Auto Electrical Works Paper 2, WASSCE (SC), 2018

Question 5

 

(a) Table 3 contains some symptoms of faults in the lighting system of a motor vehicle.
Table 3


Symptoms

Possible fault

Headlight out of correct aiming

(i)

(ii)

(iii)

Non-working lights

(i)

(ii)

(iii)

Dim lights

(i)

 

(ii)

 

(iii)

 
Complete Table 3 with three possible faults for each symptom. 

(b)        Fig. 4 is a diagram of a type of automobile bulb.


(i)         Identify the parts labelled L, M and N.
(ii)        State the purpose of the pins.
(iii)       State two areas in the lighting system of automobiles where the bulb is used.

 

Observation

 

(a)                                                                    Table 3


Symptoms

Possible fault

Headlight out of correct aiming

Faulty suspension

Damage to body panels

Loose fittings

Incorrect adjustment

Non-working lights

Blown bulbs

Blown/burnt fuse

Broken/loose wiring/connections

Relay not working

Corrosion in light units

Switch not making contact

Dim lights

Low current from battery

Loose battery terminal

Weak battery cell

High resistance in circuit

Low alternator output

Discoloured lens or reflectors

 

(b) (i)

L – glass envelope                                                    
M – filament/double filaments                                  
N – ground shell/earth
           
(ii)        To hold the bulb in place when fixed in lamp holder                                    

 (iii)      Two areas in the lighting system where the bulb is used

  • Brake light                       
  • Rear light
  • Head light

           
Majority of the candidates that attempted Question 5 showed a good understanding of the topic.