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The standard secondary current of a current transformer is

  • A.0.1 A
  • B.5 A or 1 A
  • C.10 A
  • D.the same as the primary current

Answer: B

Standardising the secondary means any instrument may be used with any transformer of the same class. Five amperes is the traditional value; one ampere is preferred where the leads to the instrument are long, since the burden of the leads then falls by a factor of twenty-five.

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