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单选题
The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.
A
causes colloid suspension in the cooling water
B
reduces the capability of the lubrication system
C
can form pockets which block the flow of coolant through the system
D
leads to the scuffing of cylinder walls
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更多 “单选题The most serious effect of air trapped in a diesel engine jacket water cooling system is that it（）.A causes colloid suspension in the cooling waterB reduces the capability of the lubrication systemC can form pockets which block the flow of coolant through the systemD leads to the scuffing of cylinder walls” 相关考题
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The most serious effect of air trapped in a diesel engine jacket water cooling system is that it ______．A.Causes colloid suspension in the cooling waterB.Reduces the capability of the lubrication systemC.Can form pockets which block the flow of coolant through the systemD.Leads to the scuffing of cylinder walls
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单选题Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?（）A
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exhaust gas temperatureC
speedD
load
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over-speeding of the engineB
failure of the engine to shut downC
no effect of engine mounting boltsD
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单选题Which of the conditions listed may occur in an operating diesel engine if air pockets form within the cylinder head circulating water passages? （）A
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单选题The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）A
quantity of air it takes in and retains in the cylinders during a given time periodB
proportion of trapped air that is utilized in the combustion processC
thermodynamic efficiency of the engine cycleD
all of the above
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an air manifoldC
a hydraulic distributorD
individual cams and valve gear
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scavenge air pressureC
over-speed tripD
banjo oiler line
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单选题Diesel engine air start system check valves are opened by （）A
an air start camB
cylinder compression pressureC
starting air pressureD
valve springs
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单选题Defective air cooler in a diesel engine will lead to （）.A
smoky exhaustB
starting failureC
overloadD
over speed
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单选题Cooling the intake air supplied to a diesel engine will （）.A
reduce mean effective pressureB
decrease average compression pressureC
decrease air charge densityD
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单选题What is the effect of heated intake air on a diesel engine? （）A
Increases efficiencyB
Increases engine horsepowerC
Increases engine lifeD
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单选题The diesel engine is a type of internal combustion engine which ignites the fuel by injecting it into hot, high pressure air in a （）.A
air bottleB
air compressorC
crank caseD
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单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）A
immediately open all crankcase relief portsB
increase crankcase exhauster speed to draw cool air into the engineC
allow the engine to cool naturallyD
increase crank case scavenge air to remove unburned gases
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单选题If cooling water flow through the after-cooler is interrupted,the power output of a turbocharged diesel engine will drop because the （）A
turbocharger will stallB
density of the air charge will decreaseC
scavenge effect will increaseD
exhaust pressure will increase
考题
单选题A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）A
has little or no internal frictionB
has a lower effective compression ratioC
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单选题Which of the following problems should be taken when cleaning the air filter on a diesel engine equipped with a turbocharger?（）A
Reduce engine speed to idle before removing the filterB
Soak the dirty filter in kerosene onlyC
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单选题（） the engines, the diesel engine is（） used engine on board.A
Between；more commonlyB
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Between；not more commonlyD
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考题
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an obstruction in an cylinderB
water accumulation in some engine cylindersC
low starting air pressureD
low scavenge air pressure
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单选题In a naturally aspirated diesel engine, the volume of air intake is directly related to engine （）.A
compression ratioB
valve sizeC
fuel pressureD
cylinder clearance volume
考题
单选题What is the function of the after-cooler installed in the diesel engine air intakes system?（）A
Decrease the air densityB
Increase the exhaust temperatureC
Decrease the lube oil temperatureD
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单选题“This increase in charge air density is accomplished on most modern diesel engine types by use of exhaust gas turbo-charging, in which a turbine wheel driven by exhaust from the engine is rigidly coupled to a centrifugal type air compressor” According to this sentence, we can know that increases density（）, drives the compressor directly（）A
a modern diesel engine；a turbine wheelB
a modem diesel engine；exhaust gasesC
a compressor；an exhaust gas turbochargerD
a compressor；a turbine wheel
考题
单选题Compared to a naturally aspirated diesel engine, a supercharged diesel engine has（）A
a cylinder air charge of higher pressureB
increased pumping lossesC
less valve overlapD
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