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Auto Mechanics Paper 2,May/June 2008  
Questions:   1 2 3 4 5   Main
General Comments
Weakness/Remedies
Strength
























Question 2

(a) (i) Sketch a circuit diagram showing an earth return system on a motor vehicle.
(ii)  State two merits of the earth return system.

(b) State the purpose of colour coding in motor vehicle wiring.

(c) State the purpose of a fuse in an electrical circuit.

(d) State the voltage and effective capacity of two 12V 55 AH batteries connected in

  • series;
  • parallel.
_____________________________________________________________________________________________________
OBSERVATION

Though most of the candidates did not attempt this question, the few that attempted it could not sketch correctly the circuit diagram of an earth return system as asked in part (a)(i).

They could not also state the merits of an earth return system.  The correct circuit diagram of an earth return system is given below:

The merits of an earth return system include

  • it is more compact;
  • it uses fewer cables;
  • it reduces fire risk;
  • it is easy to trace faults;
  • it is cheaper and lighter in weight.
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