Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve efficiency.
  reduce copper loss.
  improve power factor.
  improve starting torque.

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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

None of these
  the machine will share load equally.
  the machine with more drooping characteristic will supply less load.
 the machine with more drooping characteristic will supply more load.

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