Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  star.
  delta or star according to need.
  delta.
None of these

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Electrical Machines
In a dc generator operating on load with its brushes on the geometrical neutral axis (GNA), the magnetic neutral axis (MNA) is shifted in the direction of rotation. Now, if the brushes are given a lead of 90° (electrical), then the MNA will

 shift forward by more than 90°
 shift forward by less than 90°
 shift forward by 90°
 coincide with the GNA

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