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

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Electrical Machines
Slip speed is the

  difference of synchronous speed and actual rotor speed.
  difference of actual rotor speed and synchronous speed.
  sum of synchronous and rotor speeds.
  half of the sum of synchronous and rotor speeds.

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