Electrical Machines
Which of the following machine will have maximum efficiency?

 DC motor.
 Electrical power generator.
 Induction motor.
  Electrical power transformer.

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Electrical Machines
Compensating windings are used in DC generators

  mainly to reduce the eddy currents by providing local short circuit.
  to neutralize the cross magnetizing effect of the armature reaction.
  to provide path for the circulation of cooling air.
None of these

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Electrical Machines
Where the shunt generators are widely used?

 Where often load fluctuation is occurred.
 Where the load is very high.
 Where voltage variation is needed over a wide load range.
  Where a constant voltage is required over a narrow load range.

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Electrical Machines
The 3 - Φ induction motors are, by a very considerable margin, the most widely used AC motors as

  they have maximum efficiency and maximum starting torque.
  they are capable of operation under range of leading and lagging pf.
  these are cheaper in cost, simple and rugged in construction.
  they have very good speed regulation.

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