单选题The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）Aquantity of air it takes in and retains in the cylinders during a given time periodBproportion of trapped air that is utilized in the combustion processCthermodynamic efficiency of the engine cycleDall of the above
单选题
The power developed by a large slow-speed main propulsion diesel engine is dependent upon the （）
A
quantity of air it takes in and retains in the cylinders during a given time period
B
proportion of trapped air that is utilized in the combustion process
C
thermodynamic efficiency of the engine cycle
D
all of the above
参考解析
解析：
暂无解析
相关考题：
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
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
单选题The rate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is （）Athe same, whether at sea, or during maneuveringBadjusted during each hour of operation while at constant RPMChigher at sea than while maneuveringDlower at sea than while maneuvering
单选题On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）Adial indicatorBoutside caliperCbridge gaugeDtram rod
单选题While underway, which of the following would be the FIRST step in reversing a direct reversing large, low-speed, main propulsion, diesel engine?（）AManually trip the over-speed deviceBInterrupt the fuel flow to the engineCDisengage the safety interlockDSlide the camshaft to the neutral position
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Typical marine propulsion plants include（） directly coupled to the vessel’s single large-diameter, fixed-pitch propeller.Aa single, long-stroke, slow-speed, turbocharged, two-stroke diesel engineBa single, long-stroke, medium-speed, turbocharged, four-stroke diesel engineCtwo medium-speed, turbocharged, four-stroke diesel enginesDa variable-speed AC generator
单选题The opening of an exhaust valve on a modem, large, low-speed, main propulsion diesel engine may be actuated by （）.Adirect action of cam shaftBcompressed air pressureChydraulic “push rods”Ddirect action of the main piston moving down
单选题In order to start a large, low-speed, main propulsion diesel engine on high viscosity fuel after an extended shutdown, the （）Afuel must be preheatedBintake air should be preheatedClube oil outlet temperature should be increased 20℃ above normalDnone of the above
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During maneuvering operations for a direct reversing large, low-speed, main propulsion diesel engine, which of the following actions is used to stop the shaft from turning prior to reversing the engine rotation?（）AFlywheel inertiaBAdmission of starting airCThe way of the vesselDsecuring of fuel to the cylinders
单选题In a large, slow-speed, main propulsion diesel engine, which of the parts listed is under tension when the engine is running?（）ABed plateBColumnCEntablatureDTie rod
单选题Large, two-stroke/cycle, main propulsion, diesel engine cylinders can be successfully pressure charged during normal operation, by using the （）.Aexhaust gas temperature systemBexhaust load systemCconstant or pulse pressure systemDconstant volume system
单选题A large, low-speed, main propulsion diesel engine uses sea water to directly cool the （）.Acylinder headsBexhaust valvesCscavenging airDinjectors
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When a ship is entering to narrow waterway and the fuel feeding of the main engine is keeping unchanged, which of the following is the wrong conclusion?（）Athe power of main engine will be reducedBexhaust temperature will be increasedCthe speed of the ship will be reducedDthe propulsion characteristic of propeller will keep unchanged
单选题Deck machinery, which is also known as hull machinery, includes all power driven equipment located （）the machinery spaces that is （） with the main propulsion plant.Ainside；associatedBinside；not associatedCoutside；associatedDoutside；not associated
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
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
单选题A possible cause for an individual piston to knock when at TDC on a slow-speed, two-stroke/cycle main propulsion diesel engine could be due to （）Aearly fuel injectionBexcessive bearing play within the running gearCoverloading of the cylinderDall of the above
单选题Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.Athe power strokeBthe compression strokeClow load operation onlyDperiods of standby
单选题Which of the following conditions may need to be reduced when operating a large, low speed, main propulsion, diesel engine at low loads?（）AInjection pressuresBControl air supply pressureCCooling water flow through after-coolersDLube oil temperature