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单选题
（） allows for expansion and water make up in the water cooling system.
A
A top tank
B
A head tank
C
A head valve
D
A drain tank
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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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单选题If separating effect is not good, which measure should be taken （）A
working at intervals and properly heatingB
warming up to 70℃, increase water supply flowC
improving impulse of water supplyD
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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
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单选题A three-way thermostatic control valve regulates the diesel engine cooling water temperature by passing a portion of the water （）.A
around the engineB
around the coolerC
to the expansion tankD
overboard
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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
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Eroded zinc pencils in the heat exchangerC
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Excessive leakage from jacket water pump seal
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单选题（） allows for expansion and water make up in the water cooling system.A
A top tankB
A head tankC
A head valveD
A drain tank
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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The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A
reduce water temperatureB
reduce water turbulenceC
provide an air cushionD
allow for an increase in water volume as the engine warms up
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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
heat exchanger inlet connectionD
jacket water pump suction line
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单选题A definite advantage of using water as a fire extinguishing agent is its characteristic of（）.A
alternate expansion and contraction as water in a liquid state becomes a vaporB
absorption of smoke and gases as water is converted from a liquid to a vaporC
rapid contraction as water is converted from a liquid to a vaporD
rapid expansion as water absorbs heat and changes to steam
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单选题It is obvious that the expansion of the water （）the increase of its temperature.A
is due toB
dues toC
is becauseD
is for
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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How dose water enter the crankcase of a diesel engine?（）A
Through the crankcase exhausterB
As water vapor contained in blow-byC
Demulsifying lube oil passing through the main bearingsD
Condensation from vapor formed in the expansion tank
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单选题The feed water to the boiler will comprise （）.A
condensateB
a small amount of make-up feedC
A and BD
None of the above
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单选题There is （） in any water cooling system for a diesel engine allowing for expansion and water make-up in the system as well as air vent and chemicals addition.A
a setting tankB
a service tankC
a head tankD
an expansion joint
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