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单选题
The rate of wear on a cylinder liner depends on the （）
A
quality of air filtration
B
effectiveness of lubrication
C
type of fuel used
D
all of the above
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The space between cylinder liner and jacket is called _____.A.the cooling waterB.the circulating waterC.the coolerD.the cooling water space
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Diesel engine blow-by is the leakage of combustion gases past the( ).A.oil rings onlyB.compression and scraper ringsC.cylinder liner sealingD.cylinder liner ring grooves
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单选题Low compression in a diesel engine can be caused by （）A
clogged coolant passagesB
a leaking cylinder head gasketC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
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单选题One advantage of dry cylinder liners used in a diesel engine is the（）A
lower thermal expansion rates than wet linersB
greater heat transfer rate than wet linersC
greater wear resistance than wet linersD
procedure to replace dry liners is simpler than for wet liners
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单选题Which of the following operation will have a direct impact on the rate of wear in a cylinder liner （）A
amount of scavenge air to the cylinderB
quality of fuel injectedC
viscosity of the lube oilD
compression ratio of the piston
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单选题“lover-leafing”is a term used to describe corrosive wear at several separate points around liner circumference- iein some cases the liner bore may assume a “clover-leaf”shape（）A
transverseB
longitudinalC
circumferentialD
radial
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单选题In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.A
additivesB
waterC
greaseD
acid solution
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单选题If cylinder liner wear is up to maximum limits the possibility of scavenge fires will not be materially reduced until the liners are （）.A
polishedB
renewedC
adjustedD
ground
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单选题The bore of each cylinder is formed in a liner which can be （） when worn out.A
weldedB
replacedC
drilled againD
bored
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单选题In a diesel engine, excessive cylinder liner wear will cause （） (1) increased blow-by (2) wear between the piston ring and grooveA
(1) only is correctB
(2) only is correctC
both (1) and (2) are correctD
neither (1) or (2) axe correct
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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
increased cylinder lube oil consumptionD
poor contact between compression rings and liner
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单选题Visual inspection of chrome-plated piston compression rings reveals a black ring face at the position of the cylinder liner portsThis condition indicates a ring which（）A
has a crown-faceB
exceeds wear limits through normal wearC
has excessive blow-byD
is in good condition
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单选题The cylinder liner forming the cylinder wall and the inside of the water jacket is called a（）A
dry linerB
wet linerC
jacket linerD
corrugated liner
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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
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ and Ⅱ
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单选题In order to increase the wearing resistance, the cylinder liner surfaces are sometimes （）.A
aluminum-platedB
bronze-platedC
zinc-platedD
chromium-plated
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单选题Cylinder liner cooling is often referred to as （）.A
piston coolingB
sleeve coolingC
central coolingD
jacket cooling
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单选题The cylinder head, cylinder liner and （） form the combustion chamber.A
frameB
pistonC
crankcaseD
explosion plate
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单选题The rate of fuel injection in a diesel engine cylinder depends primarily on （）.A
the size of the holes in the fuel nozzleB
timing of the pumpC
supply pressure to the pumpD
shape of the combustion chamber
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单选题A single piece（） fitted with bronze rings guides the piston in the cylinder liner.A
piston skirtB
piston crownC
guide wayD
cross-head
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单选题On the top of the cylinder is mounted the cylinder cover which is pressed onto （） of the cylinder liner by means of nuts and studs.A
the camshaftB
the flangeC
the ridgeD
the bulge
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单选题Which of the following statements concerning cylinder liner wear is true?（）A
Liner wear is distributed equally between the upper and lower portions of the cylinderB
Excessive liner wear causes wear between piston ring and grooveC
Excessive, but uniform liner wear will not cause wear between piston ring and grooveD
Liner wear is normally greatest in the middle of the cylinder
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单选题There is a support ring between the cylinder block and collar of the cylinder liner, thus carrying both the liner and the cylinder coverIt also passes to the cooling bores and to the cover（）A
cooling waterB
cooling oilC
refrigerantD
lubricate oil
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单选题The cylinder is fitted with internal liner so that a water space is left （） the liner and the outer wall.A
aroundB
amongC
inD
between
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单选题Piston compression rings used in a diesel engine function to （）A
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In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveA
Ⅰonly is correctB
Ⅱ only is correctC
both Ⅰ and Ⅱ are correctD
neither Ⅰ or Ⅱ are correct
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单选题A properly honed diesel engine cylinder liner will（）A
prevent piston ring wearB
shorten the ring break-in periodC
prevent cylinder liner glazingD
appear slick and glazed
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