Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply frequency
 supply voltage
 rotor resistance
None of these

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

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