Electrical Machines
When two DC series motors are connected in parallel, the resultant speed is

 zero.
 normal speed.
 less than normal speed.
 more than normal speed.

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

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

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