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单选题
Scuffed cylinder liner surfaces in a diesel engine can result form（）
A
starting the engine hot
B
knurling the piston skirt
C
operating an overheated engine
D
using scuff resistant piston rings
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knurling the piston skirtC
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horsepower outputC
fuel consumptionD
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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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chromium plating piston ringsB
knurling the piston skirtC
extended maximum power operationD
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decreased fuel consumption per brake horsepowerB
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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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both Ⅰ and ⅡD
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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Low compression pressure in a diesel engine is caused by（）A
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单选题Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）A
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fire improperlyC
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leaking cylinder liner seal ringsC
late fuel injection timingD
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checking cam positionD
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transfer heat from the cylinder to the pistonB
scrape oil from the sides of the pistonC
seal the combustion space from the crankcasesD
prevent any piston contact with the cylinder liner
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单选题A diesel engine piston crown can crack from （）A
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faulty nozzle sprayD
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单选题Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except（）A
open the indicator cocksB
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prevent cylinder liner glazingD
appear slick and glazed
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