Observation

      The expected answers were:

(a)Diagram of full-wave bridge rectifier

(b) Factors that determine the strength of current generated by an alternator

• Field strength
• Number of turns of coil/conductor
• Relative motion between the conductor and the magnetic flux.       

                                         
(c) (i) Types of generator used in a motor vehicle

• d.c. generator/dynamo
• a.c. generator/alternator                                                                        

    (ii) Parts of an alternator

• fan
• stator/coil
• bearing
• rotor
• rectifier pack
• slip rings
• pulley
• end plate
• brush gear
• bushing
• brushes
• diode

To obtain maximum mark in the (a) part, candidates were required to give correct arrangement of four diodes and connecting wires.