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单选题
Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.
A
cylinder covers
B
lubricating space
C
crosshead
D
exhaust manifold
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单选题During the running of the diesel engine, if the supply of cooling water is interrupted or the temperature of cooling water out of the cylinder is too high, the duty engineer should （）A
notify the duty officer, reduce the engine speed, take some measures to remove failuresB
notify the duty officer and stop the engine immediately, find the cause and remove failuresC
notify the C/ED
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单选题What is head tank in the closed cooling water system used for?（）A
for the release of air from the cooling waterB
providing expansion room for heated cooling waterC
a place for implementing water and water treatment agentD
all of the above
考题
单选题The cooling water jacket is common to all the cylinders but there are often （） to ensure that each cylinder receives the right amount and flow of water.A
dividing wallsB
divided wallsC
dividing linersD
divided jackets
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单选题Fuel is not supplied to the corresponding cylinder due to a failure of （）.A
the motorB
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单选题The fresh water generator produces fresh water （）.A
by cooling sea waterB
by heating sea waterC
by evaporation of sea waterD
by purifying sea water
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
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单选题The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.A
causes colloid suspension in the cooling waterB
reduces the capability of the lubrication systemC
can form pockets which block the flow of coolant through the systemD
leads to the scuffing of cylinder walls
考题
单选题In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the linerA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ and Ⅱ
考题
单选题The cooling liquid used for the cylinder may be referred to as （）.A
jacket waterB
make-up waterC
boiler waterD
flushing water
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单选题Expansion tank should be used to remove （） from cooling water.A
scaleB
sludgeC
chemicalsD
air
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单选题Low compression in a diesel engine could be caused by（）A
worn or broken cylinder liner sealing ringsB
high cooling water temperatureC
worn or broken piston ringsD
low fuel oil pressure
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单选题（） is used for cylinder and cylinder head, the salt water is used for cooling the lubricating oil, the fresh water in the coolers and the charging air in the air cooler.A
The fuel oilB
The lube oilC
The sea waterD
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the scavenge boxC
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单选题Cylinder liners from older lower powered engines had a uniform wall thickness and the cooling was achieved by circulating cooling water through a space formed between （）.A
crown and skirtB
liner and jacketC
ring and grooveD
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单选题Which of the following statements is correct concerning diesel engine cooling water systems?（）A
Each engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operationB
propulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinderC
At least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangersD
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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
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单选题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.A
loss of suction in the circulating pumpB
leak in the primary cooling systemC
broken raw water pump shaftD
burned or cracked piston in one cylinder
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单选题Which of the following statements is correct for the design and installation of diesel engine cooling water systems?（）A
An alarm device with audible and visible signals is required for all cooling water systemsB
Propulsion engines with bores over 200 mm are to be fitted with cooling water jacketsC
Each totally enclosed cooling system shall be provided with a suitable head tankD
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单选题Adequate attention must be given to the water cooling system of the air compressors, for （） can cause condensation on the cylinder walls.A
overcoolingB
poor coolingC
overloadingD
unloading
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单选题In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.A
main bearingsB
sea waterC
cooling oilD
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单选题Which of the listed conditions will affective pressure the most in the cylinder of a diesel engine?（）A
TBN of the lubricating oilB
Temperature of the lube oilC
Completeness in the mixing of the fuel and airD
Temperature of the cooling (sea) water
考题
单选题Piston cooling fins are located（）A
atop the piston crownB
beneath the piston crownC
at the base of the piston skirtD
inside the cylinder liner cooling water jacket
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