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ELECTRICAL MACHINES

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

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

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Electrical Machines
The induction motor shaft is made of

  cast iron.
  aluminium.
  mild steel.
  stainless steel.

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Electrical Machines
The shaft of induction motor may be unbalanced due to

  uneven air gap.
  overload.
  overheating of winding.
  poor lubrication.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  720 to 920.
  500 to 720.
  375 to 500.

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Electrical Machines
Induction motors provided with open slots have

  leading power factor.
  less breakdown torque.
  more breakdown torque.
  higher efficiency.

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