the permeability along that axis. Mitred corner joints are used so that the flux stays as nearly as possible in the favourable direction.

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