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单选题
Sea water is not directly used as a coolant for engines because of its （）.
A
low specific heat
B
corrosive action
C
high expense
D
acid property
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单选题Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?（）A
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Leaks in the cooler tube nestC
Operating the engine while maintaining a high sea water outlet temperatureD
A punctured sea water strainer supplying cooling water to the heat exchanger
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单选题Sea water is not used directly as a coolant because of （）.A
low specific heatB
high specific heatC
corrosive actionD
high viscosity
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单选题The fresh water generator produces fresh water （）.A
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单选题（）is used to prevent the entry of sea water to the machinery space.A
A special sealing glandB
PropellerC
TailshaftD
Sterntube bearing
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单选题Thermocouple pyrometers are used on large, main propulsion diesel engines to indicate the temperature of the（）A
cooling water leaving each cylinderB
fuel oil entering the injectorC
exhaust gases at various locationsD
lube oil at the bearing supplies
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单选题Each cylinder liner on the marine medium speed engines （）.A
is usually cooled by sea waterB
can be replaced when worn outC
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can t expand when heated
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单选题What should you apply to a fathometer reading to determine the depth of water?（）A
Subtract the draft of the vesselB
Add the draft of the vesselC
Subtract the sea water correctionD
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单选题A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.A
cylinder headsB
exhaust valvesC
scavenging airD
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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
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Suitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling
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jacket water pressure must always be less than the sea water pressure
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单选题According to the SOLAS convention, the bilge water system （）A
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should not pump out the water accumulated in the cargosC
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考题
单选题An electric heater built into some smaller diesel engines is used to （）.A
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increase air inlet temperatureC
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单选题When water is used to fight a fire on board a ship，the effect of the weight of the water must be taken into account. How much sea water will increase the weight displacement by one ton?（）A
64 cubic feetB
35 cubic feetC
100 gallonsD
500 liters
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main bearingsB
sea waterC
cooling oilD
lower temperature fresh water
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