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单选题
The piston cooling system may employ similar components, except that （） is used instead of a head tank.
A
a sump tank
B
a feed well
C
a double bottom tank
D
a drain tank
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excessive condenser cooling waterC
air in the refrigeration systemD
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单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）A
a low level in the engine expansion tankB
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单选题Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.A
low compression pressureB
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单选题The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）A
water coolingB
oil coolingC
air coolingD
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单选题Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.A
cylinder liners and piston ringsB
main bearingsC
crankpin bearingsD
turboblower
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单选题There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.A
recirculatingB
total lossC
coolingD
refrigeration
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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（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.A
Diesel oilB
Hydraulic oilC
Lube oilD
Mineral oil
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单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.A
decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
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单选题Which of the following accurately describes the meaning of redundant cooling？（）A
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The cooling system in a redundant power supplyC
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考题
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
The lower the piston cooling temperature is, the better it isC
Both water and lube oil can be used as coolantD
One of the piston cooling methods is vibration cooling, with better effect
考题
单选题A separate piston cooling system is used to limit any contamination （） piston cooling glands（） the piston cooling system only.A
between；toB
either；orC
from；toD
neither；nor
考题
单选题As an alternative to the conventional seawater cooling system, is based on principles about cooler locations, （）flow control and preheating, but with a central cooler and one additional set of pumps（）.A
the central cooling system, differentB
the central cooling system, the sameC
the open cooling system, differentD
the open cooling system, the same
考题
单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）A
low loading of that cylinderB
faulty combustion in that cylinderC
sluggish piston ring actionD
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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Lube oil in the fresh water cooling system of a diesel engine may result from a （）A
camshaft seizureB
lube oil pump failureC
lube oil cooler failureD
lube oil pump overflow
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单选题The piston cooling system may employ similar components, except that a drain tank is used instead of a head tank That means this system （）.A
doesnt use a drain tank but a head tankB
uses a drain tank not head tankC
uses a drain tank and a head tankD
uses neither a drain tank nor a head tank
考题
单选题Diesel engine piston seizure can be caused by （）A
poor cooling of cylinder wallsB
improper cooling of the pistonC
insufficient piston lubricationD
all of the above
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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