轮机英语真题46期,甲类三管轮

轮机英语全国统考试题(总第46期)

一、单项选择题

1. In order to control thermal stresses,some types of modern engines use pistons with .

A.heavy wall and intensive cooling

B.heavy wall and no cooling

C.thin wall and no cooling

D.thin wall and intensive cooling

2. The average pressure exerted on a piston during each power stroke is termed .

A.indicated horsepower

B.mean eff ective pressure

C.exhaust back pressure

https://www.sodocs.net/doc/3718858213.html,pression pressure.

3.The ignition quality of a diesel f uel is indicated by the

A.cetane number

B.volatility point

C.viscosity index

D.octane number

4.A piston in a f our-stroke/cycle diesel engine makes f our strokes during each

A.crankshaf t revolution

B.mechanical cycle of operation

C.period of two combustion cycles

D.cycle of two events

5.Crankshaf ts of medium speed engines are f rom a single piece of steel.

A.unusually solid welded

B.never be solid f orged

C.almost invariably solid f orged

D.almost invariably be welded

6.The start ing air entering the cylinder begins when the piston .

A.has nearly come to the TDC

B.has just past the TDC

C.has nearly come to the BDC

D.has just past the BDC

7.A main bearing consists of two shells which are secured by means of studs and .

A.tie rods

B.through bolts

C.lead wires

D.bearing caps

https://www.sodocs.net/doc/3718858213.html,pared to f our-stroke/cycle engines,two-stroke/cycle diesel engines have the disadvantage of.

A.less even torque

B.higher cylinder head temperatures

C.f ewer power strokes per revolution

D.greater weight/size requirements

9. controls the f uel oil temperature in order to provide oil at the correct viscosity f or combustion.

A.The viscosity regulator

B.The temperature controller

C.The f low meter

D.The pressure switch

10.In a diesel engine lube oil system,which of the f ollowing parts should be lubricated f irst?

A.Camshaf t bearings

B.Main bearings

C.Piston crowns

D.Cylinder walls

11.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

12.In a turbocharger , inlet air velocity is increased in the .

A.inlet nozzle ring

B.stationary dif f user passages

https://www.sodocs.net/doc/3718858213.html,pressor outlet volute

D.rotating impeller vanes

13.Each cylinder has one starting valve which is usually opened by air pressure and closed by

A.nuts nad bolts

B.new joints

C.spring f orce

D.sealing rings

14.In a simple mechanical governor, the

A.centri f ugal f orce rotates the ball-head

B.f lyweight centri f ugal f orce is balanced by spring f oce

C. f lyweight centri f ugal f orce is balanced by hydraulic pressure

D.speeder spring alone actuat es the f uel control rod

15. A pyrometer is an instrument commonly used to measure

A.cylinder pressure

B.f lame intensity

C.exhaust gas temperature

D.crankshaf t axial alignment

16.Af ter starting a diesel engine,which of the listed operating conditions should be checked f i rst?

A.Air box pressure

B.Lube oil pressure

C.Exhaust temperatures

D.Raw water pressure

17.A high temperature alarm or which will melt is used to guard against the explosion of compressor air pipelines. A.a f lame trap B. a relief valve

C.a f usible plug

D.a bursting cap

18. What preventative maintenance should be done frequently to diesel engine starting air receivers?

A.Drain the accumulated moisture.

B.Test the relief valves.

C.Watch the temperature to prevent f luctuations in pressure.

D.Clean the interior to remove oil and f oreign matter.

19.In reducing engine speed to and eff i cient propeller speed by the use of reduction gears,

A.speed and torque are both reduced

B.speed is reduced and torque remains unchanged

C.speed is reduced and torque is increased

D.speed is sometimes unchanged while torque is increased

20.Which of the f ollowing statements concerning f ire-bube boilers is correct?

https://www.sodocs.net/doc/3718858213.html,bustion gases f low through the tubes.

B.Flames impinge on the tubes.

https://www.sodocs.net/doc/3718858213.html,bustion occurs in the tubes.

D.Water f lows through the tubes.

21.The exhaust boilers are used to recover some of carried in the exhaust gas f rom the main engine .

A .water B.oil C.heat D.steam

22.The water level in a steaming auxiliary boiler will always .

A.rise when the steam pressure is increased

B.remain constant as long as the f eed pump operates

C.f all when the steam pressure is decreased

D.vary as the steam demand changes

23.When lighting of f an auxiliary boiler,which of the problems listed could cause the burners to sputter?

A.Cold f uel oil

B.Low f uel oil pressure

C.Low atomizing steam pressure

D.Water in the f uel oil

24.If the f eed pump f or and auxiliary boiler f ails to deliver the f eed water to the boiler,the cause may be

A.high steam pressure in the boiler

B.abnormally high f eed-water temperature

C.abnormally high boiler water temperature

D.steam demand exceeding feed pump capacity

25.Through a pump,the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.

A.positive displacement

B.ejector

C.centrif ugal

D.air compressor

26.Sealing lines provide sealing liquid f low to the stuf f ing box of a centri f ugal pump

A.to prevent seawater from passing out the stuff ing box when a high suction head is present

B.to cool the shaf t

C.in place of mechanical seals

D.in place of lantern rings

27.Which of the valves listed will be cycled from f ully open to f ully close when the handle is turned 90 degree?

A. A rising stem gate valve

B.A globe stop valve

C.A check valve

D. A butterf ly valve

28.Centrif ugal pumps,used to handle hot liquids, must have a minimum f low through them under all operating conditions.This f low serves to

A.prevent overheating and damage to pump rotating parts due to rubbing

B.maintain the net positive suction head of the pump

C.maintain hydraulic dif ferential in the pump impeller passages

D.purge the pump of non-condensable vapors and gases

29.If you heard a …crackling?noise in a centrif u gal pump, the most probable cause of the problem would be

A.insuff icient speed

B.cavitation

C.excess discharge pressure

D.excessive net positive suction head

30.In the process of,liquid changes into gas.

A.evaporation Bf rosting

C.condensing

https://www.sodocs.net/doc/3718858213.html,pressing

31.The device used f or low-pressure control and high-pressure cutout on a compressor is called a

A.cutout

B.pressure controller

C.controller switch

D.cutout switch

32.A purge recovery system is used in a central air conditioning or ref rigeration system to

A.purge lube oil f rom the liquid refrigerant

B.recover wat er purged f rom the system

C.separate f oul gases f rom the receiver

D.purge non-condensabl e gases without losing refrigerant

33.In an air conditioning system,low head pressure associat ed with a reciprocating compressor can be the result of

A.broken valve springs

B.tight drive belts

C.high line voltage

D.air in the system

34.When discharging bilge water over board, which criteria must be observed?

A.The requirement f or the oil content of bilge water discharged is under 15ppm

B.No discharge in sensitive waters

C.Any discharge in sensitive waters

D.International, national or local requirements have to be observed

35.The f ollowing measures can be used to improve oily water separator?s separating effect except

A.overhauling every two year

B.working at intervals

C.renewing f iltration material

D.properly heating

36.Disposal of all kinds of garbage but listed as below is prohibited within Special Areas.

https://www.sodocs.net/doc/3718858213.html,minuted or ground papers, rags, glass, metal etc

B.plastics

C.f ood waste comminuted or ground

D.Incinerator ash

37. When does auxiliary burner of incinerator put into operation?

I.start incinerator when it is cold II. Little waste oil f or dealing with III. plenty of waste oil f or dealing with IV the water and impurity in sludge are too much V the temperature in incinerator is low VI dealing with little solid rubbish

A.II+III+V

B. I+II+III+IV

C.I+IV+V+VI

D.I+II+III+VI

38.Bacteria which live are said to be aerobic.

A. in the presence of oxygen

B.without oxygen

C.in the presence of nutrition

D.without nutrition

39. When centri f uging heavy f uel oil, an important f actor to consider is(are) the .1)f low rate 2)viscosity of the

f uel oil

A. 1)

B.2)

C.both 1) and 2)

D.Neither 1)nor 2) are correct

40.To ensure lube oil purif ier working in normal condition, the interval between two sludge discharging should not exceed hours.

A. 2

B.4

C.5 D6

41. can not cause oil f low f rom wat er outlet of sel f cleaning purif i er.

A. Oil temperature too high

B.Diameter of gravity disc too large

C. Oil temperature too low

D.High level tank out of water

42. In the production of f reshwat er from seawater through a process of heating and cooling, the cooling phase of production is usually called

A.evaporation Bdistillation

C.dehydration

D.condensation

43.Distilled water f rom an evaporator may be discharged into a potable water tank

A. through a detachable hose connection

B.af ter passing through an activated charcoal f ilter

C.af ter chemical analysis shows it is f it f or consumption

D.through a solenoid operated three-way valve

44.What type of valve is used to direct the f low of hydraulic f luid?

A.relief valve

B.direction control valve

C.stop valver

D.pressure control valve

45.Cargo hand ling unit is rated according to the to be lif ted.

A. cargo crane

B.jib

C.saf e working load

D.oil pressure

46. The crane is usually mounted on a pedestal to effer adequate to the operator. A.time B.space

C.length

D.visibility

47.Proper internal lubrication of a hydraulic anchor windlass lef t idle f or extended penods can be accomplished by .

A.perf orming a chech run on the unit at regular intervals

B.testing the hydraulic f luid f or proper PH

C.checking the reservoir f or proper level

D.cleaning strainers at regular intervals

48. are used f or hauling in or letting out the wires which f asten the ship to the shore.

A.Cargo winches

B.Mooring winches

C.Windlasses

D.Cargo hatches

49. The major source of chemical contaminants in hydraulic f luid is .

A.microscopic steel shavings

B.abrasive waste

C.anti-oxidant compounds

D.oxidation by-products

50.If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow f or contraction to prevent .

A. f ailure of the hydraulic hose

B.excessive f low through the line

C.f riction in other areas of the hydraulic system

D.overheating of the hydraulic f luid

51.A cirucit that has one wire in contact with the hull of the ship is a

A.series circuit

B.grounded circuit

C.short circuit

D.closed circuit

52.The f requency of an alternator at a given r/min is determined by the .

A.number of turns of wi re in the armature coil

B.number of magnetic poles

C.strength of the magnets used

D.output voltage

53.The operation of paralleling two alternators requires the voltages to be and also in phase.

A.zero

B.eliminated

C.diff erent

D.equal

54.The f requency of an AC generator is controlled by the

A.rheostat

https://www.sodocs.net/doc/3718858213.html,ernor

C.exciter

D.capacitor

55.A motor enclosure which protects against falling liquids is classif ied as

A.water-proof

B.drip-proof

C.spray-tight

D.spray-proof

56. are supplied with electricity by main switchboard directly.

A.Suez Canal searchlight, air compressor and ai r conditioning compressor

B.Air compressor, boiler blower and ref rigeration plant

C. Boiler blower , Suez Canal searchlight and ref rigeration plant

D.Suez Canal searchlight and boiler blower

57. is not installed on the emergency switchboard.

A. Ammeter

B.V oltmeter

C.Wattmeter

D.Synchroscope

58.When two D.C.generators operate in parallel, they are protected against motorizing by

A.blow out coils

https://www.sodocs.net/doc/3718858213.html,ernor relay

C.under voltage trips

D.reverse current trips

59.Moisture in a D.C. motor would cause

A.short circuit

B.speed up

C.slow down

D.hunting

60.The part of a f use that melts and opens the circuit is made of

A.copper and antimony

B.steel and babbitt

C.aluminum or beryllium alloy

D.zinc or an alloy of tin and lead

61.The main purpose of an electric space heater installed in a large AC generator is to

A.prevent the windings f rom becoming brittle

B. prevent moisture f rom condensing in the windings during shutdown

C. prevent acidic pitting of the slip rings

D. keep the lube oil warm f or quick starting

62.Sparking at the brushes of a running motor could be an indication of

A.normal operation

B.a dirty commutator

C.increased brush capacity

D.water vapor absorption

63. Prior to starting ,the purpose of turning over a main propulsion diesel engine with the cylinder test cocks open, is to \

A. test the starting system

B. remove condensation from the cylinders

C.check the compression

D.check f or proper lube oil pressure

64. During the watch keeping at sea, should be logged or recorded in the engine log book.

A.the running hours of the cooling water pump

B.chief engineer?s order

C.the main parameters of main and auxiliary equipments.

D.the position of the vessel

65. During ship manoeuvering, when thd diesel is stopped, which of the f ollowing items is wrong?

A.keep all systems running normally

B. main engine is available at any moment

C.shut off the starting air bottle outlet valve

D.pay attention to the changes of the system parameters

66.Which of the listed conditions can be considered as the single greatest cause of accidents?

A.Speed

B.Excessive knowledge or skill

C.Human error

D.Excitement

67.On a tank vessel, which of the f ol lowing substances would be burning in a class “B”f ire?

A.Oil

B.Wood

C. Rags

D.Electrical wiring

68.The most likely place f or a f ire to start through the process of spontaneous combustion is in

A. an electrical switchboard

B.the pressure tanks

C.the f uel oil tanks

D.the oily rag bin

69.Which of the f ire extinguishers listed is to be weighed annually and sent ashore f or recharging if the weight loss exceeds 10% of the weight of a f ull charge?

A.Foam

B.Soda acid

C.Dry chemical

D.Carbon dioxide

70.While on watch in the engine room,you hear a continuous sounding of the general alarm.Which of the f ollowing actions should you take f irst?

A. Secure the burners then proceed to your assigned boart station.

B.Start the f ire pump and establish f low to the f ire main.

C.Open the guardian valve and standby to maneuver.

D.Open the master control valves on the f ixed CO2 system.

71.If there were a f ire in the bunker tanks, you should

A.close the vent

B.pump out the tank

C.activate the f ixed CO2 system

D.cut off the heating coils

72.To avoid excessive surge pressure when bunkering , you should

A.bunker at a normal rate

B.check f or kinks in hose

C.close valves slowly

D.shut valves bef ore topping off

73. ,where minor repairs are carri ed out with a ship in sevice,of ten during a stay in prot. This may be remote from a ship repair site.

A.V oyage repairs

B.Routine docking

C.Daage repairs

D.Conversion

74. When is the dock survey carried out ?

A.During annual repair

https://www.sodocs.net/doc/3718858213.html,ually during dock repair

C.Bef ore sea trial

D.Af ter 5 years f rom last annual survey

75.In the initial survey, compiles the survey report and f ills in certif icat e.

A.surveyor

B.chief engineer

C.administrator

https://www.sodocs.net/doc/3718858213.html,pany superintendent 76.If an incorrect entry were made in the Oil Record Book, you should

A.erase the entry and rewrite it

B.notif y the ship?s off icer-in-charge

https://www.sodocs.net/doc/3718858213.html,pletely black it out and make the correct entry alongside

D.draw a single line through the wrong entry and initial it.

77.The International Oil Pollution Prevention Certif icate is valid f or a period of

A.one year f rom the date of issue

B.f ive years from the date of issue

C.three years f rom the date of issue

D.f our years f rom the date of issue

78. Which one is Not the …clear grounds?f or a more detailed inspection?

A. no operation procedures f or the oil separators

B.engine log book missing

C.the master and the chief engineer are unabl e to communicate effectively

D.absence of an up-date muster list

79. The Port State Control off icer may witness a f ire drill carried out by the crew assigned to these duties on the

A.Navigation Log Book

B.Engine Room Log Book

C.Oil Record Book

D.Muster List

80.STCW 78/95 Convention shall apply to seaf arers on board seagoing ships entitled to f ly the f lag of a Party.

A. served

B.serving

C.surveyed

D.surveying

81.The main purpose of port State control is not to

A.prevent an unsaf e ship proceeding to sea

B.prevent a ship threatening the marine environment

C.f ine the ships

D.conf irm a saf e sailing

82.The bridge should inf orm the engine room bef ore passing through congested or shallow waterway.

A.24 hours

B.2 hours

C.1 hour

D.15 minutes

83.When the chief engineer is in the machinery spaces,the officer in charge of the engineering watch shall

A.continue to be responsible f or machinery space operations despite the presence of the C/E

B. hand over the responsibility to the chief engineer actively

C. be responsible f or the watching together with the chief engineer.

D.assistant the chief engineer to contol the machinery.

84.According to the international regulations concerning the prevention of pollution of sea areas f rom ships, the disposal into the sea of all plastics is

A.welcome

B.admitted in some special sea areas

C.prohibited

D.acceptable

85.The ship emergency plan item does not include usually.

I lif esaving, f ire f ighting II f irst aid III abandon ship

A. II

B.III

C.II III

D.I

86. Under ISM Code, the ship to which it applies has to carry

A. an International Ship Security Certif icat e

B. an International Oil Pollution Prevention Cerif icat

C.a Saf ety Managem ent Certif icate

D. an International Ballast Water Management Certif icate

87. The objective of ISPS Code is

A. to protect the marine environment

B. to provide a method to avoid an accident

C. to protect the ship f rom collision

D. to keep terrorism action away f rom ships.

88. According to “MARI TIME LABOUR CONVENTION,2006”,The maximum hours of work shall not exceed

A.14 hours in any 24-hour period

B. 72 hours in any seven-day period

C.10 hours in any 24-hour period

D.88 hours in any seven-day period

二、关联题（关联题题干下有4个小题，每小题4个选项）第一组

Port State Control(PSC) is the inspection of f oreign ships in national ports f or the purpose of veri f ying that the condition of the ship and its equipment comply with the requirements of international conventions and that the ship is manned and operated in compliance with applicable international laws.

The primary responsibility f or ensuring that a ship maintains a standard at least equivalent to that secif ied in internaitonal conventions rests with the f lag State and if all f lag States perf ormed their duties satisf actorily there would be no need f or port State control. Unf ortunately this is not the case as evidenced by the many marine accidents around the world-hence the need f or additional control.

The authority f or exercising PSC is the national law based on relevant conventions. It is theref ore necessary f or a port State to be Party to those conventions and to have promulgated the necessary legislation bef ore exercising PSC. In accordance with the provisions of the applicable conventions,Parties may conduct inspections of f oreign ships in their ports Port State Control Off icers(PSCOs).

89.The purpose of PSC is

1) to check and inspect f oreign ships 2) to verif y the condition of a ship in compliance with requirements o f international conventions;

3)to make sure that the ship is manned and operated well 4)to detain ships

A 1)2) B.2)3) C.1)3) D.1234

90.Who will be responsible f or ensuring that a ship maintains a standard at least equivalent to that specif i ed in international conventions?

A.PSCOs

B.Ship owners

C.Flag states

D.Port states

91.Bef ore exercising PSC,a port state should

A.become a contracting Party and promulgate regulations f or implementing PSC

B.inf orm ship owners

C.establish procedures

D.inf orm shipping companies

92. PSC inspection is implemented by through

A. f lag states/PSCOs

B.f lag states/ship owners

C.port states/PSCOs

D.port states/ship owners

第二组

Almost all f ailures in the f uel oil system,including the compression being to low,result in the crankshaf t rotating more slowly if there is a f ailure at one or more cylinders simultaneously. If only one or two cylinders fail, and the engine is not f ully loaded, the crankshaf t rev/min does not decrease, the reason being that the governor ensures that the remaining cylinders are loaded to a correspondingly great er extent. If the engine is already f ully loaded, the cylinders that are working normally become overloaded causing a smoking exhaust and higher exhaust temperatures etc. The load must always be reduced until the f ailure has been located and recti f ied. The reasons f or a cylinder suddenly working at reduced load, or failing completely, may be :

1. a def ective or blocked f uel injection valve.

2.the f uel oi l pump piston seizing in the barrel. This f ailure can be ascertained by trying to move the pump?s toothed rack.Defective f uel pumps must be changed.

3.the compression being to low because of sticking , worn or broken piston rings.

4 leaking inlet or exhaust valves

5. no clearance in the valve operation gear.

The reasons f or the crankshaf t rotating more slowly, or stopping completely,can also be:

1. the f uel oil f ilter being blocked. This f ailure is identif ied by decreasing oil pressure af t er the f uel oil f ilter.

2.valve sticking in the open position

3.leaking f uel oil pipes or joints.

4.water in the f uel oil

5.the regulating mechanism being jammed

6.the governor not f uncitoning correctly.

7the electrical shutdown valve(the monitoring system)being activated.

93.This passage is mainly about

A.the f ailure of reduced rpm.

B.the f ailure of the governor

C.how to ensure the constant rotational speed

D.the reasons f or the f uel system to shut down

94.If one or two cylinders fail in f uel oil system the crankshaf t rev/min .

1)will invaviably decrease 2)does not decrease 3)will decrease under certain circumstances

A.1

B.2

C.3

D.None of 1 2 3is true

95. Which of the f ollowing is NOT mentioned as the reason f or a cylinder suddenly working at reduced load?

A.f uel valve f ailure

B.f ailure of f uel pump discharge valves

C.too large gaps of piston rings

D.the f uel oil f ilter being blocked completely

96.Which of the f ollowing is NO T mentioned as the reason f or the crankshaf t rotating more slowly or stopping?

A.changing f rom heavy oil to light diesel oil

B.connections leaking

C.there being too much water

D.malf unction of the governor 46轮机英语的答案

1- 5 DBABC 6-10 BDBAB

11-15 CDCBC 16-20 BCACA 21-25 CDDBA 26-30 BDABA 31-35 BDADA 36-40 BCACB 41-45 DDDBC 46-50 DABDA 51-55 BBDBA 56-60 DDDAD 61-65 BBBCC 66-70 CADDB 71-74 ACABA 76-80 DBADB 81-87 CCAC ACD 88-AB 89-92 ~~~~ 93-96~~~~

第47期轮机英语

47期轮机英语考试题目 一单项选择题 A1.The___ engine is used for alternators and some times for main propulsion provide a propeller of between 90 to 120 rpm. A.four-stroke B.two-stroke. C.slow speed D.reversible B2.The abbreviation”MIP”stands for____, A.middle indicating pressure B.mean indicated pressure C.mean pitch D.middle indicated power D3.The cetane number of a diesel fuel oil indicates its____. A.viscosity B.acid content C.heating value D.ignition quality C4.In a two-stroke engine the camshaft rotates at___the enging rotational speed. A.half B.twice C.the same speed as D.four times D5.A diesel enging is similar to a gasoline engine except that the former has no ____. A.cross-head B.cylinder C.connecting rod D.spark plug C6.It is easier to replace a dry cylinder liner than a wet one because____. A.of the thin wall thickedss B.honing makes it easier to maintain the desired oil film C.water seals are not required D.it fits more loosely due to a decrease in heat transfer through the composite wall D7.A main bearing consists of two shells which are secured by means of studs and____. A.tie rods B.though bolts C.lead wires D.bearing caps C8.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 exchange C.chemical reaction D.coalescence A9.During the fuel injection period,fuel pressure must exceed cylinder gas pressure to____. A.ensure penetration and distribution of the fuel in the combustion chamber B.ensure the needle valves is flushed clean duringeach injection C.prevent combustion gas blowback into the open needle valve Dprevent reflected 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 through 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 tank

轮机大管轮英语真题48期

中华人民共和国海事局 2009年第5期海船船员适任证书全国统考试题(总第48期) 科目：轮机英语试卷代号：803 适用对象：无限、近洋航区3000KW及以上船舶大管轮 （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82题，每题1分，第83题至94题，每题1.5分。 一、单项选择题： 1. The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is . A. they operate between 150 and 450 rpm B. they are connected to the propeller by gearing C. their smaller size and weight D. they can be connected directly to the propeller without gearing 2. 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 springs B. compressed air pressure C. hydraulic pressure D. exhaust gas pressure 3. One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the . A. governor sensitivity B. exhaust temperature C. fuel injection pressure D. speed of the cam shaft 4. The desirable properties or a marine fuel oil should inc lude . A. high flash point and high viscosity B. low flash point and high viscosity C. low heating value and high sulphur content D. high heating value and low sulphur content 5. As the plunger moves upwards in the barrel, injection will commence once the plunger bas the spill ports and the pressure builds up. A. opened up B. closed off C. lined up D. taken off 6. In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces . A. all of the oil used by the engine through a filter B. some of the oil used by the engine through a filter C. some of the oil used by the engine through a centrifuge D. all of the oil used by the engine through a centrifuge 7. Because the circulating water is in a closed loop, is installed to cater for expansion and contraction of the water at different conditions of operation. A. an expansion joint B. a drain tank C. a head tank D. a contraction tank 8. The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the . A. inlet nozzle ring B. turbine wheel blade C. diffuser passages D. inlet volute 9. is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve. A. An air receiver B. An operating valve C. An automatic valve D. An air distributor 10. Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as . A. actuation B. sensitivity C. compensation D. promptness 11. By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a . A. tachometer B. pyrometer C. dynamometer D. calorimeter 12. When the ship is going to enter into the harbor, ____. A. change from heavy fuel oil to diesel oil for main engine B. pumping out bilge water C. change sea chest from high level one to lower level one D. test emergency generator 13. If the jacket water temperature rises rapidly above normal in a diesel engine, you should first . A. place standby cooler in operation B. reduce engine toad C. check thermostatic valve D. clean sea water strainer 14. Air cocks, usually positioned at the in a circulating system, is used to get rid of the air in the system. A. bending joint B. expansion tank C. weld D. the highest point 15. Which of the following conditions could contribute to the cracking of a diesel engine cylinder head? A. Leaking seal ring B. Insufficient heat transfer from the exhaust valves C. Blocked cooling water passages to the head D. Excessive scavenging air provided to the engine 16. of an engine crankshaft can be detected by measuring deflections of' crank webs for each unit of the engine. A. Misalignment B. Length C. Strength D. Stresses 17. can be a direct cause of faulty operation of diesel engine fuel injection nozzles. A. Excessive fuel nozzle holder cooling B. Sediment in the fuel supply C. Distortion of the fuel spray pattern D. Improper atomization of the fuel 18. When fuel is injected late into a diesel engine cylinder . A. the exhaust will be clear B. fuel consumption will be low C. all the fuel will be burned at top dead center D. fuel consumption will be high 19. A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result m the need to adjust the . A. pilot valve opening B. compensating needle valve C. compensating spring tension D. accumulator spring tension 20. Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system? A. Baffle plates that have been bent during prior removal. B. Leaks m the cooler tube nest. C. Operating the engine while maintaining a high sea water outlet temperature. D. A punctured sea water strainer supplying cooling water to the heat exchanger. 21. If the scavenge fire is of a more major nature, if there is a risk of the fire extending or if the scavenge trunk is adjacent to the crankcase with risk of a hot spot developing it sometimes becomes necessary to the engine. A. stop B. start C. speed up D. slow down 22. In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?

大学英语3级考试真题

大学英语 3 级考试真题 一、听力测试(本大题满分25 分，每小题 1 分 ) 做题时，先将答案划在试卷上。录音内容结束后再将试卷上的答案转涂到答题卡上。 第一节 听下面的 8 段短对话。每段对话后有一个小题，从每小题 A 、B 、 C 三个选项中选出一个最佳答案。 听每段对话只读一遍。 1.What color skirt does Linda like？ A. Red. B. Green. C. Blue. 2. How is the weather now? A. Sunny. B. Cloudy. C. Rainy. 3. How did they spend their weekend? A. They had a school trip. B. They cleaned up the street. C. They studied for a test. 4. Where will Peter go on vacation? A. To Canada. B. To Australia. C. To Japan. 5. What does Mike’ s father want him to be? A. A soldier. B. A pilot. C. A doctor. 6. Who will repair the bicycle? A. Bill's brother. B. Mrs. Brown's brother. C. Bill. 7. How much is the jacket now? A. 60 dollars. B. 90 dollars. C. 120 dollars. 8. What do we know about Jenny from the conversation? A. She is worried about a coming test. B. She is working hard at physics. C. She didn't pass the recent test. 第二节 下面你将听到 5 段对话或独白。每段对话或独白后有几个小题，从每小题A、B、C 三个选项中，选出一个与你听到的对话或独白内容相符的问题的答案。对话或独白读两遍。 听第一段材料回答 9 至 11 小题。 9. How many people will sit at the table? Xk b https://www.sodocs.net/doc/3718858213.html, A. Two. B. Three. C. Four. 10. What is the restaurant famous for? A. Noodles. B. Chicken soup. C. Dumplings. 11. What would they like to drink? A. Fish soup. B. Beer and coke. C. Milk. 听第二段材料回答第12 至 14 小题。 12. Have the speaker ever seen each other? A. Yes, they have. B. No, they haven't. C. We don't know. 13. How often does Lucy play tennis? A. Twice a week. B. Every morning. C. Never. 14. When may they meet again? A. Next morning. B. Next weekend. C. Next weekday. 听第三段材料回答第15 至 17 小题。 15. What's the relationship ( 关系 ) between the two speakers? A. Friends. B. Teacher and student. C. Father and daughter

三管轮轮机英语大证考试真题41期

中华人民共和国海事局 2006年第3期海船船员适任证书全国统考试题(总第41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. A diesel engine is similar to a gasoline engine except that the former has no ______. A. cross-head B. spark plug C. connecting rod D. cylinder 2. A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a ______. A. slow-speed diesel B. medium-speed diesel C. high-speed diesel D. constant-speed diesel 3.Which of the diesel engine components listed increases air density and helps to improve engine operating efficiency? A. Impeller B. Compressor C. After-cooler D. Exhaust diffuser 4.For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four- stroke/cycle diesel engine because ______. A. it has a longer power stroke B. more air gets into the cylinder each stroke C. it develops twice as many power strokes at the same speed D. higher combustion pressure is developed 5.The intake valves in a diesel engine are reseated by ______. A. cam followers B. push rods C. combustion gases D. valve springs 6.According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and ______. A. the pulse-phase system B. the pulse Doppler system C. the pulse system D. the pulse interval system 7.An over-speed safety device is usually fitted to a generator engine for______in the event of over- speed. A. cutting power off the engine B. increasing the fuel pump setting C. braking the crankshaft D. stabilizing the ship speed 8.What preventative maintenance should be done frequently to diesel engine starting air receivers? A. Drain the accumulated moisture. B. Test the relief valves. C. Watch the temperature to prevent fluctuations in pressure. D. Clean the interior to remove oil and foreign matter. 9.Immediately after any diesel engine is started, the engineer should check the ______. A. crankcase pressure B. lube oil pressure C. seawater pressure D. exhaust temperature 10. A controllable pitch propeller on a diesel driven vessel eliminates the need for ______. A. friction clutches B. disconnect clutches C. reversing gears D. reduction gears 11.In motor ship, ______is often used to recover some of the heat carried in the exhaust gases from the main engine. A. an diesel oil heater B. a waste heat boiler C. a fresh water generator D. a donkey boiler 12.An exhaust gas bypass is installed on a waste heat boiler in order to ______. A. bypass exhaust gas at high loads to prevent excessive back pressure B. bypass a portion of the exhaust gas at peak loads for better efficiency C. recycle exhaust gas to the turbocharger D. minimize moisture condensation in the boiler gas passages at low loads 13.Prior to lighting off a cold automatically fired auxiliary boiler, you should ______. A. check and regulate the water level B. close the air cock once fires are lit C. blow down the gage glass D. assure protective steam flow 14.Flame failure in an automatically fired auxiliary boiler can mostly result from a/an ______. A. incorrect electrode setting B. incorrect nozzle position C. clogged fuel nozzle D. broken high tension lead 15.Waterside scale in a fire-tube boiler may cause ______. A. increased heat transfer B. fireside erosion C. high steam demand D. overheated tubes 16.Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? I. Its discharge is continuous; II. It has no internal valves; III. Upon accidental closing of discharge valve, excessive pressure will not build up A. I, II B. II, III C. I, II, III D. II only 17.Why are removable sleeves installed on centrifugal pump shafts? A. They make it easier to replace the pump shaft packing. B. They can be economically replaced as they wear out. C. They can be removed when it is necessary to lighten the weight of the pump. D. They increase the strength of the shaft. 18.If one of the bilge system manifold valves does not properly seat, the ______. A. bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied B. bilge system will lose vacuum and prevent the other bilges from being pumped out C. bilge well aft connected to that valve will siphon(虹吸) its contents to the forward bilge wells D. discharge pressure will be too high. 19.Which of the listed statements is correct concerning the starting of centrifugal pumps? A. They should always be started with the discharge valve closed. B. They should always be started with the discharge valve opened. C. A priming pump is always required to flood the impeller suction. D. They should always be started with the sealing line valves closed. 20.The simplest method to use for determining if a centrifugal pump is operating as designed, is to ______. A. closely observe the pump discharge temperature B. close off the discharge valve, and watch for a rise in pressure C. momentarily close off the suction valve, and watch for a rise in pressure D. use a clamp on ammeter and compare the readings to past records

轮机英语历年真题43期

中华人民共和国海事局 2007年第2期海船船员适任证书全国统考试题(总第43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 engines, the diesel engine is ______ used engine on board. A. Between/more commonly B. Among/the most commonly C. Between/not more commonly D. Among/ not the most commonly 2.The average pressure exerted on a piston during each power stroke is termed ______. A. indicated horsepower B. mean effective pressure C. exhaust back pressure D. compression pressure 3.The cetane number rates fuels for diesel engines according to its ______. A. antiknock characteristics B. ignition qualities C. rates of vaporization D. viscosity 4.The time between injection and ignition of the fuel is known as ______. A. turbulence lag B. after burning ratio C. pre-ignition lag D. ignition delay 5.______ controls the fuel oil temperature in order to provide oil at the correct viscosity for combustion. A. The viscosity regulator B. The temperature controller C. The flow meter D. The pressure switch 6.Constant cooling the various components of diesel engine has a number of functions except for ______. A. good lubrication B. low thermal stress C. good mechanical properties D. acid corrosion 7. A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an ______. A. torque limiter B. over-speed trip C. over-speed governor D. load limit governor 8.Engine speeds at which resonance can occur are termed ______. A. maximum speeds B. full speeds C. sea speeds D. critical speeds 9.Prolonged operation of a diesel engine with a closed cooling water system at lower than normal designed operating temperatures can ______. A. increase power output B. decrease lube oil viscosity C. eliminate fuel knock D. cause sulfuric acid formation 10.______ on a ship transmits power from the engine to the propeller. A. The automatic control system B. The speed regularly system C. The transmission system D. The compression air system 11.In a _____ boiler the hot gases from the furnace pass through the tubes while the water is on the outside. A. water-tube B. fire-tube C. exhaust gas D. composite 12.The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ______. A.salinity is abnormally B.high steam demand is too high C.feed-water flow is low D.water level is abnormally low 13.The water in a steaming auxiliary boiler should be tested daily for ______. A. dissolved oxygen B. chlorides C. sludge D. dissolved nitrogen 14.Ignition failure in an automatically controlled auxiliary boiler could be caused by ______. A. carbon deposits on the flame scanner B. high fuel oil temperature C. low fuel oil viscosity D. high steam pressure 15.The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ______. A. seawater contamination B. frequent surface blows C. dissolved oxygen de-aeration D. frequent bottom blows

2016年度大学英语三级考试精选题

2016年大学英语三级考试真题-英语三级考试A级及答案 Part II Structure (15 minutes) 第二部分结构（15分钟） Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections. 方向：这部分是测试你的语法正确的句子的能力建设。它由2个部分组成。 Section A 第1课时 Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A), B), C) and D). Then you should mark the corresponding letter on the Answer Sheet with a single line through the center. 方向：在这一节，有10个不完整的句子。您需要完成每一个决定的最适当的词或词的4个选择标记为A，B），C和D）。这个你应该在答题纸上用中间一行标出相应的字母。 16. We must find a way to cut prices ________ reducing our profits too much. A) without B) despite C) with D) for 16。我们必须找到一个方法来降低价格________减少我们的利润太多。 a)没有b）尽管c）与d） 17. She didn’t know ________ to express her ideas in English clearly in public. A) which B) why C) what D) how 17。她不知道________表达自己的想法用英语清楚的公共。A）B）为什么C）什么D）如何 18. ________ the weather improves, we will suffer a huge loss in the tourist industry. A) As B) Since C) While D) Unless 18。________天气好转，我们会在旅游业的巨大损失。a）作为b）由于c）d，除非 19. We are happy at the good news ________ Mr. Black has been awarded the Best Manager. A) that B) which C) what D) whether 19。我们很高兴听到这个好消息，________布莱克先生被授予“最佳经理。A），B），C）D）是什么 20. It is important that we ________ the task ahead of time. A) will fish B) finished