1) Which method of heat transfer is prevented by heat shields fitted to the exhaust on some vehicles? a) Convection. b) Conduction. c) Radiation. d) Induction. 2) Cross-flow radiators are fitted to many modern vehicles because they: a) are cheaper to manufacture. b) are more efficient than vertical-flow types. c) allow a low hood line to be achieved. d) are more efficient on transverse engine vehicles. 3) Natural circulation of coolant in a cooling system is called: a) induction thermo-flow. b) convention - circulation. c) thermo-flow. d) thermo-siphon. 4) Adequate air circulation over the fins of an air-cooled stationary engine is provided by: a) convection currents as the fins heat up. b) natural air movement. c) heat radiating to the lubricating oil. d) an engine-driven fan. 5) Circulation of coolant in a modern cooling system is assisted by: a) the action of the cooling fan. b) an engine-driven centrifugal pump. c) a viscous coupling. d) an electrically-driven coolant pump and fan. 6) The thermostat in an engine cooling system: a) prevents coolant loss. b) switches on the electric cooling fan. c) prevents the coolant freezing. d) assists the engine to warm up quickly. 7) The thermostat in an engine cooling system controls: a) pressurization of the system. b) circulation of coolant to the radiator. c) operation of the electric fan. d) circulation of coolant to the heater. 8) Thermo-siphon circulation of coolant in an automotive cooling system is termed: a) absorption. b) radiation. c) conduction. d) convection. 9) Cooling fins on the cylinders of an air cooled engine: a) provide increased surface area. b) reduce engine noise. c) improve engine strength. d) reduce the severity of burns. 10) The purpose of the viscous clutch on the fan hub is to: a) reduce engine power loss and noise. b) improve cooling at high road speeds. c) extend engine warm-up time. d) reduce under-hood temperatures. 11) The 2 valves incorporated in the radiator cap are: a) the pressure and regulator valves. b) the regulator and vacuum valves. c) the vacuum and pressure valves. d) the temperature and pressure valves. 12) Cooling systems are pressurized to: a) improve coolant circulation. b) prevent internal coolant leaks. c) increase the warm-up period. d) raise the boiling point of the coolant. 13) The vacuum valve in the radiator cap: a) maintains a vacuum in the system at all times. b) prevents a vacuum occurring as the engine cools. c) prevents air entering the system. d) allows thermo-siphon circulation of the coolant. 14) Which additives keep contaminants in suspension within the oil? a) Dispersants. b) Detergents. c) Anti oxidants. d) Anti-foam agents. 15) Special chemicals are added to the water in an engine cooling system to: a) prevent corrosion and freezing. b) lower its boiling point. c) prevent foaming and evaporation. d) prevent cavitation and lubricate the pump seal. 16) The viscosity of an oil refers to: a) sulphur content. b) flash point. c) resistance to flow. d) ease with which it oxidizes. 17) Automotive engines rely on a high or low co-efficient of friction for effective performance? a) High. b) Low. c) Both high & low. 18) Contamination of oil in an engine is usually caused by: a) natural deterioration of the oil. b) the use of crankshaft labyrinth seals. c) dust which enters the dipstick tube. d) by-products of combustion. 19) What does the S.A.E. rating of the oil indicate? a) The interval between oil changes. b) The detergent content of the oil. c) The ability of the oil to resist heat. d) The viscosity of the oil. 20) A cooling system thermostat that is seized in the “open” position will cause: a) the viscous coupling on the clutch to lock up. b) the engine to overheat. c) excessive fuel consumption and exhaust emissions. d) excessive water pump speeds. 21) Which additives in engine oil reduce build-up of deposits on pistons and valves? a) Detergents. b) Dispersants c) Inhibitors. d) Depressants. 22) Which of the following additives gives an engine oil its multi-grade property? a) Anti-wear agents. b) Detergents. c) Pour-point depressants. d) Viscosity index improvers. 23) The purpose of the by-pass valve in an oil filter is to: a) allow oil to by-pass the filter when necessary. b) send some oil to the by-pass filter. c) prevent high oil pressure developing. d) direct by-passed oil to the sump. 24) What does the A.P.I. classification of the oil refer to? a) The type of service that suits that oil. b) The viscosity index rating of the oil. c) The detergent content of the oil. d) The same as the S.A.E. rating. 25) The bearings in a 2-stroke petrol engine are normally lubricated by: a) oil under pressure from the sump. b) oil carried in with the fuel and air. c) oil injected above the piston. d) oil from a scavenge pump. 26) Conduction is the transfer of heat: a) through a liquid or gas. b) by invisible rays. c) through a solid. d) from the fins of an air cooled engine to the atmosphere. 27) The rotor apex seals in a rotary engine are lubricated by: a) oil under pressure from a main bearing. b) oil splash from an oil slinger. c) oil mist in the crankcase. d) oil injected into the intake manifold. 28) Reducing the warm-up cycle for an engine by closing the thermostat will help prevent: a) excess engine wear. b) chemical breakdown in the coolant. c) the engine stalling on take-off. d) aeration of the coolant. 29) What is the main function of a separate recovery tank? a) To stabilize the coolant temperature. b) To increase the system's operating pressure. c) A more convenient location for adding coolant to the system. d) To maintain coolant in the system at all times. 30) One of the functions of a radiator cap is to: a) protect the chemical additives of some coolants from breaking down. b) increase the boiling point of the coolant in proportion to the spring tension. c) to prevent the engine coolant from boiling. d) to control the temperature of the heater core. 31) Which component in the lubrication system regulates the oil pressure? a) The oil pump. b) The pressure relief valve. c) The filter by-pass valve. d) The by-pass filter. 32) With a crossflow radiator, the coolant flow is from: a) side to side. b) top to bottom. c) end to top. d) bottom to end. 33) The primary function for the engine water pump is: a) to circulate the coolant through the engine. b) to pressurize the cooling system. c) to circulate the coolant when the thermostat is closed. d) to pump the heated coolant into the heater core. 34) A radiator coolant inhibitor needs to prevent 3 conditions. These conditions are: a) Over Heating, Corrosion & Staining. b) Freezing, Corrosion & Staining. c) Freezing, Over Heating & Corrosion. d) None of the above. 35) When overhauling an air cooled engine, it is necessary to ensure that all fins are clean and intact to: a) stop dilution of the engine. b) assist the engine in warming up. c) maintain correct heat transfer. d) prevent oil leaks. 36) An engine operating at well below the designed operating temperature will: a) produce the same power as an engine operating at the correct temperature. b) increase cylinder, piston and piston ring wear. c) have no detrimental effect on engine life. d) enable a longer, useful life for engine lubricating oil. 37) Removing the radiator cap of a hot engine may cause: a) the bottom hose to collapse. b) immediate boiling of the coolant. c) the engine to seize due to a sudden rise in temperature. d) damage to the radiator core. 38) A by-pass is incorporated in a cooling system to: a) raise the boiling point of the water. b) prevent the radiator hoses from collapsing on engine cooling. c) allow the coolant to circulate through the engine when the thermostat is closed. d) allow the coolant to by-pass to the radiator when the pressure becomes excessive. 39) With a downflow radiator, the coolant flow is from: a) top to bottom. b) side to side. c) end to end. d) bottom to top. 40) Which is the most common oil filtering system employed on automotive vehicles? a) Full flow. b) By-Pass. c) Half-pass. d) Treble-pass.

Engine Cooling and Lubrication Big Quiz (Recap)

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