Electrical Machines
Which of the following motors is/are widely used?

 either of these
None of these
 squirrel cage induction motor
 slip ring induction motor

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

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