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The circle diagram of an induction machine is a plot of

  • A.the torque against the slip over the whole range of operation
  • B.the efficiency against the output power of the machine
  • C.the magnetisation curve of the machine at standstill
  • D.the locus of the stator current as the slip varies

Answer: D

Because the equivalent circuit is a constant voltage across a series impedance whose resistive part varies, the current traces a circle in the complex plane. Torque, output, power factor and efficiency can all be read off it graphically.

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