Electrical Machines
If dimension of all the parts of a synchorous generator and the number of field and armature turns are double, then generated voltage will change by a factor of

  8.
 4.
 1.
 2.

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Electrical Machines
The speed of a DC series motor is

 Proportional to the armature current.
 Inversely proportional to the armature current.
 Proportional to the square of the armature current.
 Proportional to field current.

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