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单选题
The primary purpose of oil control rings on a diesel piston is to（）
A
provide a reservoir for cylinder lubrication
B
pump oil into the combustion space for cylinder cooling
C
prevent excessive lubricating oil consumption
D
allow hydraulic oil film formation on the cylinder
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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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The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.A.fed from mechanical lubricatorsB.thrown off from the main bearingsC.supplied from wick fed drip lubricatorsD.flow from a centrifugal or banjo oiler
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单选题If the piston groove drain holes for the oil control rings become clogged, which of the following is likely to occur?（）A
The oil control rings will seal improperly and wear rapidlyB
The piston will overheat due to insufficient lubricationC
Excessive oil will remain on the cylinder wallD
Light brown smoke will emanate from the engine exhaust
考题
单选题Worn main bearings in a diesel engine can result in （）A
decreased compression pressureB
increased lube oil pressureC
lower lube oil temperatureD
excessive leakage past the piston rings
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单选题To function properly, oil control rings used on a diesel engine piston must distribute sufficient oil to all parts of the cylinder wall and must also（）.A
prevent any lubricant from reachingB
prevent excessive lubrication from reaching the combustion spaceC
Provide metal-to-metal contact to seal the cylinder against blow-byD
assure a positive means of scraping carbon accumulation from the cylinder
考题
单选题The film of oil between the rings and the liner is not only essential for the lubrication but also plays an important part in achieving （）.A
an oil sealB
removing heatC
a gas sealD
cooling the piston
考题
单选题In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）A
wide compression rings are usedB
oil rings are located above the pistonC
chromium plating is used on all piston ringsD
oil rings are located near the bottom of the piston skirt
考题
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
scuff resistant piston rings
考题
单选题For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.A
oil sprayB
oil bathC
oil control ringsD
drilled passage through the camshaft
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Improperly fitted piston rings in a diesel engine can cause（）A
excessive lube oil consumptionB
lower than normal lube oil temperatureC
higher than normal exhaust back pressureD
excessive crankshaft end play
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 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
考题
单选题In a medium speed diesel engine, a trunk type piston may be cooled by（） Ⅰ.oil circulation though passages in the piston crown Ⅱ.heat transfer through piston rings and liner wallA
Ⅰ onlyB
Ⅱ onlyC
either Ⅰ or ⅡD
neither Ⅰ or Ⅱ
考题
单选题When inspecting piston rings through the ports of a two-stroke/cycle diesel engine, black areas on the sealing surfaces are the result of （）A
insufficient lubricationB
improper piston coolingC
blow-byD
overload operation
考题
单选题The main function of piston compression rings is to （）A
prevent excessive cylinder liner wearB
reduce friction losses in the engineC
seal the space between the piston and the linerD
limit upward flow of lube oil into the combustion space
考题
单选题Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）A
increase the liner area covered by the oil filmB
maintain an oil film on the lower liner where scuffing is prevalentC
keep excess oil away from intake and exhaust portsD
help cushion piston skirt side thrust by providing a hydrodynamic oil wedge
考题
单选题Scuffed cylinder liner surfaces in a diesel engine can result form（）A
starting the engine hotB
knurling the piston skirtC
operating an overheated engineD
using scuff resistant piston rings
考题
单选题The function of the piston compression rings used in a diesel engine is to （）A
seal the space between the piston and linerB
transmit heat from the piston to the cylinder linerC
reduce the amount of combustion gas blow-byD
all of the above
考题
单选题The main purpose of the piston oil scraper rings is to （）.A
seal the space between the piston and the linerB
reduce the amount of lube oil burned in the combustion chamberC
transmit heat from the piston to the cylinder linerD
damp out fluctuations of the piston side thrust
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（）A
gapB
sideC
backD
radial
考题
单选题Combustion gases formed in the cylinder of a diesel engine are prevented from blowing past the piston by （）A
cylinder valvesB
compression ringsC
piston skirtsD
oil rings
考题
单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
remove oil from the cylinder combustion space
考题
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
考题
单选题When installing rings on a diesel engine piston, you should check the ring（）A
diametrical tensionB
gap clearanceC
radial thicknessD
face thickness
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单选题Excessive piston ring wear in a diesel engine will cause（）A
high lube oil viscosityB
increased lube oil consumptionC
low lube oil temperaturesD
high firing pressures
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单选题If sludge accumulates on the underside of a diesel engine piston, it will（）A
cause blow-byB
chemically attack the piston skirtC
form an emulsion of lube oil and waterD
raise the piston temperature
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