Electrical Machines
Direction of rotation of DC motor is reversed by

 Adding resistance to field circuit.
 Reversing supply connection.
 Reversing armature connection or field connection.
 Interchanging armature and field connection.

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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 more with wave winding than with lap winding.
 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 depends on weather the machine is running as a motor or generator.

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