单选题A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.Aregulate the fuel supplyBmaintain a constant fuel viscosity at the fuel valvesCmaintain efficient coolingDalter the fuel density
单选题
A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.
A
regulate the fuel supply
B
maintain a constant fuel viscosity at the fuel valves
C
maintain efficient cooling
D
alter the fuel density
参考解析
解析：
暂无解析
相关考题：
Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.A.The direction of pressure on the journal in four-stroke engine is continuouslyB.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineC.four-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesD.Low-stroke engines usually consume less lube oil than four-stroke engines
A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with .A.a high viscosity indexB.a low viscosity indexC.neutralize acidsD.resist oxidation at high temperatures
Oil oxidation as a result of excessively high lube oil temperature, is harmful to a diesel engine BecauseA.oil foaming will always occurB.large quantities of oil are consumedC.lube oil viscosity is always decreasedD.corrosive by-products are usually formed
Lubrication for the main reduction gears used with diesel engines is usually supplied byA.oil from the main engine sumpB.an independent lube oil systemC.the stern bearing head tankD.the stem bearing sump tank
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.A.large conical springsB.compressed air pressureC.hydraulic pressureD.exhaust gas pressure
In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .A.all of the oil used by the engine through a filterB.some of the oil used by the engine through a filterC.some of the oil used by the engine through a centrifugeD.all of the oil used by the engine through a centrifuge
A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler ______.A.corrosion at low engine loadsB.erosion at high engine loadsC.overload at high engine loadsD.scaling at all exhaust temperatures
单选题The viscosity regulator controls the （） of the fuel oil in order to provide the oil at the correct viscosity for combustion.AtemperatureBpumping rateCpressureDheat
单选题Problems with the diesel engine fuel injection pump are usually caused by（）Aimproper adjustmentBcontaminated fuelCkinked fuel linesDexcessive engine vibration
单选题If the engine can be started and maneuvered on high viscosity fuel, the （）of the fuel reaching the injectors should be raised to such a point that the viscosity is less than the required value, ie27c St.ApressureBtemperatureCviscosityDdensity
单选题A viscosity regulator used for an engine is usually provided in order to （） for an engine burning heavy fuel oil.Aregulate the fuel supplyBmaintain a constant fuel viscosity at the fuel valvesCmaintain efficient coolingDalter the fuel density
单选题The viscosity regulator controls the fuel oil temperature （） provide oil at the correct viscosity for combustion.Ain order thatBbecause ofCin order toDowing to
单选题In some cases facilities may be provided for emergency overriding oil pressure shutdown, if this facility is used, adequate warning must be given to （）.Athe bridge watch-keeperBthe captainCthe chief engineerDthe engine room staff
单选题Oil mist detectors are usually used on board to detect oil mist density within （）.Athe engine crankcaseBthe engine scavenge boxesCdrain tanksDfuel tanks
单选题The sequence of parts in a generally used fuel oil supply system for a main engine is （） (1)tanks in the double bottom (2)centrifuges (3)service tank (4)settling tank (5)viscosity regulatorA(1)-(2)-(4)-(3)-(5)B(1)-(4)-(2)-(3)-(5)C(1)-(3)-(2)-(4)-(5)D(1)-(5)-(4)-(2)-(3)
单选题A diesel engine exposed to widely varying ambient temperatures should use to a lubricating oil with （）Aa high viscosity indexBa low viscosity indexCneutralize acidsDresist oxidation at high temperatures
单选题Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.AThe direction of pressure on the journal in four-stroke engine is continuouslyBpositive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineCfour-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesDLow-stroke engines usually consume less lube oil than four-stroke engines
单选题Diesel engine lube oil diluted with fuel oil is indicated by（）Adecreased viscosityBdecreased pour pointCincreased flash pointDincreased viscosity
单选题The viscosity regulator controls （） in order to provide oil at the correct viscosity for combustion.Athe engines speedBthe engines loadCthe fuel oil temperatureDthe fuel oil flow
单选题Engine fuel pump index is （）.Athe viscosity indexBthe fuel oil contentsCthe starting speedDthe reading at the rack
单选题Which of the following statements is correct concerning diesel engine cooling water systems?（）AEach engine must have its own engine driven cooling water pump capable of providing cooling for all ranges of operationBpropulsion engines with bores exceeding 200 mm are to be fitted with a means to display the cooling water temperature of each cylinderCAt least two independent sea suctions are to be provided for supplying water to the engine jackets or to the heat exchangersDSuitable strain are to be fitted between the circulating pumps and heat exchangers when sea water is used for direct cooling
单选题An operating turbocharged diesel engine that suddenly loses power, is due to a/an（）Arestricted turbocharger air intakeBoil leak into the turbochargerCdribbling injectorDlow fuel viscosity
单选题Cavitation erosion in the cooling water system of a diesel engine usually occurs at the pump impeller, and on the waterside of the （）Afuel nozzle holdersBexhaust value guidesCengine cylinder linersDlow temperature and a low viscosity
单选题Fuel injectors used in heavy fuel oil systems are usually provided with cooling to reduce（）.Acold corrosion of the nozzlesBfuel viscosity for better atomizationCcarbon accumulation on the nozzlesDfuel detonation in the cylinders
单选题About the jacket water, that of the auxiliary engines usually（） is circulated by pumps, and the main engine usually （）Aan engine-driven；as wellBan engine-driven；has an independent pumpCan independent；as wellDan independent；has an engine-driven pump
单选题Fuel oil transfer systems used onboard diesel propelled vessels are required to have （）.Atwo fuel oil transfer pumps provided where one is to be independent of the main engineBtwo fuel oil transfer pumps, with a combined capacity exceeding the maximum consumption of the main engineCengine driven transfer pumps and only used in constant speed applicationsDthe capacity of the engine driven pump exceed the consumption rate of the engine to which it is attached
单选题Oil oxidation, as a result of excessively high lube oil temperature, is harmful to a diesel engine because （）Aoil foaming will occurBlarge quantities of oil are consumedClube oil viscosity is always decreasedDcorrosive by-products are usually formed
单选题The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by （）.Alarge conical springsBcompressed air pressureChydraulic pressureDexhaust gas pressure