In an alternator, the armature winding is kept stationary while the field winding is kept rotating for the following reasons: 1. Armature handles very large current and high voltage 2. Armature fabrication, involving deep slots to accommodate large coils, is easy if armature is kept stationary 3. It is easier to cool the stator than the rotor Which of the above reasons are correct?

Option 4 : 1, 2 and 3

In an alternator, armature winding is kept stationary (provided on stator) and field winding is kept rotating (on the rotor) because of the following reasons.

• Armature winding handles large voltages. So, the insulation is easy for stationary winding.
• Cooling of the winding is more efficient
• It is economical and efficient
• Armature fabrication is easy from the mechanical stability point of view
• Higher peripheral speed can be achieved in the rotor
• The rotor is lighter and low centrifugal forces
• The output current can be easily supplied to the load circuit
• Only two slip rings are required to give DC supply to the field system