Question 5
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(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