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单选题
Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）
A
chromium plating piston rings
B
knurling the piston skirt
C
extended maximum power operation
D
applying load to a cold diesel engine
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单选题Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.A
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单选题Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）A
starting the engine while hotB
knurling the piston skirtC
operating the engine overheatedD
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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
increased piston wearC
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单选题The diameter of a piston is usually less at the crown than at the skirt, in order to （）.A
facilitate the installation of piston ringsB
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单选题Each cylinder liner on the marine medium speed engines （）.A
is usually cooled by sea waterB
can be replaced when worn outC
is in direct contact with the water in the bore of the cylinderD
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单选题In a diesel engine, an integral liner is one in which the cooling water （） Ⅰ.flows through the cylinder liner jackets Ⅱ.touches the outer side of the linerA
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单选题In a diesel engine, a cylinder liner should be replaced if it is （） Ⅰ.Scuffed Ⅱ.ScoredA
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Ⅱ only is correctC
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单选题In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.A
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bronze-platedC
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单选题If over a period of time, the oi1 film partially disappears, so that dry areas are formed on the cylinder wall, these areas and the piston surfaces will by frictional interaction, become finely scuffed and hardened, iegood mirror surface" will have deterioratedWhat condition of the piston rings can result in this phenomenon?（）A
micro-seizureB
stickingC
scratchedD
breakage/collapse
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单选题Scuffed cylinder liner surfaces in a diesel engine can result form（）A
starting the engine hotB
knurling the piston skirtC
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using scuff resistant piston rings
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scrape oil from the sides of the pistonC
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prevent any piston contact with the cylinder liner
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单选题In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveA
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Ⅱ only is correctC
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the compression strokeC
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