Electrical Machines
In DC generators brushes are used for

 collecting of voltage
 reduce eddy current loss
 collecting of current without any sparkings
 convert ac armature current in to dc

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Electrical Machines
For a single phase capacitor start induction motor which of the following is valid?

 Direction of rotation cannot be changed.
  Rotation can be changed by reversing main winding terminals.
 None of these.
 Rotation can be changed by interchanging supply terminals.

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 B is bigger than A for the same current rating
 both are of the same size for the same current rating
 A is bigger than B for the same current rating
 A is bigger than B for the same voltage rating

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