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 Auto Mechanics Paper 2,Nov/Dec 2008.
 Questions: 1 2 3 4 5 Main
Weakness/Remedies
Strength

Question 5

(a) State three areas where friction is used as an advantage in the operation of a motor vehicle.
(b) Calculate the current taken by a 60 watt headlamp bulb when used with a 12 volt electrical supply.
(c) State one function of each of the following in an engine:
(i) heater plug;
(ii) lift pump;
(iii) injector.

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OBSERVATION

Over 90% of the candidates attempted this question.  Most of the candidates got right the calculation in part (b) pf the question.  However some of the candidates could not state the formula for current as I =  V
R
Due to lack of knowledge, part (c) was poorly responded to by a large number of the candidates.  The correct answers are:

• heater plug – preheats the indirect C.I engine combustion chamber before starting the engine.
• Lift pump – supplies fuel from the tank to the injector pump or carburettor.
• Injector – breaks and atomizes the diesel fuel.