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With the machine's terminals shorted and its speed held at rated value, the curve that is recorded is one of

  • A.torque against the load angle with the terminals shorted
  • B.armature current against field current with the terminals shorted
  • C.terminal voltage against field current on open circuit
  • D.field current against speed at constant terminal voltage

Answer: B

It is essentially a straight line because the machine is unsaturated at short circuit, the flux being held down by the heavy demagnetising armature reaction. Its slope with the open circuit curve gives the synchronous impedance.

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