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Electrical Machines

Electrical Machines
Equalizer rings are used in which of the followings?

 both 1 and 2
None of these
 lap winding
 wave winding

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Electrical Machines
The effect of ------------------ on main field flux is armature reaction?

 armature mmf
 armature flux
 armature current
All of these

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 20V
 200V
 10V
 100V

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

 over commutation.
  too rapid reversal of current.
  any of the above.
  under commutation.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running torque.
  efficiency.
  ratio of starting to running current.
  ratio of input to output voltage.

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Electrical Machines
If a shunt generator delivers 100 A at 200 V, and the resistances of the shunt field and armature are 100 ohms and 0.01 ohms respectively, the generator emf will be

  any one of the connection.
  parallel.
  no resistance is connected.
  series.

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