47期轮机英语考试题Word下载.docx

1、C6.It is easier to replace a dry cylinder liner than a wet one because_.A.of the thin wall thickedssB.honing makes it easier to maintain the desired oil filmC.water seals are not requiredD.it fits more loosely due to a decrease in heat transfer through the composite wall D7.A main bearing consists o

2、f two shells which are secured by means of studs and_.A.tie rods B.though bolts C.lead wires D.bearing capsC8.However fast or slow the combustion rate,it is still a_between carbon,hydrogen,sulph and oxygen that releases heat.A.physical deformation B.state exchangeC.chemical reaction D.coalescenceA9.

3、During the fuel injection period,fuel pressure must exceed cylinder gas pressure to_.A.ensure penetration and distribution of the fuel in the combustion chamberB.ensure the needle valves is flushed clean duringeach injectionC.prevent combustion gas blowback into the open needle valveDprevent reflect

4、ed pressure waves when the neddle valve close.B10.In a diesel engine lube oil system ,which of the following parts should be lubricated first?A.Camshaft bearings B.Main bearings C.Piston crowns D.Cylinder walls B11.In a diesel engine closed freshwater cooling system,the amount of coolant flowing thr

5、ough the heat exchanger is controlled by the _,A.suction pressure regulator B.thermostatic bypass valve C.sea water temperature D.water level in the expansion tankC12.Which of diesel engine compnents listed increases air density and helps to improve engine operating efficiency?A.Impeller B.Air bottl

6、e C.Air cooler D.Exhaust diffuserB13.A large two-stroke/cycle direct reversing diesel engine is to be revered. Prior to the admission of starting air you must_.A.line up the engine for restarting with diesel oilB.reposition the fuel injection camC.change the intake and exhaust valve cam positionsD.p

7、lace the starting cam in the intermediate positionC14.Which of the listed governer characteristics will greatly affect the load sharing relationship between paralleled diesel generators?A.Sensitivity B.Power C.Speed droop D.Compensation C15.Thermocouple pytometers are used on large,main propulsion d

8、iesel engines to indicate the temperature of the _.A.cooling water leaving each cylinder B.fuel oil entering the injectorC.exhaust gases atvarious loactionsD.lube oil at the bearing suppliesB16.After starting a diesel engine,which of the listed oprating conditions should be checked first?A.Air box p

9、ressure B.Lube oil pressure C.Exhaust temperatures D.Raw water pressureC17.To shut down a diesel engine after it exceeds the set maximum speed ,which type of device listed should be used?A.Speed limiting governor B.Over-speed governor C.Over-speed trip D.Over-speed relay A18.The treatment of the fue

10、l oils involves storage,heating,filtering and_.A.centrifuging B.pressurizing C.atomization D.ignitingB19.A propeller,in order to operate efficiently,must rolate at a relatively_ speedA.high B.low C.fast D.lowlyA20.Latcnt heat changes the_ of water.A.physical-state B.temperature C.atmospheric-pressur

11、e D.sensible-pressureC21.The primary function of a flame safeguard system, as used on am automatically fired auxiliary boiler,is toprevent_.A.accidental dry firing and overpressure B.uncontrolled fires in the furnace C.explosions in the boiler furnace D.overheating of the pressure partsA22.Improper

12、maintenance of the fule oil burners in an automatically fired auxiliary boiler could resuit in_.A.increased fule consumption B.increased feed-water consumption C.fule pump failure D.combustion control systerm failureA23.Bumer ignition failure in an automatically fired auxiliary boiler could result i

13、n_.A.a burned out solenoid in the oil supply valva B.high tempersure excess air C.incorrectly setting the hot-welldump valveD.an incorrectly positioned burner smubber（缓冲器）relaryB24.If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler,the cause may be_.A.high steam p

14、ressure in the boiler B.abnormally high feed-water tempreture C.abnormally high boiler water temperature D.steam demand exceeding feed pump capacity0C25.Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid_pressure.A.depending on B.in relative C.

15、regardless D.because ofC26.A supr gear pump should be operated with the discharge valves_.A.slightly opened B.thorttled C.fully opened D.halfway openedC27.An independent bilge suction is reqired for_.A.ballast tanks B.sludge tanks C.machinery space bilges D.cargo hold bilgesA28.To thoroughly pump ou

16、t the bilges ueing a horizontally mounted centrifugal pump,the_.A.pump must always be primedB.volute must impart a radial and rotary motion of the waterC.suction side connectin must guide the liquid to the lantern ringsD.stuffing box should not be allowed any water leakageB29.An inadequate reciproca

17、ting bilge pump discharge ismost often caused by_.A.defective safety valves B.clogged suction stainersC.scarred cylinder walls D.clogged drain valvesB30.In a compression refrigeration plant,the hot,high pressure refrigerant gas is cooled by the sea water and becomes liquid in the_.A.compressor B.con

18、denser C.throttle valve D.evaporatorD31.The_only allows for adjustment of temperature in each room by the occupant manually controlling the air volurne admitted.A.central air conditioning system B.high velocity system C .low velocity system D.single duct systemD32.The opening of the humidifiers valv

19、a of air-conditioner should be_,when the circurnstanc temperature is raised to above 58 0C in the winter.A.desreased B.increased C.fixed D.closedC33.Under normal conditions,the quantity of air circulation becomes less and less.Whatis the reason?A.dirty dclivery ducts B.too mush refrigerantC.the foul

20、ing filters D.high temperature outsideD34.When bilge water is heated in a holding tank,which one of the following statementsis not accurate?A.The relative high temperature facilitates primary gravity separationB.Most of the oil and organic solvenits are rised to the top layerC.The relative high the

21、temperature is, the more the top oil wil be collectedD.The normal high temperature has little use on the separation of emuslsified oil.C35.If scparating efffct of the oily water separeator is not good, we can improve it by_.A.flushing separator with cold water B.increasing bilge water supply flowC.h

22、eat oily wather properlyD.opening manual oil discharge vavleC36.Which is the pollution prevention equipmen?A.booster pump B.evaporator C.incinerator D.coolerB37When does auxiliary burner of rotary nozzle type incinerator put into use? .when igniting .the waste oil for dealing-water is too mush .befo

23、re stopping incineratorA.+ B.+ C.+ D+A38.When anacrobic bacteria cinvert the sewage to an inert sludge,_.A.no oxygen is needed B.oxygen is necessaryC.oxygen is given off D.no gas is produced.C39.For a I.O purifier, if the back pressure of the oil outlet ie too high, the interface between oil and wat

24、er in the bolw will_.A.be interrupted B.move downwardsC.move outwards D.retain original positionA40.When scperating the lube oil without additive,it is ususlly working with hot waher; the aim isto remove_from it.A.acid B.oil sludge C.mechanical impurity D.salinityC41. If the bolw of a disk type cent

25、rifugal purifier when opened as a separator is not primed the_.A.oil has a tendency to emulsify in the bowlB.purifier wil act as a clarifier at the discharge ringC.oil wil act lost through the water discharge portsD.oil solids will be dsposited only at the intermediate top diskB42.Tube leaks in the

26、distillate cooler of a two stage flash evaporator will result in_.A.loss of secong stage vacuum B.contamination of the distillateC.lower feed inlet tempercratureD.contarnination of the second stage condenserB43.Small droplets of water entrained in the flashed vapor produced in a flash-type evaporato

27、r,are removed by the_.A.spray pipes B.demisters C.condensers D.splash bafflesB44.Overflow valve usually be used to_.A.control the fluid flow through itB.prevent the pressure before overflow valve over the specified valueC.make the pressure after overflow valve steadyD.control the direction of oil fl

28、owA45.Among the basic categories of equipment, which of the following are used to convert menchanical into hydraulic energy?A.the hydraulic pumps B.valvesC.hydraulic cylinders D.hydraulic motorsC46.Cargo handing unit is rated according to the_.A.cargo crane B.jib C.safe working load D.oil pressureC4

29、7.The part of the anchor windlass that cngages the anchor chain for lifting is called the_.A.warping head B.fairleadC.wildcat D.capstanD48.In automatic_,the which may be overhanled and wire is piad off the barrel at a pre-determined maximum tension.A.cranes B.windlass C.capstans D.mooring winchesD49.The major source of chemical contaminants in hydraulic fluid is_,A.microscopic steel shavings B.abrasiv