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单选题
The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）
A
regulating the level of corrosion inhibitor in the primary cooling system
B
the level of the freshwater expansion tank
C
varying the engine load to meet temperature requirements
D
the operation of the thermostatic valve
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更多 “单选题The jacket water temperature in a diesel engine closed freshwater cooling system is normally controlled by （）A regulating the level of corrosion inhibitor in the primary cooling systemB the level of the freshwater expansion tankC varying the engine load to meet temperature requirementsD the operation of the thermostatic valve” 相关考题
考题
If an auxiliary diesel engine coolant temperature is higher than normal, but the thermostat is determined not to be defective, you would suspect a/anA.cavitation erosion in the water jacketsB.excess corrosion inhibitor in the coolantC.dirty jacket water coolerD.defective turbocharger
考题
The main propulsion diesel engine jacket water temperature rises above normal, with the raw sea suction and the expansion tank water level being normal. Which of the following problems is most likely the cause?A.Faulty thermostatic bypass valveB.Eroded zinc pencils in the heat exchangerC.Steam formation in the expansion tankD.Excessive leakage from jacket water pump seals
考题
单选题If a diesel engine were running at 20% overload with a smoky exhaust, you should（）A
stop the engine immediately to prevent damageB
increase lube oil pressureC
slow the engine allowing it to gradually coolD
decrease the cooling water it temperature to the water jacket
考题
单选题If the coolant temperature of a closed cooling water system for a diesel engine gradually increases, the trouble usually is （）A
a broken shaft on the freshwater pumpB
an excessive accumulation of scale exchangerC
an incorrect thermostatic element operating rangeD
lube oil in the cooling water
考题
单选题Stating a large propulsion diesel engine using diesel fuel during cold weather conditions can be made easier by （）A
increasing the quantity of starting airB
increasing the lube oil pressureC
heating the engine fuel supplyD
heating the engine jacket water
考题
单选题The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.A
fresh water expansion tankB
sea water expansion tankC
thermostatic expansion valveD
jacket water cooler accumulator
考题
单选题One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）A
reduce lube oil temperatureB
raise exhaust temperature reduceC
excessive heating of engine roomD
reduce load on cooling water pump
考题
单选题If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）A
a dirty lube oil strainerB
internal water leaksC
an oil suction line restrictionD
excessive wears of the cooling water pump
考题
单选题Which of the diesel engine cylinder liners listed has internal cooling water passages?（）A
Internally finned linerB
Externally finned linerC
Wet linerD
Integral water-jacket liner
考题
单选题If the jacket water temperature of an operating diesel engine suddenly rises above normal, the cause can be attributed to （）.A
an overfilled expansion tankB
excess chromate treatment of the jacket waterC
a clogged raw water sea suctionD
cavitation erosion of the heat exchanger tubes
考题
单选题If the jacket water temperature in an auxiliary diesel engine cooling system is lower than normal, the probable cause is （）A
air binding of the engine cooling systemB
a cracked water cooled exhaust manifoldC
blockage in the heat exchangerD
faulty operation of the thermostat
考题
单选题The main propulsion diesel engine jacket water temperature rises above normal, with the raw water sea suction and the expansion tank water level being normalWhich of the following problems is most likely the cause?（）A
Faulty thermostatic bypass valveB
Eroded zinc pencils in the heat exchangerC
Steam formation in the expansion tankD
Excessive leakage from jacket water pump seal
考题
单选题Immediately after starting a diesel engine, normal raw water and jacket water pressure are indicatedHowever, the jacket water temperature continues to rise, if there is no change in the sea temperature, you should suspect（）A
overloading in all cylindersB
a jammed three-way thermostatic valveC
chromate PH too lowD
a high level in the surge tank
考题
单选题In a closed cooling system for a turbocharged, four-stroke/cycle diesel engine, fluctuating water pressure can be caused by （）A
improper venting of the cooling systemB
carrying the expansion tank water level too highC
a totally clogged impeller in the cooling water pumpD
an incorrectly set cooling system temperature control
考题
单选题The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A
reduce water temperatureB
reduce water turbulenceC
provide an air cushionD
allow for an increase in water volume as the engine warms up
考题
单选题Fuel is ignited in a diesel engine cylinder by （）A
a spark plugB
injectorsC
the heat of compressionD
increasing jacket water temperatures
考题
单选题The highest pressure in any closed diesel engine freshwater cooling system is at the （）.A
jacket water outletB
expansion tank inletC
heat exchanger inletD
cooling water pump outlet
考题
单选题In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）A
raw water pump dischargeB
expansion tank outletC
cooling water heat exchangerD
outlet engine jacket water outlet
考题
单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）A
sea water temperature must never be warmer than 40℃B
jacket water pressure should always be greater than the sea water pressureC
jacket water temperature must always be less than 60℃D
jacket water pressure must always be less than the sea water pressure
考题
单选题If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）A
cavitation erosion in the water jacketsB
excess corrosion inhibitor in the coolantC
dirty jacket water coolerD
defective turbocharger
考题
单选题Which of the following problems can cause fluctuating pressures in the closed cooling system of a main propulsion diesel engine?（）A
Defective temperature controls in the systemB
Cavitation in the cooling water pumpC
Opened vent in the cooling systemD
Restricted water passages in the engine
考题
单选题If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST （）A
place standby cooler in operationB
reduce engine loadC
check thermostatic valveD
clean sea water strainer
考题
单选题Temperature control valves installed in the jacket cooling water system of a diesel engine modulates the rate of water flow through the （）.A
cooling water pumpB
nozzle cooling passagesC
cylinder jacketsD
heat exchanger
考题
单选题Operating a diesel engine for prolonged periods, with a closed freshwater cooling system, at temperatures lower than the normal design temperature can cause （）.A
the formation of sulfuric acidB
a decrease in lube oil viscosityC
a decrease in cooling water pHD
a thermostat failure
考题
单选题Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.A
cylinder coversB
lubricating spaceC
crossheadD
exhaust manifold
考题
单选题Which of the following conditions will develop if the flow of ‘raw’ cooling water to diesel engine is obstructed?（）A
Air will enter the cooling systemB
Carbon will plug the water cooled exhaust manifoldsC
The jacket water temperature will riseD
The lube oil viscosity will increase
考题
单选题When using a fuel with a higher than normal sulfur content in an auxiliary diesel engine, you should（）A
maintain higher than normal jacket water temperatureB
change the lube oil more frequently than normalC
maintain a higher air-box temperature than normalD
maintain a higher air-box pressure than normal
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