Electrical Machines
The use of double squirrel cage winding on the rotor provides

 higher efficiency.
 low noise.
  a large starting torque.
 reduced starting torque.

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 increase in speed but armature currnet remains the same.
 increase in speed demanding more armature current.
 decrease in speed demanding less armature current.
 decrease in speed but armature current remains the same.

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