Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 4/P*θmech
 θelec = θmech
 θelec = 2/P*θmech
 θelec = P/2*θmech

ANSWER DOWNLOAD EXAMIANS APP

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

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

ANSWER DOWNLOAD EXAMIANS APP