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单选题
It is necessary to remove （） from the cooling water spaces to improve heat transfer.
A
lime
B
frost
C
scale
D
scar
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单选题When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.A
strengthB
denseC
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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
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单选题A separate piston cooling system is used （） any contamination from piston cooling glands to the piston cooling system only.A
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单选题Vents are led from the engine to the head tank for the release of （） from the cooling water.A
airB
heatC
sludgeD
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单选题Expansion tank should be used to remove （） from cooling water.A
scaleB
sludgeC
chemicalsD
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单选题The outlet from an expansion tank of a closed freshwater cooling system should be piped to the （）.A
cylinder head water outlet headerB
cylinder jacket inlet mainC
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单选题Water is a very effective fire extinguishing agent because it（）A
will remove all the toxic fumes from the airB
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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
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liner and jacketC
ring and grooveD
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raw water pump dischargeB
expansion tank outletC
cooling water heat exchangerD
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单选题Vents are led from the engine to head tank （） from the cooling water.A
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单选题Some diesel engines are fitted with a thermometer in the cooling water outlet from each cylinderIf the cooling water temperature from all cylinders begins to rise above normal, you should suspect （）A
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单选题The air spaces in the floor of an inflatable liferaft will provide protection against（）.A
asphyxiation from CO2B
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rough seasD
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单选题If the compressor-discharge temperature is higher than the receiver temperature（）A
increase the amount of cooling water to the condenserB
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单选题When oil is accidentally discharged into the water，what should you do after reporting the discharge（）.A
Contain the oil and remove as much of it as possible from the waterB
Throw chemical agents on the water to disperse the oilC
Throw sand on the water to sink the oilD
Obtain your permit from the Corps of Engineers
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