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.Acylinder liners and piston ringsBmain bearingsCcrankpin bearingsDturboblower
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 rings
B
main bearings
C
crankpin bearings
D
turboblower
参考解析
解析：
暂无解析
相关考题：
Cylinders of marine diesel engines are normally cooled by ___ .A.sea waterB.fine mineral oilC.sanitary waterD.fresh water
Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is ______.A.entirely constant pressureB.entirely constant temperatureC.a combination of constant volume and constant pressureD.a combination of constant temperature and constant pressure
Vessels required to be equipped with an approved backfire flame arrester are ______．A.Those with diesel enginesB.All those with gasoline enginesC.Those with large engines onlyD.None of the above
单选题In large marine diesel engines cylinder oils usually contain additives formulated to impart the （） to clean the rings and grooves.AinefficiencyBoilinessCdetergencyDpurity
单选题The main function of tie rods in the construction of large, low speed diesel engines is to（）.Astiffen the bedplate in way of the main bearings to increase the engines longitudinal strengthBaccept most of the tensile loading that results from the firing forces developed during operationCmount the engine frame securely to the hull to prevent shaft coupling misalignmentDconnect the crosshead solidly to the piston rod
单选题Marine four-stroke diesel engines are mainly （）.Aof crosshead typeBof trunk piston typeCof low speed typeDall the above
单选题（）, so they are widely used on board ship nowadays.ADiesel engines have more advantages in comparison with gasoline enginesBDiesel engines have more advantages in comparison to gasoline enginesCGasoline engines have more advantages in comparison with diesel enginesDGasoline engines have more advantages in comparison to diesel engines
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（）Afacilitate bi-directional operationBprovide the greatest pump efficiencyCprevent pump clogging from marine growthDprevent cavitation at the pump outlet
单选题Following the failure of one turbocharger on a large, crosshead, main propulsion diesel engine, fitted with multiple turbochargers, which of the following actions should be taken prior to further operation of the engine? （）ABlank off the exhaust gas inlet to the damaged turbochargerBSecure cooling and lubrication to the damaged turbochargerCLock the rotor of the damaged turbochargerDAll of the above
单选题Cylinders of marine diesel engines are normally cooled by （）.Asea waterBfine mineral oilCsanitary waterDfresh water
单选题One method of constructing large marine diesel engines and reducing the total engine frame weight is through （）.Acasting interlocking componentsBwelding plates to form sections for assemblyCforging integral componentsDcase hardening integral components
单选题Today, crankshafts for large 2-stroke crosshead engines are of the （）type.Asemi-builtBbuilt-upCsolid forgedDindividual forged
单选题A large, low-speed, crosshead, main propulsion diesel engine using residual fuel oils must have a cylinder oil having a （）Alow TBN valueBhigh alkaline reserveClow flash pointDhigh pour point
单选题The crankshafts on the large modern 2-stroke crosshead engines are （）big （）makes as a single unit and so are constructed by joining together individual forgings.Aenough；toBtoo；toCsuch；soDso；that
单选题The position of （） on the crosshead on a large diesel engine is determined by dowel pins.Athe guidewayBthe piston rodCthe crosshead shoesDthe interlocked circlip
单选题（）diesel engines generally have two systems of lubrication:（）a total loss system feeding and a circulating system lubricating the running gear and cooling the pistons.ALarge crosshead type；crossheadsBHigh speed；the cylindersCLarge crosshead type；the cylindersDFour-stroke；pistons and cylinders
单选题In diesel engines designed with a crosshead, the motion of the piston rod can be described as （）.Areciprocating at the piston pin, rotary at the crank pinBreciprocating at the crank pin, rotary at the piston pinCstraight reciprocationDstraight rotation
单选题Vessels required to be equipped with an approved backfire flame arrester are（）.Athose with diesel enginesBall those with gasoline enginesCthose with large engines onlyDNone of the above
单选题（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.AExcept forBBesideCExceptDIn addition to
单选题Which of the listed types of starting systems is often used on large, low-speed, direct reversing, main propulsion diesel engines?（）AElectricBHydraulicCAirDAll of the above
单选题Cast iron pistons used in large propulsion diesel engines are constructed with （）Anot taper what so everBthe skirt being tapered and smaller than the crownCthe skirt being tapered and larger than the crownDthe crown being tapered and smaller than the skirt
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.AleadBforged steelCalloy steelDaluminum alloy
单选题Valve cages are used on some large diesel engines to （）Areduce wear on the valve stemBpermit the use of alloy valve seat materialsCreduce heat transfer from the valve seatDfacilitate valve removal for servicing
单选题Modern marine diesel engines using mechanical fuel injection, operate on a combustion cycle which is（）Aa combination of constant volume and constant pressureBa combination of constant temperature and constant pressureCentirely constant pressureDentirely constant volume
单选题Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion phase within the cycle which is（）Aentirely constant pressureBentirely constant temperatureCa combination of constant volume and constant pressureDa combination of constant temperature and constant pressure
单选题In some modern large diesel engines, which of the following is used as the support for the main bearings?（）ABedplateBBlockCBaseDSump
单选题Most large, low-speed, main propulsion diesel engines use duplex lube oil strainer to （）Adecrease the time required between cleaningsBremoves all large and small foreign objectsCensure a positive flow of oil at all timesDensure that all lube oil has been treated twice