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The two tests needed to construct the circle diagram are

  • A.the no-load and blocked rotor tests
  • B.the open circuit and short circuit tests of a transformer
  • C.the retardation test and the brake test on the machine
  • D.the polarity test and the insulation resistance test

Answer: A

They fix the two extreme points of the locus, the no-load point at nearly zero slip and the blocked-rotor point at unity slip. The circle through them, with its centre on a line determined by the geometry, completes the construction.

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