1. Explain the function of (i) Hydrometer (ii) High rate discharge tester.
(b) Mention two types of spark plug.
(c) Explain function of heater plug.
(d) Mention two types of heater plug.
2. (a) What are the causes of the following
(i) Open circuit
(ii) Short circuit
(b) Explain the importance of changing the engine oil at regular interval.
(c) Explain causes of oil lamp flashing on when an engine operate.
(d) What is the function of dipstick?
3. (a) List four importance of carrying out preventive maintenance on the tools, equipment and machine in the workshop.
(b) Define the following term
(i) Voltage drop
(ii) Cranking Voltage
(iii) Engine time
(iv) Firing order
4. (a) What is electrolyte?
(ii) Explain purpose of cut -out in charging system.
(b) List five electric circuit in the vehicle and explain the purpose of each circuit.
5. State the relative density of
(i) Fully charged battery
(ii) Discharged battery
6. (a) Explain the function of the following
(i) Knock sensor
(ii) Air flow sensor
(b) Explain the difference between hot sparkplug and cold spark plug.
(c) What is the ignition timing?
(d) Explain the difference between low tension and high tension lead in ana ignition system.
7. (a) List four advantage of electronic controlled petrol fuel system compared to carburetor petrol fuel.
(b) Explain the function of butterfly in the electronic fuel injection.
(c) What is the function of injector nozzle?
(d) Explain the function of manifold heaters.
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