Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie under south pole.
 lie under north pole.
 there is no hard and fast rule for this.
 lie in the inter polar gaps.

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Electrical Machines
In a synchronous generator with constant steam input supplies power to an infinite bus at a lagging power factor. If the excitation is increased

 both power angle and power factor decrease
 both power angle and power factor increase
 power angle increase and power factor decrease
 power angle decrease and power factor increase

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

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

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Electrical Machines
The factors that are responsible for decrease in terminal voltage of a shunt generator are

 armature resistance, inter poles, armature.
  armature resistance, effect of armature reaction.
 armature resistance, effect of armature reaction.
  reduction in field current, effect of armature reaction, armature.

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