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

 1.
 2.
 4.
  8.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

 Any of the above.
 Connecting an additional resistance in the field circuit.
 Connecting an additional resistance in the armature circuit.
 Connecting an additional resistance in stator circuit.

ANSWER DOWNLOAD EXAMIANS APP