Question 4
(a) Sketch an engine oil dipstick and indicate the correct markings on it.
(b) State two reasons why the crankcase of a motor vehicle engine is ventilated.
(c) List three types of radiator core used on the motor vehicle.
(d) State the function of each of the following:
(i) thermostat;
(ii) pressure cap.
Observation
This question did not pose much problem to the candidates who attempted it. The problematic parts were parts (b) and (c). The required responses to these parts are:
(b) Reasons why the crankcase is ventilated
- To prevent pressure build up;
- To allow the escape of harmful gases;
- To avoid contamination of the engine oil.
(c) Types of radiator core
- Tube type;
- Gill tube type;
- Film type;
- Cross flow type or horizontal type;
- Vertical flow type;
- Commercial type.