Electrical Machines
The armature shaft must be able to with stand

 Any unbalanced magnetic pull on the armature core.
All of these
 Twisting stains due to transmission of torque.
 Bending moment due to weight of the armature.

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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 depends on weather the machine is running as a motor or generator.
  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.

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