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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 cylinder
B
sluggish piston ring action
C
excessive piston crown cooling
D
excessive clearance of piston pin
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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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excessive water in the fuelC
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liquid in the cylinderB
low compression in the cylinderC
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crankcaseB
pistonC
cylinder linerD
crank cheek
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Leaking seal ringB
Insufficient heat transfer from the exhaust valvesC
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Excessive scavenging air provided to the engine
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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
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单选题Diesel engine cylinder head test cocks are used to（）A
check cylinder lubrication prior to starting engineB
connect exhaust gas analyzers to determine engine efficiencyC
pressure test cylinder heads to check for leaksD
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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
Cooling water temperature to the engine should be increasedC
Only the turbocharger speed should be reducedD
Engine speed should be reduced
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单选题Which of the conditions listed could cause the cylinder relief valves on a large, low-speed, propulsion diesel engine to lift?（）A
Plugged injector nozzlesB
Excessive fuel injectionC
Very late injection timingD
Incorrect crankshaft clearance
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单选题A drop in compression pressure in one cylinder of a diesel engine can be caused by（）A
a leaking fuel injection nozzleB
a clogged air filterC
early fuel injectionD
burned valves
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单选题The most practical way of detecting an overload in one cylinder of an operating large, low-speed ,main propulsion diesel engine is to （）A
check the cylinder exhausts for black smokeB
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Low compression in a diesel engine could be caused by（）A
worn or broken cylinder liner sealing ringsB
high cooling water temperatureC
worn or broken piston ringsD
low fuel oil pressure
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low exhaust back pressureB
early fuel injection in one of the cylindersC
compression pressure in one of the cylindersD
plugged injector holes
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Over speedB
fire improperlyC
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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
low loading of that cylinderB
faulty combustion in that cylinderC
sluggish piston ring actionD
excessive piston cooling
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单选题One result of operating a diesel engine at light load with excessively low cooling water temperature is a/an （）A
decrease in ignition lagB
increase in fuel economyC
reduction in lube oil viscosityD
increase in cylinder misfiring
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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
a leaking cylinder linerD
overloading of one cylinder
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单选题A faulty injection in one cylinder of an operating diesel engine can be located by （）A
cutting out individual injectors and noting engine performanceB
checking lube oil temperatureC
checking cam positionD
using a timing light
考题
单选题One remedy for a high firing pressure, in addition to a high exhaust temperature in one cylinder of a diesel engine, is to （）A
increase scavenge air pressureB
reduce fuel booster pump pressureC
adjust the fuel rackD
retard fuel injector timing
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
CarburetorD
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考题
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
A marine diesel engine；most other enginesD
A two-stroke engine；four-stroke engines
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单选题One of function of diesel engine lubricating oil is to （）A
induce carbon formation on cylinder wallsB
improve fuel penetration in the combustion spaceC
form a friction reducing film between mating surfacesD
lubricate the fuel injection
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