Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as

  they have very good speed regulation.
  these are cheaper in cost, simple and rugged in construction.
  they have maximum efficiency and maximum starting torque.
  they are capable of operation under range of leading and lagging pf.

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

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