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单选题
A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）
A
reduce heat radiation to the engine room
B
aid in preventing turbocharger overheating
C
condense and drain moisture from exhaust gases
D
dampen exhaust gas pulsations in the manifold
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The space between cylinder liner and jacket is called _____.A.the cooling waterB.the circulating waterC.the coolerD.the cooling water space
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A water jacket is placed around the exhaust manifolds of propulsion diesel enginesto( ).A.reduce heat radiation to the engine roomB.aid in preventing turbocharger overheatingC.condense and drain moisture from exhaust gasesD.dampen exhaust gas pulsations in the manifold
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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
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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
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单选题Which of the diesel engine cylinder liners listed has internal cooling water passages?（）A
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单选题The three conditions which cause engine shutdown are overspeed，low lube oil pressure，and（）.A
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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
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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
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faulty operation of the thermostat
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单选题Engine room fires have been started by neglected oil leaks dripping on to hot pipes or exhaust manifolds （） insulation has not been replaced after maintenance.A
whichB
whenC
whoseD
what
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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
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单选题The satisfactory operation of diesel engine exhaust valves usually depends on（）A
the proper back pressureB
the cooling water temperatureC
correct timing and proper seatingD
accurate metering and the exhaust temperature
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单选题Keel coolers fouled with marine growth, will result in （）A
higher raw water temperaturesB
higher jacket water temperaturesC
a malfunctioning thermostatD
higher fuel temperature
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单选题The cylinder liner forming the cylinder wall and the inside of the water jacket is called a（）A
dry linerB
wet linerC
jacket linerD
corrugated liner
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单选题Which pump installation would require an external source of sealing water?（）A
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Salt water service pumpC
Auxiliary condensate pumpD
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单选题Higher than normal jacket water temperatures occurring in all cylinders of a diesel engine can result from a/an （）.A
oil suction line restrictionB
correct amount of coolantC
cavitation erosion in the water jacketsD
clogged sea suction strainer
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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
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a jammed three-way thermostatic valveC
chromate PH too lowD
a high level in the surge tank
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单选题Fuel is ignited in a diesel engine cylinder by （）A
a spark plugB
injectorsC
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单选题Operating a diesel engine under light loads and at low temperatures for an exhaust for an extended period can result in（）A
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an increase in lube oil viscosity due to fuel dilution
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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
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单选题In a diesel engine jacket water cooler, with seawater cooling the fresh water, the（）A
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jacket water pressure must always be less than the sea water pressure
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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
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nozzle cooling passagesC
cylinder jacketsD
heat exchanger
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单选题When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and （） the sea water passing through the tubes.A
disposeB
dissolveC
heatD
dissipates
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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
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