ENGINE COOLING EXAM LATEST UPDATE ALREADY GRADED A UPDATE

ENGINE COOLING EXAM LATEST UPDATE ALREADY GRADED A UPDATE About how much of the heat produced within modern engine combustion chambers must be removed by the vehicle cooling system? (A) One-fourth. (B) One-third. (C) One-half. (D) Two-thirds. - ANSWERB True or False? One job of the engine cooling system is to maintain an efficient temperature during all operating conditions. - ANSWERTrue All of the following conditions can occur to an engine operating below its efficient operating temperature (cold), except: (A) decreased horsepower. (B) formation of engine deposits. (C) lower exhaust emissions. (D) decreased fuel mileage. - ANSWERC True or False? Most car and light truck engines use an air cooling system. - ANSWERFalse _____ are cast into the engine block and cylinder heads for liquid to flow through a liquid-cooled engine. (A) Cooling fins (B) Expansion tanks (C) Cooling passages (D) Freeze plugs - ANSWERC True or False? A liquid-cooled engine uses pure water to cool the engine. - ANSWERFalse To control engine temperature more accurately, the coolant pump on some new vehicles is driven by a(n) _____. (A) internal gear (B) electric motor (C) beltdriven clutch (D) chain drive - ANSWERB A(n) _____ removes heat from coolant so it can be reused. (A) impeller (B) freeze plug (C) radiator (D) thermostat - ANSWERC True or False? A fan clutch causes a fan to freewheel above a certain engine rpm. - ANSWERTrue All of the following statements about rubber hoses used in a vehicle cooling system are true, except: (A) they are secured to their fittings by hose clamps. (B) they offer a universal fit on any cooling system design and engine size. (C) they connect the radiator to the coolant pump and engine. (D) they must be strong but flexible to withstand system conditions. - ANSWERB The thermostat should be completely closed when the engine is _____. (A) cold (B) partially warm (C) fully warmed up (D) overheating - ANSWERA True or False? The thermostat constantly changes the size of its opening in relation to coolant temperature. - ANSWERTrue Modern thermostats are operated by a_____. (A) wax pellet (B) coolant shut-off valve (C) bleeder valve (D) cover finger - ANSWERA True or False? Thermostats featuring a higher temperature range raise the engine operating temperature quickly, and in doing so, aid in emission control. - ANSWERTrue To prevent NO X formation in a partially warmed-up engine, a(n) _____ is sometimes used. (A) freeze plug (B) manual bleeder valve (C) pressure cap (D) electronic thermostat - ANSWERD