Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

None of these
  star.
  delta or star according to need.
  delta.

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Electrical Machines
Commutation in a DC machine may be explained as a process

 how alternate flux affects the main field flux.
 by virtue of which emf is induced in the armature conductors.
  in which magnetic field is set up.
  by which electric current in a coil is reversed.

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