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单选题
One end of a diesel engine cylinder is sealed by the cylinder head and the other end by the （）
A
crankcase
B
piston
C
cylinder liner
D
crank cheek
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One cylinder of a diesel engine is persistently knocking and does not cease(停止) when the fuel supply to that cylinder is secured.Which of the following problems may be the cause?A.Low loading of the cylinderB.Excessive cooling of that pistonC.Sluggish ring action on the pistonD.A mechanical defect in a working part
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单选题Which of the listed problems would be indicated by an accumulation of water in one cylinder, in addition to the crankcase of an idle diesel engine?（）A
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单选题Air scavenging of a diesel engine cylinder（）A
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单选题A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）A
feel the high pressure fuel lineB
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单选题Diesel engine cylinder head test cocks are used to（）A
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connect exhaust gas analyzers to determine engine efficiencyC
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单选题Which of the following procedures should be carried out when a large, low-speed, diesel engine is operated with one cylinder secured?（）A
Lubrication to the defective cylinder should be increasedB
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单选题A drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
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listen for combustion knock in that cylinderC
isolate each cylinder and inspect the injectorD
check the cylinder exhaust temperature frequently
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单选题One end of a cylinder for a medium or high-speed diesel engine is sealed by the piston and rings, the other end is sealed by the （）A
crankcaseB
cylinder headC
valve coverD
engine frame
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单选题In the construction of a diesel engine, what is the purpose of end plates?（）A
To provide accessibility to the cylinder linersB
To add stability to the engine blockC
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考题
单选题Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）A
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单选题A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）A
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increase in cylinder turbulenceC
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单选题If water is found in the crankcase of a diesel engine, the cause may be due to（）A
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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
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单选题Persistent knocking in one cylinder of a diesel engine could be caused by（）.A
a low load on that cylinderB
sluggish piston ring actionC
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increase in fuel economyC
reduction in lube oil viscosityD
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单选题A diesel engine is warmed up and white vapor is in the exhaust，this could indicate （）A
excessive cylinder lubricationB
a lugging engineC
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单选题A faulty injection in one cylinder of an operating diesel engine can be located by （）A
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考题
单选题What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）A
Spark plugB
Heat of compressionC
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单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.A
A common rail engine；conventional enginesB
A conventional engine；common rail enginesC
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单选题If a four-stroke/cycle diesel engine is started by injecting air into the cylinder, the pistons receiving the charge of starting air must be（）A
on the power strokeB
on the exhaust strokeC
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考题
单选题One of function of diesel engine lubricating oil is to （）A
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improve fuel penetration in the combustion spaceC
form a friction reducing film between mating surfacesD
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单选题The function of diesel engine piston compression rings is to （）.A
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单选题Compared to a naturally aspirated diesel engine, a supercharged diesel engine has（）A
a cylinder air charge of higher pressureB
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