EDUCATIONAL SERVICES LTD

Transcription

1 EDUCATIONAL SERVICES LTD Accredited and registered provider Unit Standard: AURTTC2001

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3 1. Please circle T or F to indicate whether each of the following statements is true or false: T F Heat always flows from hot to cold Heat will not cause a change of state in a liquid T T When heat is removed it can cause a substance to contract Heat can change the colour of metals 2. Match up the heat transfer term with its most appropriate description: Conduction Convection Radiation Transfer of heat by direct contact Transfer of heat by movement of warmed liquid Transfer of heat across space 3. What is the function of the engine cooling system? The function of the engine s cooling system is to remove excess heat from the engine, to keep the engine operating at its most efficient temperature, and to get the engine up to the correct temperature as soon as possible after starting. 4. Explain how air flow principles apply to the operation of DIRECT air cooling systems. Direct air cooled systems rely on draught air to maintain a constant operating temperature. The draught air disperses heat that is generated by the engine. 5. Provide ONE example of possible engine damage that could occur if not enough heat is removed from the engine and the engine temperature gets too hot. Any of the following: Blown head gasket Damaged hoses Seized engine Cracked cylinder head Friction damaged engine bore and piston 3

4 6. Identify four instances of poor practice in the following scenario: 1 Radiator cap was removed too early 2 Coolant leaking on to workshop floor 3 Forgot to fit radiator cap before test drive 4 Hosing coolant into storm water drain 7. Name two types of cooling system fans that are used on indirect cooling systems. Flex fan Thermostatic fan (variable speed fan) Electric fan 8. Which FOUR of the following components should be inspected when carrying out a service on a DIRECT air cooled engine? Please tick the appropriate boxes. Cooling fins Fan Shroud Ducting 9. Which TWO of the following statements is true? Please tick the appropriate box. Direct air cooled systems are more difficult to determine when the engine is overheating than indirect cooling systems. Air blowers are mechanical devices that can be used to cool stationary engines. 10. Identify each of the following components and outline its main use. A: Component: Reservoir tank Use: To receive hot coolant from radiator and return it when the temperature of the coolant drops B: Component: Water pump Use: Helps to circulate coolant around the cooling system 4

5 C: Component: Temperature Sender Unit Use: To electrically send coolant temperature to the temperature gauge 11. Match up each cooling system component with its description: For example A Radiator = 8 Allows hot coolant to be exposed to an air stream A Radiator A8 1 Used to connect the engine and the water pump to the radiator. B Cooling fins B12 2 Holds the coolant in the radiator under set pressure C Shrouds C5 3 Draws air through the radiator to cool the coolant D Anti freeze D10 4 Allows the coolant to circulate through the engine block and cylinder head E Radiator cap E2 5 Direct air to the hottest engine components F Oil cooler F11 6 Allows the engine to warm up quickly and then maintains optimum operating temperature G Radiator hose G1 7 Is driven by the crankshaft and drives the water pump and other accessories H Drive belts H7 8 Allows hot coolant to be exposed to an air stream I Cooling fan I3 9 Used to seal the casting holes in the engine block and pop out if coolant freezes J Thermostat J6 10 Mixture of water and ethylene glycol K Water jackets K4 11 Used to maintain operating temperature of automatic transmission L Frost plugs L9 12 Dissipate heat created in a direct air cooled engine 5

6 12. What is the correct name of the law that deals with the correct disposal of coolant? Please circle A, B, C or D. B The Resource Management Act 13. Which of the following is the correct method of disposal for coolant? Please circle A, B, C or D. D Coolant to be disposed of in a container ready for collection and recycling. 14. Describe the procedure involved in testing coolant. 1. Using a hydrometer take a sample form the radiator when cold 2. Hold the hydrometer at eye level and take the reading 3. Compare this reading to the manufacturers specifications and adjust as necessary 15. Which TWO of the following statements are true? Please tick the appropriate boxes. Coolant can help prevent corrosion. A high specific gravity reading indicates more anti freeze than water in the coolant. 6

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8 EDUCATIONAL SERVICES LTD Accredited and registered provider 473 Te Rapa Road. PO Box , Hamilton 3241 phone fax