Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
None of these
 Cylindrical rotor.
 Both type rotor.

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

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

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