Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 short circuit and slip tests.
 open circuit and zero power factor tests.
 zero power factor and slip tests.
 open circuit and short circuit tests.

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 increase in speed but armature currnet remains the same.
 decrease in speed but armature current remains the same.
 decrease in speed demanding less armature current.
 increase in speed demanding more armature current.

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