Electrical Machines
In electric locomotives which of the following motor are used ?

 Synchronous motor.
 DC series motor.
 DC Shunt motor.
 DC compound motor.

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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.
  by which electric current in a coil is reversed.
  in which magnetic field is set up.

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