轮机英语真题42期 甲类三管轮.docx

1、轮机英语真题42期 甲类三管轮轮机英语真题42期 甲类三管轮中华人民共和国海事局20_7年第1期海船船员适任证书全国统考试题(总第42期)科目：轮机英语试卷代号：805适用对象：无限、近洋航区3000KW及以上船舶二/三管轮（本试卷卷面总分100分，及格分为70分，考试时间为100分钟）答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题,每题10分。一、单项选择题1.The _engine is used for alternators and some times for main

2、 propulsion with a gearbo_ toprovide a propeller of between 90 to 120 rpm.A.four-strokeB.two-strokeC.slow speedD.reversible2.The discharge flow of a reciprocating pump is _.A.steadyB.in pulsationC.continuousD.large3.The cetane number of a diesel fuel oil indicates its _.A.viscosityB.acid contentC.he

3、ating valueD.ignition quality4.Always ensure that the turning gear is_, even at the quay, the wave from other ships mayturn the propeller and thus the engine.A.disengagedB.engagedC.assembledD.disassembled5.Camshafts are usually driven by timing gears or _.A.push rodsB.chain drivesC.rocker armsD.flyw

4、heels6.The cylinder oil is pumped into the cylinder (via non-return valves) when the piston rings pass thelubricating orifices, during_.A.the upward strokeB.the downward strokeC.the power strokeD.the suction stroke7.The total starting air capacity required for reversible main engines is to be suffic

5、ient for a least_.A.si_ consecutive(连续的) startsB.eight consecutive startsC.ten consecutive startsD.twelve consecutive starts8.A dirty diesel engine oil filter element can best be detected by _.A.visual inspection of the elementsB.the pressure drop across the filterC.high lube oil sump temperatureD.d

6、ecrease in oil viscosity from the filter9.Before a marine diesel engine is started the cylinders and pistons must be _.A.cooled to ropriate temperatureB.warmed up gradually to ropriate temperatureC.opened up and renewedD.ground and polished10.A controllable pitch propeller on a diesel driven vessel

7、eliminates the need for _.A.friction clutchesB.disconnect clutchesC.reversing gearsD.reduction gears11.The ma_imum pressure developed by a waste heat boiler is determined by the main enginee_haust _.A.gas positionB.gas temperatureC.pressureD.timing 12._continuously e_tract the crankcase atmosphere,

8、via a pipe system, and move it past asensitive and accurate opacity (不透明)measuring track.A.The oil mist detectorsB.The smoke detectorsC.An oily water monitorD.Oil discharge monitoring and controlling system13.The water in a ing au_iliary boiler should be tested daily for _.A.dissolved o_ygenB.chlori

9、desC.sludgeD.dissolved nitrogen14.A firebo_ e_plosion in an automatically fired au_iliary boiler may be the result of _.A.e_cessive purging before lighting offB.insufficient trail for ignition periodC.a faulty transformer in the ignition circuitD.insufficient purging after lighting off15.A feed pump

10、 for an au_iliary boiler might lose suction if the _.A.boiler water level is lowB.feed-water is too hotC.boiler demand is lowD.feed-water is too cold16.The gear and screw pumps are classified as_.A.variable stroke pumpsB.multistage pumpsC.positive displacement pumpsD.triple-ported pumps17.The pressu

11、re of a liquid leaving the pump can be referred to as the _.A.total headB.discharge headC. positive suction headD.suction head18.Which of the valves listed will be cycled from fully open to fully closed when the handle isturned 90 degree?A.A rising stem gate valveB.A globe s valveC.A check valveD.A

12、butterfly valve19.A pump shaft that is bent or distorted should normally be _.A.repaired by a suitable welding processB.straightened by lying heat and torsionC.reconditioned by metallizing and machiningD.replaced with a satisfactory spare20.A centrifugal pump may fail to deliver water when first sta

13、rted if the _.A.water seal pipe is pluggedB.pump is not primedC.seal ring is improperly locatedD.impeller is flooded21.Which of the follog conditions must e_ist for heat to flow from one object to another?A.The two objects must be in physical contact.B.The two objects must be the same size.C.There m

14、ust be an e_isting temperature differential.D.There must be an e_isting weight differential.22.The dew point of air is reached when the wet bulb temperature is _.A.twice the dry bulb temperatureB.10 above the dry bulb temperatureC.5 above the dry bulb temperatureD.equal to the dry bulb temperature23

15、.If air at 95 dry bulb temperature and 50 relative humidity is conditioned to 75 dry bulbtemperature and 50 relative humidity, it is an e_le of _.A.cooling onlyB.cooling and humidifyingC.cooling and dehumidifyingD.adiabatic(绝热的) cooling24.In order to achieve greater dehumidification(除湿) with an air

16、conditioning system, you should_.I.reduce the cooling coil temperature II.increase the re-heater temperatureA.I onlyB.II onlyC.Both I and IID.Neither I nor II25.Oily water separators are used to ensure that ships dont discharge oil when pumping out _.A.ballast waterB.boiler waterC.bilge waterD.sewag

17、e water26.When started, a plete oily water separating unit is first filled_.The oily water mi_tureis then pumped through the inlet pipe into the coarse separating partment.A.with dirty waterB.with clean waterC.by oily waterD.by mi_ed water27.Which is the pollution prevention equipment?A.booster pump

18、B.evaporatorC.incineratorD.cooler28.The oil sludge is burnt in the _onboard.Ill show you the ashes.A.boilerB.main engineC.au_iliary engineD.incinerator29.Most marine biological sewage treatment plants consist of all the follog statements e_cept_.A.aeration tanksB.settling tanksC.disinfection agentD.

19、anaerobic bacteria (厌氧菌)30.Great care is dedicated to the removal of _from the scavenge air.A.gravityB.viscosityC.densityD.humidity31.Dirty oil must be _before being used again.A.mi_ed with clean oilB.purifiedC.heatedD.strained32.When a vacuum boiling evaporator works, the hot jacket water will pass

20、 over the tube stack and_the sea water passing through the tubes.A.disposeB.dissolveC.heatD.dissipates33.When securing a flash-type evaporator for an e_tended period of time, you should _.A.fill the unit with saltwaterB.fill the unit with descaling poundC.pletely drain the unitD.tightly seal the uni

21、t to e_clude air34.Among the basic categories of equipment, which of the follog are used to allow the hydraulicenergy to be controlled?A.hydraulic pumpsB.valvesC.hydraulic cylindersD.hydraulic motors35.Positive displacement, helical gear(斜齿轮) pumps are well suited for pumping oil because_.A.stuffing

22、 bo_es eliminate the leakage problems usually associated with other gear pumpsB.it is not necessary to closely maintain design clearances with this pumpC.they are essentially self-priming and produce a high suction liftD.these pumps are designed with e_treme tooth angles36.The oil in a cargo ch gear

23、 bo_ should be sled periodically(周期性地) to _.A.prevent the gear bo_ from leakingB.prevent the oil from being inflammable(易燃的)C.make sure it has not bee contaminated(污染)D.make sure the motor bearings are lubricated37.If an anchor dlass has been idle for some time, you should _.A.repack all valve stems

24、B.lubricate it prior to useC.replace the foundation boltsD.balance the warping heads 38.A mooring ch should be equipped with mechanical brakes capable of holding _.A.half the breaking strength of the mooring lineB.the full breaking strength of the mooring lineC.the ma_imum e_pected tension(张力) of th

25、e mooring lineD.50 over the working tension of the mooring line39.Hydraulic cranes must be properly warmed-up before being operated because _.A.warm-up allows the hydraulic system to bee charged with oilB.warm-up allows the relief valves to be properly testedC.hydraulic strainers operate only during

26、 the warm-up periodD.hydraulic fluid must be at the proper viscosity40.The current flog first in one direction and then in another is called _current.A.a rushB.an alternatingC.a directD.an e_citing41.The frequency of an alternator at a given RPM is determined by the _.A.number of turns of wire in th

27、e armature coilB.number of magic polesC.strength of the mags usedD.output voltage42.While paralleling two AC generators using synchronizing(同步的) ls only, both ls willgo dark when the generators are _.A.running at the same speedB.groundedC.of the same polarity(极性)D.in phase43.The load sharing charact

28、eristics of two diesel generators operating in parallel are mostlydependent on their governor _.A.load limit settingsB.idle speed settingsC.speed limit settingsD.speed droop settings44.Electric insulation is made of organic substances and so gradually _with age.A.deterioratesB.increasesC.are fouledD

29、.bees better45.The main generators are connected to _.A.distribution boardsB.section boardsC.emergency switch boardsD.main switch boards46.The operation of _two alternators requires the voltages to be equal and also in phase.A.controlB.series-mountingC.runningD.paralleling47._is a machine by which electrical energy is transformed into mechanical energy.A.An alternatorB.An electric motorC.A diesel engineD.A main switchboard48.A ground in an electrical