单选题（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.ADiesel oilBHydraulic oilCLube oilDMineral oil
单选题
（） is sometimes used for piston cooling since leaks into the crankcase would not cause problems.
A
Diesel oil
B
Hydraulic oil
C
Lube oil
D
Mineral oil
参考解析
解析：
暂无解析
相关考题：
What is head tank in the closed cooling water system used for?A.for the release of air from the cooling waterB.providing expansion room for heated cooling waterC.a place for implementing water and water treatment agentD.all of the above
A crack in a cylinder liner can be caused byA.worn piston ringsB.installation of undersized sealing ringsC.operating the engine at low loadsD.restricted cooling water passages
Piston cooling fins are locatedA.atop the piston crownB.beneath the piston crownC.at the base of the piston skirtD.inside the cylinder liner cooling water jacket
Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system?A.Baffle plates that have been bent during prior removalB.Leaks m the cooler tube nestC.Operating the engine while maintaining a high sea water outlet temperatureD.A punctured sea water strainer supplying cooling water to the heat exchanger
Which of the following is used in an IBM Blade Center to provide cooling？（）A、Fans for each bladeB、Chilled WaterC、BlowersD、Freon
单选题What is head tank in the closed cooling water system used for?（）Afor the release of air from the cooling waterBproviding expansion room for heated cooling waterCa place for implementing water and water treatment agentDall of the above
单选题Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.Aexcessive crankcase pressureBexcessive lube oil temperatureCcontamination of the lube oil by waterDcontamination of the cooling water by lube oil
单选题For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.Aoil sprayBoil bathCoil control ringsDdrilled passage through the camshaft
单选题The piston crown employs the usual jet-shaker principle with an arrangement of cooling bores in the crown so that the surface temperatures of the crown are moderate with a very even distribution（）Awater coolingBoil coolingCair coolingDcombined cooling
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What is commonly used to create turbulence in a diesel engine combustion system?（）AShape of the piston crownsBIncreasing the compression ratiosCIncreasing the piston crownsDIncreasing the turbocharger gear ratio
单选题There is a （） system lubricating the running gear and cooling the piston and sometimes lubricating the cylinders.ArecirculatingBtotal lossCcoolingDrefrigeration
单选题Low compression in a diesel engine could be caused by（）Aworn or broken cylinder liner sealing ringsBhigh cooling water temperatureCworn or broken piston ringsDlow fuel oil pressure
单选题As to the piston cooling, of the following, which statement is not true?（）ABecause the piston is exposed to very high temperature, it must be cooledBThe lower the piston cooling temperature is, the better it isCBoth water and lube oil can be used as coolantDOne of the piston cooling methods is vibration cooling, with better effect
单选题A separate piston cooling system is used to limit any contamination （） piston cooling glands（） the piston cooling system only.Abetween；toBeither；orCfrom；toDneither；nor
单选题The function of the piston compression rings used in a diesel engine is to （）Aseal the space between the piston and linerBtransmit heat from the piston to the cylinder linerCreduce the amount of combustion gas blow-byDall of the above
单选题Persistent knocking of one cylinder of a diesel engine ceases when the fuel supply to that cylinder is securedThis problem may be a result of （）Alow loading of that cylinderBfaulty combustion in that cylinderCsluggish piston ring actionDexcessive piston cooling
单选题If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.Aloss of suction in the circulating pumpBleak in the primary cooling systemCbroken raw water pump shaftDburned or cracked piston in one cylinder
单选题Separation cloths may be used to（）.Aabsorb moisture from hygroscopic cargoesBfill gaps between layers of cargoCwrap cargo that leaks from packagingDkeep bagged cargo leakage from contacting the deck
单选题Compensated flow control or constant flow valves are used in hydraulic systems to（）Acompensate for major leaks in the systemBmaintain the original fluid viscosityCallow for changes in pressure and temperature within the systemDassure constant fluid temperature
单选题The piston cooling system may employ similar components, except that a drain tank is used instead of a head tank That means this system （）.Adoesnt use a drain tank but a head tankBuses a drain tank not head tankCuses a drain tank and a head tankDuses neither a drain tank nor a head tank
单选题An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.Acause loss of hydraulic oil from the systemBresult in extreme damage to the pumpCcause damage to the pump ff not continually drained from the pump casingDresult in the system high side pressure to substantially drop off
单选题Piston compression rings used in a diesel engine function to （）Atransfer heat from the cylinder to the pistonBscrape oil from the sides of the pistonCseal the combustion space from the crankcasesDprevent any piston contact with the cylinder liner
单选题The piston cooling system may employ similar components, except that （） is used instead of a head tank.Aa sump tankBa feed wellCa double bottom tankDa drain tank
单选题Diesel engine piston seizure can be caused by （）Apoor cooling of cylinder wallsBimproper cooling of the pistonCinsufficient piston lubricationDall of the above
单选题Piston cooling fins are located（）Aatop the piston crownBbeneath the piston crownCat the base of the piston skirtDinside the cylinder liner cooling water jacket