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

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

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Electrical Machines
The speed of a DC series motor is

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

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