网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
单选题
In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.
A
inefficiency
B
oiliness
C
detergency
D
purity
参考答案
参考解析
解析：
暂无解析
更多 “单选题In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.A inefficiencyB oilinessC detergencyD purity” 相关考题
考题
An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with________.A.graphite packingB.sealing compoundC.lubricating oilD.gaskets
考题
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.can t expand when heated
考题
Diesel engines are started by supplying into the cylinders in the appropriate sequence for the required direction.A.cooling waterB.compressing airC.compressed airD.cylinder oil
考题
Cylinders of marine diesel engines are normally cooled by ___ .A.sea waterB.fine mineral oilC.sanitary waterD.fresh water
考题
单选题Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of （）A
less even torqueB
higher cylinder head temperaturesC
fewer power strokes per revolutionD
greater weight/size requirements
考题
单选题Lubricating systems for diesel engines are usually designed to initially provide lube oil to the engine （）A
camshaft beatingsB
main bearingsC
piston crownsD
cylinder walls
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Scuffed cylinder liner wearing surfaces in a diesel engines can result from （）A
chromium plating piston ringsB
knurling the piston skirtC
extended maximum power operationD
applying load to a cold diesel engine
考题
单选题Large marine diesel engines of crosshead construction generally have two systems of lubrication: a total loss system feeding the （） and a recirculation system lubricating the running gear and cooling the piston.A
cylinder liners and piston ringsB
main bearingsC
crankpin bearingsD
turboblower
考题
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
can t expand when heated
考题
单选题Marine four-stroke diesel engines are mainly （）.A
of crosshead typeB
of trunk piston typeC
of low speed typeD
all the above
考题
单选题The most practical way of detecting an overload in one cylinder of an operating large, low-speed ,main propulsion diesel engine is to （）A
check the cylinder exhausts for black smokeB
listen for combustion knock in that cylinderC
isolate each cylinder and inspect the injectorD
check the cylinder exhaust temperature frequently
考题
单选题Cooling water pumps driven by direct reversing diesel engines are usually of the straight impeller vane type pump with a concentric housing to（）A
facilitate bi-directional operationB
provide the greatest pump efficiencyC
prevent pump clogging from marine growthD
prevent cavitation at the pump outlet
考题
单选题To counteract these undesirable effects cylinder oils usually contain additives formulated to impart a high degree of （） and detergency.A
salinityB
alkalinityC
acidD
sanitary
考题
单选题Cylinders of marine diesel engines are normally cooled by （）.A
sea waterB
fine mineral oilC
sanitary waterD
fresh water
考题
单选题One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.A
casting interlocking componentsB
welding plates to form sections for assemblyC
forging integral componentsD
case hardening integral components
考题
单选题A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）A
low TBN valueB
high alkaline reserveC
low flash pointD
high pour point
考题
单选题An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with（）A
graphite packingB
sealing compoundC
lubricating oilD
gaskets
考题
单选题（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.A
Except forB
BesideC
ExceptD
In addition to
考题
单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.A
A common rail engine；conventional enginesB
A conventional engine；common rail enginesC
A marine diesel engine；most other enginesD
A two-stroke engine；four-stroke engines
考题
单选题Fuel injected into a diesel engines cylinder is ignited by （）.A
the heat compressed fuel/air mixture in the cylinderB
the fuel igniterC
the fuel injectorD
the fuel pump
考题
单选题Pistons of marine medium speed diesel engines may be made of （） in order to keep the weight down for balancing purpose at high speed.A
leadB
forged steelC
alloy steelD
aluminum alloy
考题
单选题When comparing different fuels for different engines, the ignition quality of diesel fuel oils becomes a less critical consideration as （）A
the amount of lube oil additives increaseB
piston speeds increaseC
injection pressure decreaseD
engine speeds decrease
考题
单选题Fresh water is used for the cooling of cylinder jackets and （） of the marine diesel engine.A
cylinder coversB
lubricating spaceC
crossheadD
exhaust manifold
考题
单选题Turbocharged four-stroke/cycle diesel engines utilize valve overlap for（）.A
improving cylinder scavengingB
preheating the combustion chamberC
reducing air charge densityD
preventing valve wear
考题
单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）A
BedplateB
BlockC
BaseD
Sump
考题
单选题Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.A
the power strokeB
the compression strokeC
low load operation onlyD
periods of standby
热门标签
最新试卷