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

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

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Electrical Machines
Cogging in induction motor occurs when

 number of stator teeth - number of rotor teeth = odd number.
 number of stator teeth - number of rotor teeth = negative number.
 number of stator teeth - number of rotor teeth = even number.
 number of stator teeth - number of rotor teeth = 0.

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