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单选题
Those generally used additives for cooling water are either anti-corrosion oils or inorganic（）.
A
gases
B
paints
C
inhibitors
D
detergent
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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
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Baffle plates that have been bent during prior removalB
Leaks in the cooler tube nestC
Operating the engine while maintaining a high sea water outlet temperatureD
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单选题In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）A
An open vent in the cooling systemB
A fouled sea chestC
A restricted water passage in the engineD
Air entrained in the cooling water
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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
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单选题Where is the cooling water from the compensating tank in the cooling water system of main engine lead to?（）A
discharge side of the centrifugal pumpB
suction side of the centrifugal pumpC
the lowest point of the cooling water systemD
inlet of the main engine
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High diesel engine cooling water temperatures can be caused by （）.A
air in the cooling systemB
an overhauled water pumpC
correct amount of coolantD
no air in the cooling system
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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
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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
fresh waterB
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单选题Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to （）A
maintain low pH in the cooling waterB
reduce the cooling water temperatureC
increase cooling water hardnessD
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单选题When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water （）.A
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单选题As to the piston cooling, of the following, which statement is not true?（）A
Because the piston is exposed to very high temperature, it must be cooledB
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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
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The lube oilC
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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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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
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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
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考题
单选题The emergency bilge suction valve is typically used （）.A
to inject cleaning additives when the bilges are extremely dirtyB
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to connect the rose box to the independent bilge suctionD
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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 coversB
lubricating spaceC
crossheadD
exhaust manifold
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main bearingsB
sea waterC
cooling oilD
lower temperature fresh water
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