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Electrical Machines

Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 120 V
 175 V
 140 V
 240 V

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Electrical Machines
Damper winding is used to

 both 1 and 2.
 increase the load current.
 decrease the load current.
 suppress the hunting.

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Electrical Machines
Larger values of air flux density is taken while designing IM for

  none.
  larger output.
  both.
  larger bore diameter.

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Electrical Machines
Which of the following is/are effects of armature reaction?

All of these
 increase the maintenance and repair
 increase the iron loss
 increases the design cost

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  along field axis.
  along neutral axis.
  in none of above positions.
  in any of above positions.

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Electrical Machines
Copper brushes in DC machine are used

None of these
 where high voltage and low current.
 in both of above cases.
 where low voltage and high currents are involved.

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