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Which core material has the highest permeability, low exciting current, low errors, and saturation at a relatively low flux density?

  • Copper
  • Aluminum
  • Cold-rolled grain-oriented silicon steel
  • Nickel-iron(77% Ni, 14% Fe (correct)
  • Which core material has a high permeability, high saturation level, reasonably small exciting current, and low errors?

  • Aluminum
  • Copper
  • Nickel-iron(77% Ni, 14% Fe
  • Cold-rolled grain-oriented silicon steel (correct)
  • Up to what current rating does the core material made from nickel-iron alloy have reasonably good accuracy?

  • 30 times the rated current
  • 10-15 times the rated current (correct)
  • 5 times the rated current
  • 20 times the rated current
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