Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 commutator
 armature winding
 field winding
 starters

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Electrical Machines
With the increase in speed of DC motor

 Both back emf as well as line current fall.
  Back emf increase but line current falls.
 Back emf falls and line current increase.
 Both back emf as well as line current increase.

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Electrical Machines
A 10 kW, 230 V, dc shunt machine has four terminals brought out through four leads. For this machine

 armature winding has thick leads whereas field winding has thin leads
 both the windings have thin leads
 both the windings have thick leads
 armature winding has thin leads whereas field winding has thick leads

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