Electrical Machines
Scott connections are used for

 three phase to single phase transformation.
 any of the above.
 single phase to three phase transformation.
 three phase to two phase transformation.

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

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