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

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

 increases in generators but decreases in motor with load.
 increases in both the generators and the motors with load.
 decreases in generators and increases in motor with load.
  decreases in both generators and the motors with load.

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