Auto Electrical Works Paper 2, WASSCE (SC), 2017

Question 5

 

  • (a) Draw a double filament bulb used in vehicle and label any two parts of it.
    (b) Give:
    (i) one advantage of light emitting diode over filament lamp in a motor vehicle;
    (ii) two reasons why headlamps are important in a motor vehicle.
    (c) Categorize the following into obligatory and non-obligatory lights.
    (i) Parking light
    (ii) Number plate light
    (iii) Inner light
    (iv) Door light

Observation

 

a) Diagram of a double-filament bulb used in vehicle




(b) (i) Advantages of light emitting diode over filament lamp in motor vehicle

  • To save energy.
  • Long life span.
  • Brighter illumination.

      (ii) Reasons why headlamps are important in a motor vehicle

  • Main beam enables the driver to maintain a reasonable speed at night.
  • It is adjustable to prevent dazzling of the driver of approaching vehicle.
  • Full scale illumination is required to pick up side road.
  • Enables other road users to see oncoming vehicle.                                                                                    

 

 (c) Categories of lights

 


Obligatory light

Non-obligatory light

Parking light

Number plate light

 

Inner light

 

Door light

 

To obtain maximum mark in the (a) part, candidates must produce a good diagram/sketch and give correct labeling of any two parts. Response of candidates to this question was average