Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 shunt field connections.
 series field connections.
 armature connections.
 armature or field connections.

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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 same as long as the flux density in the air gap remains the same.
  Armature emf is more with wave winding than with lap winding.
 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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