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

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

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Electrical Machines
Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between

 Rotor mmf wave and resultant flux density wave.
 Stator mmf wave and resultant flux density.
  Rotor mmf wave and stator mmf wave.
 Stator mmf wave and resultant mmf wave.

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