Electrical Machines
In a DC machine, for the same value of φ, Z and N; which one of the following statements is correct?

 Armature emf is same as long as the flux density in the air gap remains the same.
 Armature emf is less with wave winding than with lap winding.
  Armature emf is more with wave winding than with lap winding.
 Armature emf depends on weather the machine is running as a motor or generator.

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

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

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