全国海船船员统考指南丛书.ppt

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1、轮机工程学院辅机教研室,轮机英语考试强化复习（3000KW及以上船舶二管轮/三管轮）,0801 A large,low-speed,main propulsion diesel engine uses sea water to directly cool the _.A.cylinder heads B.exhaust valves C.scavenging air D.injectors,0802 The total starting air capacity required for reversible main engines is to be sufficient for at le

2、ast_.A.six consecutive starts B.eight consecutive starts C.ten consecutive starts D.twelve consecutive starts,0803 Most fuel injection nozzles are opened by_.A.fuel oil pressure B.a cam operated follower C.a spring-loaded pressure plate D.timing gears keyed to the crankshaft0804 The lube oil pump us

3、ed in a diesel engine is a_.A.volute pump B.centrifugal pumpC.diaphragm pump D.gear pump,*0805 When a waste heat boiler is installed in the exhaust of a main propulsion diesel engine,the exhaust gas bypass would be used_.A.at high loads to prevent overheating B.at low loads to prevent corrosion in t

4、he boiler(防低温腐蚀)C.during periods of high steam demand D.when the turbocharger is in operation,*0806 Which bearing half will receive the greatest load in a two-stroke/cycle diesel engine?A.Lower half of the connecting rod bearing at the crankshaft end of the rodB.Upper half of the main bearingC.Lower

5、 half of the piston pin bearing in the connecting rodD.All bearing halves share an equal load*如果是二冲程机,最大的负载由十字头轴承的下半瓦承受.,0807 A naturally aspirated diesel engine at full throttle will have an intake manifold pressure_.A.slightly less than atmospheric pressure B.approximately equal to exhaust manifol

6、d pressure at all times C.that is widely fluctuating constantly D.decreasing as engine load increases*at full throttle以最高速度,0808 During the fuel injection period,fuel pressure must exceed cylinder gas pressure to _.A.ensure penetration(穿过,渗透)and distribution of the fuel in the combustion chamber B.e

7、nsure the needle valve is flushed clean during each injection C.prevent combustion gas blowback into the open needle valve D.prevent reflected pressure waves when the needle valve closes,*0809 The overspeeding of the diesel engine driving an electric generator could cause_.A.low voltage trip to trip

8、(低电压解列)B.reverse power trip to trip(逆功率跳闸)C.damage to windings D.excessive exhaust temperatures,0810 An increase in the air inlet manifold pressure of a diesel engine will result in a/an _.A.decrease in maximum cylinder pressure B.increase in ignition lag滞后 C.decrease in fuel consumption per horsepo

9、wer-hour D.decrease in exhaust manifold pressure,0811 For a continuous operation diesel engine,a duplex filter unit would be the best arrangement because_.A.changing filter elements would not interrupt engine operation B.filtering occurs twice in each pass of oil through the system C.clogging will n

10、ot occur D.dropping pressure is half of that through a single filter unit,0812 The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and_.A.reduce water temperature B.reduce water turbulence动荡 C.provide an air cushion(空气室)D.allow for an in

11、crease in water volume as the engine warms up(缓冲),0813 To minimize corrosion,fuel oil strainer disks碟片,spacers衬套 and scraper blades 刮片are made of _.A.brass B.copper C.iron D.monel metal or stainless steel(蒙乃尔铜-镍合金)*edge-type filter,0814 Which of the following statements describes the function of an

12、expansion tank in a diesel engine cooling system?A.Maintains a constant head on the system.B.Reduces the likelihood of air or steam pockets formation.C.Provides a low pressure point for the addition of makeup cooling water.D.All of the above.,0815 Prior to lighting off a cold automatically fired aux

13、iliary boiler,you should_.点火(完成)A.check and regulate the water level B.close the air cock once fires are lit C.blow down the gauge glass D.crack the steam stop to assure protective steam flow,*0816 One method of constructing large marine diesel engines and reducing the total engine frame weight is t

14、hrough_.A.casting interlocking components B.welding plates to form sections for assembly C.forging integral components D.case hardening表面硬化integral components*与铆接比较,0817 Which of the following statements is true concerning an oil cooler?A.The oil temperature is less than the cooling water temperatur

15、e.B.The oil pressure is less than the cooling water pressure.C.The oil pressure is greater than the cooling water pressure.D.The oil flow control valve is always installed in the oil input line.,0818 The device allowing for the change in volume of the cooling water in a propulsion diesel engine clos

16、ed cooling system is the_.A.fresh water expansion tank B.sea water expansion tank C.thermostatic expansion valve D.jacket water cooler accumulator,0819 Scavenging in a four-stroke/cycle diesel engine occurs during the_.A.last part of the exhaust stroke,and the first part of the intake stroke B.last

17、part of the intake stroke only C.early part of the injection stroke only D.early part of the power stroke0820 The color of the exhaust from a diesel engine should be_.A.clear B.hazy light brown C.hazy light blue D.hazy light grey,0821 In a large,slow-speed,main propulsion diesel engine,which of the

18、parts listed is under tension when the engine is running?A.Bed plate B.Column C.Entablature D.Tie rod,0822 The lube oil cooler is located after the lube oil filter in order for_.A.the filter to operate more efficientlyB.the lube oil cooler to be bypassedC.positive lube oil pump suction to be assured

19、D.galvanic action in the cooler to be minimized 电位差引起的腐蚀*过滤前冷却液体流动性差，过滤效果就差,0823 The highest pressure in any closed diesel engine freshwater cooling system is at the _.A.jacket water outlet B.expansion tank inlet C.heat exchanger inlet D.cooling water pump outlet,0824 Concerning diesel propelled ves

20、sels,the astern power is to provide for continuous operation astern_.A.equal to that available for ahead operation B.at 70 percent of the ahead rpm at rated speed C.while underway and under all normal conditions D.at 70 percent of the ahead rpm of average continuos sea speed,0825 In a two-stroke/cyc

21、le diesel engine,the process of scavenging begins as the_.A.piston nears and passes TDC B.latter part of the down stroke C.piston passes BDC D.early part of the down stroke*开始扫气是在活塞下行时扫气口一打开就扫气,0826 If the fire goes out熄火in an automatically fired auxiliary boiler and the burner continues to supply f

22、uel,there is a potential danger of_.A.overpressure and dry firing B.a severe furnace explosion C.spalling(散裂)damage to the brickwork(耐火砖)D.heat damage to the atomizer,0827 Improper maintenance of an automatic auxiliary boiler oil burner could result in _.A.fuel pump failure B.fan motor failure C.inc

23、reased feed-water consumption D.decreased boiler efficiency,0828 The bearings used to support the crankshaft are generally called_.A.line shaft bearings B.connecting rod beatings C.main bearings D.support bearings,0829 With respect to the flow of lubricating oil through a diesel engine,the lube oil

24、coolers are located after filters in order to_.A.allow filtration of less viscous oil B.decrease the pressure drop across the filter C.improve overall filtration(过滤)D.all of the above,0830 In any diesel engine closed freshwater cooling system,the lowest pressure exists at the _.A.jacket water outlet

25、 B.cooling water pump outletC.heat exchanger outlet D.expansion tank atmospheric vent,0831 Maintaining the lowest possible scavenging air temperature at all times is not recommended due to the possibility of the_.A.air charge density becoming too highB.piston crown surfaces becoming too coldC.format

26、ion of excessive quantities of condensateD.compression pressure being greatly reduced,0832 After a normal,or safety shutdown,automatic combustion control systems for an auxiliary boiler are designed to prevent the immediate re-firing of a burner in order for the_.A.furnace to be re-purged(再次扫气)B.ele

27、ctric charge to buildup in the igniter C.fuel pump to restart D.drum level to stabilize,*0833 Passages are drilled in the crankshafts of diesel engines to provide lubricating oil to the _.A.main bearings B.connecting rod bearings C.piston pin bushings D.All of the above,0834 The outlet from an expan

28、sion tank of a closed freshwater cooling system should be piped to the_.A.cylinder head water outlet header B.cylinder jacket inlet main C.heat exchanger inlet connection D.jacket water pump suction line0835 The intake valves in a diesel engine are reseated by_.A.cam followers B.push rods C.combusti

29、on gases D.valve springs,0836 The main function of tie rods in the construction of large,low speed diesel engines is to _.A.stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength B.accept most of the tensile(拉力)loading that results from the firing forces devel

30、oped during operation C.mount the engine frame securely to the hull to prevent shaft coupling misalignment D.connect the crosshead solidly to the piston rod,0837 On most modern diesel engines,the main and connecting rod bearings receive their lubricating oil by_.A.banjo feed B.splash feed C.gravity

31、feed D.pressure feed0838 The expansion tank in a diesel engine closed freshwater cooling system is located at _.A.the highest point in the system B.the lowest point in the system C.near the floor D.plate level or near the tank top level,0839 When accumulated carbon at the air inlet ports of a two-st

32、roke/cycle diesel engine is being removed,you should take care to avoid carbon_.A.entering the cylinder B.particles becoming lodged(搁住,卡住)under the intake valves C.entering the water jacket D.particles entering lube oil,0840 Lubricating systems for diesel engines are usually designed to initially pr

33、ovide lube oil to the engine_.A.camshaft bearings B.main bearings C.piston crowns D.cylinder walls,0841 If the valve tappets in a diesel engine are set at greater clearances than those specified by the engine manufacturer,those valves will_.A.open late and close earlyB.open late and close lateC.fail

34、 to open when the engine is coldD.fail to open at normal operating temperature,0842 Regarding a Diesel engine crankcase,the general arrangement and installation should preclude(避免,排除)the possibility of_.A.free entry of air to the crankcase B.water entering the crankcase while engine wash-downs 彻底冲洗a

35、re being performed C.excessive oil leakage during periods of increased blow-by 窜气 D.sub-cooling 局部冷却internal components,0843 A diesel engine crankcase ventilation system曲轴箱通风(排除漏入的燃烧产物)_.A.prevents spark generation B.removes combustible gases C.determines the level of combustible gases D.provides in

36、ert gas惰性气体generation in crankcase,0844 Increasing the valve clearance between a valve stem and rocker arm,will result in the valve_.A.closing laterB.opening soonerC.staying open for a shorter period of timeD.staying open for a longer period of time,0845 What function is provided by the crankcase ve

37、ntilation system on some diesel engines?A.Increases the sludge forming tendency of lube oil.B.Prevents the accumulation of combustible gases.C.Improves lube oil cooling.D.Improves cold weather starting.,0846 Lubricating oil is supplied to the crank-pin bearings in a marine diesel engine by _.A.inter

38、nal crankshaft passages B.immersion沉浸 in oil C.splash lubrication D.injection lubrication,0847 The fuel supply system to an automatic auxiliary boiler,will be automatically shutdown if the boiler_.A.salinity is abnormally high B.steam demand is too highC.water level is abnormally low D.feed-water fl

39、ow is low,0848 In readying an auxiliary water-tube boiler for a routine hydrostatic test,which of the following procedures should be undertaken prior to filling the boiler with fresh water?A.The safety valve escape piping should be disconnected from the valve body and a blank inserted.B.The boiler v

40、ent valves should be opened.C.All handhole/manhole covers should be tightened up as much as possible to preclude any leaks.D.All of the above.,0849 Which of the following conditions could cause the feed pump for an auxiliary boiler to lose suction?A.Increased suction head pressure.B.Decreased feed w

41、ater temperature.C.Pump re-circulating line being open too much.D.Excessive feed water temperature.,0850 The crankcases of many diesel engines are kept under a slight vacuum 稍具负压to_.A.improve fuel economy B.increase the air charge velocity C.reduce the risk of explosion D.all of the above,0851 The r

42、ate of cylinder lubricating oil metered to each cylinder of a large low-speed main propulsion diesel engine is_.A.the same,whether at sea,or during maneuvering B.adjusted during each hour of operation while at constant RPM C.higher at sea than while maneuvering D.lower at sea than while maneuvering,

43、0852 On a medium-speed main propulsion diesel engine,the crank-pin or crank journal bearings receive lubricating oil from_.A.a spindle lubricator B.an oil jet C.internal splashing D.drilled passages in the crankshaft,0853 Fins are installed on the generating tube surfaces in waste heat boilers to_.A

44、.prevent soot fires in the exhaust systemB.prevent exhaust gas erosion of the tubesC.increase the velocity of exhaust gas flowD.increase the rate of heat transfer,*0854 The crankcase of many diesel engines are kept under a slight vacuum by the_.A.scavenging action of the piston B.piston type vacuum

45、pump taking suction off a differential manometer差压计 C.gland exhausting manometer D.crankcase exhaust fan排气风扇,抽风机,0855 Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?A.Splash B.Gravity C.Pressure D.Bypass,08

46、56 Which of the following conditions can cause above normal air temperature to develop in the intake manifold of a four-stroke/cycle turbo-charged diesel engine?A.Clogged air intake filters B.Piston blow-by C.A defective after-cooler后冷却机 D.Faulty exhaust valves,0857 If the feed pump for an auxiliary

47、 boiler fails to deliver the feed water to the boiler,the cause maybe_.A.high steam pressure in the boiler B.abnormally high feed water temperature C.abnormally high boiler water temperature D.steam demand exceeding feed pump capacity,0858 Lubrication for the main reduction gears used with diesel en

48、gines is usually supplied by_.A.oil from the main engine sump B.an independent lube oil system C.the stem bearing head tank D.the stem bearing sump tank,0859 When there is a flame failure in an automatically fired auxiliary boiler,the_.A.air supply is shut off B.fuel supply is shut offC.water supply

49、 is shut off D.safety valve lifts,0860 Excessive vibration of an automatically fired auxiliary boiler can be caused by_.A.air or water in the furnace B.combustion pulsesC.fuel oil pump failure D.flame failure,0861 Cooling the intake air supplied to a diesel engine will_.A.reduce mean effective press

50、ure B.decrease average compression pressure C.decrease air charge density D.increase power output,0862 The water in an auxiliary boiler should be tested for chloride content to determine _.A.total dissolved solids B.salt contaminationC.water hardness D.chlorine contamination,0863 The concentration o