单选题The main factor which determines the output of each cylinder is （）Athe cylinder weightBthe cylinder boreCthe cylinder lengthDthe cylinder cover
单选题
The main factor which determines the output of each cylinder is （）
A
the cylinder weight
B
the cylinder bore
C
the cylinder length
D
the cylinder cover
参考解析
解析：
暂无解析
相关考题：
Object-oriented analysis(OOA)is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is(71). It determines how the various results are computed by the product and presents this information in the form. of a(72)and associated scenarios. The second is(73), which determines the classes and their attributes. Then determine the interrelationships and interaction among the classes. The last step is(74), which determines the actions performed by or to each class or subclass and presents this information in the form. of(75).A．use-case modelingB．class modelingC．dynamic modelingD．behavioral modeling
Each cylinder is closed at the top by a _____, made of a special heat-resistant steel.A.cylinder linerB.coupling flangeC.cylinder coverD.piston crown
Because the timing of injection is crucial, _____ mounted on the camshaft, which is driven by the crankshaft are used to operate the fuel pumps, one of which is provided for each cylinder.A.gearsB.ramsC.barrelsD.cams
Object-oriented analysis (OOA) is a semiformal specification technique for the object-oriented paradigm. Object-oriented analysis consists of three steps. The first step is(71) . It determines how the various results are computed by the product and presents this information in the form. of a(72) and associated scenarios. The second is(73) , which determines the classes and their attributes, then determines the interrelationships and interaction among the classes. The last step is(74) , which determines the actions performed by or to each class or subclass and presents this information in the form. of (75) .A．static modelingB．dynamic modelingC．use-case modelingD．behavioral modeling
Which devices are instruments of interpretation and communication between humans and computers?A．main memoryB．input/output devicesC．CPUD．hard disk
Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?A.The viscosity of the fuel.B.The quantity of water to be removed from the fuel.C.The specific gravity of the fuel.D.The quantity of dirt to be removed from the fuel.
第一组： The Wartsila 50DF operates on the lean-bum principle: the mixture of air and gas in the cylinder has more air than is needed for complete combustion. Lean combustion reduces peak temperatures and therefore NOx emissions. Efficiency is increased and higher output is reached while avoiding knocking. Combustion of the lean air-fuel mixture is initiated by injecting a small amount of LFO (pilot fuel) into the cylinder. The pilot fuel is ignited in a conventional diesel process, providing a high-energy ignition source for the main engine. To obtain the best efficiency and lowest emissions, every cylinder is individually controlled to ensure operation at the correct air-fuel ratio and with the correct amount and timing of pilot fuel rejection. Wartsila has developed a special electronic control system to cope with the demanding task of controlling the combustion in each cylinder, and to ensure optimal performance in terms of efficiency and emissions under all conditions by keeping each cylinder within the operating window. Stable and well-controlled combustion also contributes to less mechanical and thermal load on the engine components. Current stringent emission regulations demand the reduction of NOx emissions. In an internal combustion engine this means controlling peak temperature and residence time, which are the main parameters governing NOx formations. In the Wartsila 50DF engine, the air-fuel ratio is very high (typically 2.2). Since the same specific heat quantity released by combustion is used to heat up a larger mass of air, the maximum temperature and consequently NOx formation are lower. The mixture is uniform. throughout the cylinder since the fuel and air are premixed before introduction into the cylinders, which helps to avoid local NOx formation points within the cylinder. Benefiting from this unique feature, NOx emissions from the Wartsila 50DF are extremely and comply with the most stringent existing legislation.What is the combustion feature of the Wartsila 50DF?A.Lean air in the cylinderB.Excessive fuel in the cylinderC.Excessive air in the cylinderD.Spark ignition
The main factor which determines the output of each cylinder is _____.A.the cylinder weightB.the cylinder boreC.the cylinder lengthD.the cylinder cover
Object-oriented analysis（OOA.is a semiformal specification technique for the object-oriented paradigm.Object-oriented analysis consists of three steps.The first step is（ ）.It determines how the various results are computed by the product and presents this information in the form of a（ ）and associated scenarios.The second is（ ），which determines the classes and their attributes.Then determine the interrelationships and interaction among the classes.The last step is（ ）,which determines the actions performed by or to each class or subclass and presents this information in the form of（请作答此空）.A.activity diagramB.component diagramC.sequence diagramD.state diagram
What protection method is used in 4F BLSR networks?（）A、Each fiber has half of its SONET capacity reserved for protection.B、Two fibers in the span carry working traffic, while the other two fibers in the span are reserved for protection.C、The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.D、The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.
What protection method is used in 4F MS-SPRing networks？（）A、 Each fiber has half of its capacity reserved for protection.B、 Two fibers carry their full capacities while the other two fibers are reserved for protection.C、 The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.D、 The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.
Which of the following does an astronomical time clock do？（）A、Determines the ambient light at night with a photocell.B、Calculates sunset and sunrise times based on geographical area.C、Determines the start and end of each of the seasons.D、Synchronizes the local time displayed with the official world time.
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The bore of each cylinder is formed in a liner which can be （） when worn out.AweldedBreplacedCdrilled againDbored
单选题A practical way of checking for excessive fuel injection in one cylinder of an operating diesel engine is to （）Afeel the high pressure fuel lineBcheck the cylinder exhausts for white smoke frequentlyCcheck the cylinder exhaust temperatureDisolate each cylinder and inspect the injector
单选题The MINIMUM acceptable size for a towing bridle would be that size in which the safe working load (SWL) of each leg of the bridle is equal to（）.Aone-half the SWL of the main towing hawserBthree-fourths the SWL of the main towing hawserCthat of the main towing hawserDtwice that of the main towing hawser
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 （）Acheck the cylinder exhausts for black smokeBlisten for combustion knock in that cylinderCisolate each cylinder and inspect the injectorDcheck the cylinder exhaust temperature frequently
单选题One factor that determines the frequency of an alternator is the（）.Anumber of turns of wire in the armature coilBnumber of magnetic polesCstrength of the magnets usedDoutput voltage
单选题For Vee-form engines, （） is shaped to given two slopping surface on which （） are placed at the correct relative angle to each other.Athe bottom of the column；the cylinder blocksBthe top of the column；the cylinder headsCthe top of the column；the cylinder blocksDthe bottom of the column；the cylinder heads
单选题Which factor determines the ring dam size for a fuel oil, tubular bowl type, centrifugal purifier?（）AThe viscosity off the fuelBThe quantity of water to be removed from the fuelCThe specific gravity of the fuelDThe quantity of dirt to be removed from the fuel
单选题The main factor determining the output of each cylinder is the cylinder （）.AdensityBboreCweightDmaterial
单选题The amount of fuel delivered for each cycle must be in accordance with the engine load, and the same quantity of fuel must be delivered to each cylinder for each power stroke at that load.Which of the following statements describes this requirement?（）AProper timingBAccurate meteringCSuitable injection rateDSuitable atomization rate
单选题There is an injection pump for each cylinder, which is usually operated once every cycle by （） on the camshaft.Aa gearBa camCa rodDa miler
单选题A-frames are mounted on the bed plate and support （） and cylinder block.Athe main bearingBthe cylinder coverCthe entablatureDthe sump
单选题Which of the fuel injection systems listed uses a spring loaded differential spray needle valve and individual pump for each cylinder?（）ACommon-rail injectionBAir injectionCJerk pump injectionDDistribution injection
单选题The air distributor is conventionally driven by（） and distributes into each cylinder by（） certain sequence.Acamshaft；fresh airBcamshaft；starting airCelectronic motor which is controlled by a computer；fresh airDelectronic motor which is controlled by a computer；starting air
单选题The margin plate is the（）.Aoutboard strake of plating on each side of an innerbottomBouter strake of plating on each side of the main deck of a vesselCplate which sits atop the center vertical keelDuppermost continuous strake of plating on the shell of a vessel
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