OBSERVATION

The expected responses were:
(a)     Parts of an alternator.

1. The main winding (stator).
2. The Rotor.
3. The slip rings and the carbon brushes.
4. Field winding.
5. Poles.
6. Yoke.

1. 4-pole, three-phase inductor motor, 415 V. 50 Hz three-phase supply.
2. percentage slip when the motor is running at 1450 rev/min,

synchronous speed of the motor
                                                        

Ns = 1500rev/mins                                             
The fractional slip; S                                        

                                     

 or Slip =3.33%                
                                                                                                                

1. motor speed when the slip is 6%

Some of those who attempted this question listed 3 parts and did some of the calculations correctly while others did not. Many did not put the unit for each answer.