Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 zero , - 50 rpm.
 zero, 950 rpm.
 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.

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

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

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