Electrical Machines
Which of these types of motor is used in elevators?

 DC shunt motor.
 DC compound motor.
 None of these.
 DC series 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.
 Connecting an additional resistance in the armature circuit.
 Any of the above.

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