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单选题
If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）
A
micro-seizure
B
sticking
C
scratched
D
breakage/ollapse
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更多 “单选题If due to thick and hard deposits of carbon, the piston rings cannot move freely in their grooves, dark areas will often appear on the upper part of the cylinder wall (may not be the risible at port inspection)What condition of the piston rings can result in this phenomenon?（）A micro-seizureB stickingC scratchedD breakage/ollapse” 相关考题
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Which of the following statements represents the function of the compression rings installed at the top of a diesel Engine piston?A.Control the amount of lube oil burned in the combustion chamberB.Transmit heat from the piston to the cylinder linerC.Prevent damage to ring groove inserts by acting as a heat damD.Dissipate combustion chamber gas pressure by channeling it through the ring gap
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In a diesel engine, when refitting piston rings you should ①check the ring gap at the smallest diameter of the cylinder ②remove carbon from the ring grooveA.①B.②C.①②D.neither ① nor ②
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In a diesel engine, when refitting piston rings you should______. I. check the ring gap at the smallest diameter of the cylinder II. remove carbon from the ring grooveA.I onlyB.II onlyC.both I and IID.neither I nor II
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单选题The lowest ring of a piston is （）.A
a coil springB
a sealing ringC
an oil distributor ringD
main seal ring
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单选题In some diesel engine designs,（）the injection of cylinder oil is timed to impinge when the piston and only impinge on（）A
is coming upward；cylinder ring beltB
is going downward；piston ring beltC
is coming upward；piston ring beltD
is going downward；cylinder ring belt
考题
单选题The carbon deposits on the piston crown and in the ring grooves （）.A
should be scrapedB
should be derustedC
should be drilled outD
to be brushed off
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单选题A diesel engine piston ring face is in direct contact with the （）.A
top of the ring grooveB
cylinder liner oil filmC
bottom of the ring grooveD
back of the ring groove
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单选题In a diesel engine, when refitting piston rings you should （） Ⅰ.check the ring gap at the smallest diameter of the cylinder Ⅱ. Remove carbon from the ring grooveA
Ⅰ onlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ nor Ⅱ
考题
单选题A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（） Ⅰ.gap Ⅱ.sideA
ⅠonlyB
Ⅱ onlyC
both Ⅰ and ⅡD
neither Ⅰ nor Ⅱ
考题
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
考题
单选题Incomplete combustion in a running diesel engine can cause piston rings to become stuck as a result of （）A
residual carbon depositsB
lube oil viscosity breakdownC
uneven heat expansion of the ringsD
uneven heat expansion of the piston
考题
单选题Which of the following characteristic of lube oil helps to reduce the amount of deposits in the piston ring belt during the combustion process in a diesel engine?（）A
Low viscosity indexB
Low carbon forming tendenciesC
High film strengthD
High non-corrosive qualities
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单选题Diesel engine piston ring blow-by is usually caused by excessive ring clearance at the ring（）A
backB
sideC
gapD
bottom
考题
单选题The clearance volume for a single stage compressor is defined as the space created between the （）.A
top of the piston and bottom side of head, with the piston at BDCB
piston and head, including the space around the piston to the top of the upper ring and under the valves, with the piston at TDCC
bottom of the piston and bottom side of the head at TDC, regardless of upper ring location and valve placementD
top of the piston and bottom side of the head at TDC as compared to that which exists between the top of the piston and bottom side of head at BDC
考题
单选题In an internal combustion engine, which of the devices listed will force the compression rings to seal the compression gases in the space above the piston?（）A
Used of bimetallic piston ringsB
Ring gap pre-tensioningC
Thermal increase in ring-end clearanceD
Gas pressure acting against the back of the ring
考题
单选题In the sentence “In some designs the cylinder oil is timed so that the oil injects only on the piston ring belt, the "piston ring belt" means （）.A
piston crownB
piston ring grooveC
piston skirtD
piston ring area
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单选题A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）A
gapB
sideC
backD
radial
考题
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
excessive piston crown coolingD
excessive clearance of piston pin
考题
单选题For any piston ring to operate smoothly without scuffing ,the ring must be （）.A
of a material harder than the cylinder linerB
properly lubricatedC
prevented from compressingD
prevented from rotating during engine operation
考题
单选题Why is the ring belt narrower in diameter than the skirt of a piston designed for a diesel engine?（）A
To allow for greater expansion due to higher operating temperatureB
To seal the cylinder against leakage of combustion gasesC
To provide an additional surface for oil coolingD
To provide an additional strength for the crown and lower structure
考题
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
考题
单选题If the piston ring gap remains insufficient when installing new rings, youshould（）A
install oversized ringsB
hone the cylinder liner to allow ring installationC
compress the rings tighter with a compressing toolD
file the ends of the rings
考题
单选题If the compression rings on a diesel engine piston become stuck in the ring groove, the cause may be due to（）A
excessive ring actionB
excessive ring temperatureC
improper ring rotationD
excessive ring face wear
考题
单选题The sealing function of the piston ring is brought about by the gas pressure above and behind the piston ring, which forces it （） against the bottom of the ring groove, and （） against the cylinder wall.A
upwards；inwardsB
upwards；outwardsC
downwards；inwardsD
downwards；outwards
考题
单选题If the back clearance of a piston ring is excessive,（）A
compression pressure in the cylinder will be higherB
carbon will accumulate behind the ringC
combustion gases will penetrate beneath the ring landD
piston side thrust will be increased
考题
单选题Which of the following conditions would cause carbon deposits to form in the piston ring belt of a diesel engine?（）A
faulty combustionB
excessive ring temperatureC
over lubricationD
all of the above
考题
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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