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轮机英语大证考试真题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

16.Some pumps use packing as sealing gland. The gland should be ______.

A. slack enough to allow slight leakage of fluid

B. slightly chocked

C. brought up tight so as not to allow any leakage

D. fitted with a relief valve

17. A spur gear pump should be operated with the discharge valves ______.

A. slightly opened

B. throttled

C. fully opened

D. halfway opened

https://www.sodocs.net/doc/0317592701.html,pared to globe and angle valves, gate valves ______.

A. are more suitable for throttling

B. operate with little or no pressure drop when fully opened

C. are more easily repaired

D. cannot be used for service requiring infrequent operation

19.An increase in rotor clearances in a rotary pump will ______.

A. increase discharge pressure

B. decrease pump capacity

C. decrease pump cavitation

D. decrease reaction ring clearance

20.The usual symptoms of cavitation in a centrifugal pump is ______.

A. noise and vibration

B. an increase in discharge pressure

C. an increase in suction pressure

D. lifting of the relief valve

21.Refrigerant entering the compressor of a refrigeration system should be in which

of the following conditions?

A. Sub-cooled liquid

B. Sub-cooled vapor

C. Superheated vapor

D. Liquid

22.______is the circulation and refreshing of the air in a space without necessarily a

change of temperature.

A. Refrigeration

B. Air conditioning

C. Ventilation

D. Heating

23.In an air conditioning system, moisture is removed from the air by ______.

A. filter

B. separators

C. ducted traps

D. dehumidifiers

24.Sludge may be formed in the oil in the crankcase of a reciprocating air

conditioning compressor as a result of ______.

A. refrigerant bubbles in the lube oil

B. refrigerant reducing the lube oil viscosity

C. oxidation of the lube oil from overheating

D. reducing the floc or cloud point of the oil

25. A high rate of separation between oil and water is favored by ______.

A. large size of oil globule

B. low temperature

C. high viscosity

D. high flow rate

26.When started, a complete oily water separating unit is first filled ______. The

oily water mixture is then pumped through the inlet pipe into the coarse

separating compartment.

A. with dirty water

B. with clean water

C. by oily water

D. by mixed water

27.Which is the pollution prevention equipment?

A. booster pump

B. evaporator

C. incinerator

D. cooler

28.The ____is used to burn oil sludge.

A. clarifier

B. oily water separator

C. incinerator

D. distiller

29.Oil water separators are used to ensure that ships don't discharge oil when

pumping out _____.

A. ballast water

B. boiler water

C. bilge water

D. sewage water

30.When a clarifier is running the impurities and water collect at the bowl ______.

A. center

B. periphery

C. inlet

D. upper parts

31.The separation of impurities and water from ______ is essential for good

combustion of diesel engines.

A. lube oil

B. fuel oil

C. turbine oil

D. grease

32.Brine density in a distilling plant is measured with a/an ______.

A. psychrometer

B. salinometer

C. anemometer

D. sphygmomanometer

33.The designed ______ is 20 tons per day, but the fresh water generator can only

distil 15 tons at present.

A. displacement

B. weight

C. power

D. capacity

34.______ play a very important part in hydraulic systems by preventing interaction

between different parts of the hydraulic circuit.

A. Motors

B. Check valves

C. Safety valves

D. Reducing valves

35.In a radial piston pump, reversal and control of fluid flow are accomplished by

moving the ______.

A. central valve

B. radial plunger

C. floating ring

D. cylinder body

36.In a ordinary cargo crane, ______is fitted to rotate the crane.

A. the slewing motor

B. the luffing motor

C. the hoisting motor

D. the fan motor

37.Which problems can occur if the brake band lining of a wildcat brake becomes

excessively worn?

A. The driving engine will over-speed.

B. The anchor will immediately drop.

C. The clutch will overheat.

D. The brake's effectiveness will be reduced.

38.______ are used for hauling in or letting out the wires which fasten the ship to

the shore.

A. Cargo winches

B. Mooring winches

C. Windlasses

D. Cargo hatches

39.Which of the following can be used in hydraulic transmission system?

A. Hydraulic oil

B. Animal oil

C. Light oil

D. Fuel oil

40.One factor that determines the frequency of an alternator is the ______.

A. number of turns of wire in the armature coil

B. number of magnetic poles

C. strength of the magnets used

D. output voltage

41. A DC generator is used to supply direct current in order to maintain an AC

generator field and is known as a/an ______.

A. rotor

B. stator

C. exciter

D. armature

42.When paralleling two AC generators, the frequency of the machine coming on-

line, immediately prior to closing its breaker, should be ______.

A. slightly less than the oncoming generator frequency

B. the same as the bus frequency

C. slightly greater than the bus frequency

D. the same as the bus voltage

43.When securing an AC generator, you should FIRST ______.

A. open the generator circuit breaker

B. switch the voltage regulator to 'manual'

C. decrease the field excitation to minimum

D. reduce the load on the unit

44. A generator is prevented from becoming motorized by the use of a/an ______.

A. over-speed trip

B. reverse power relay

C. back pressure trip

D. governor controls

45.The part of the shipboard electrical system used to control the distribution of

power to the branch circuits is the ______.

A. bridge control panel

B. disconnect links

C. governor relay box

D. main switchboard

46.Which of the listed sections of an emergency switchboard is used to supply

power for alarm signals under emergency conditions?

A. The generator and bus transfer section

B. The 450 volt, 60 cycle, 3 phase bus

C. The 120 volt, 3 phase, 60 cycle bus

D. The 24 volt DC bus

47.The separate supplies are connected in either star or delta formation. The star

formation is most commonly used and requires ______ slip-rings on the

alternator.

A. two

B. three

C. four

D. five

48. A fuse that blows often should be replaced only with a fuse of ______.

A. the recommended current and voltage rating

B. higher current and voltage rating

C. higher current and lower voltage rating

D. lower current and higher voltage rating

49.The overcurrent relay______ the motor contactor when the motor exceeds its

rated current .

A. connects

B. trips

C. fouls

D. destructs

50.Electric circuits are protected against overloads and short circuits by means of

a/an ______.

A. circuit breaker

B. amplifier

C. diode

D. capacitor

51.Prior to starting an AC generator prime mover, the voltage regulator cutout

switch should be placed in the _________.

A. manual position

B. bus neutral position

C. raise voltage position

D. transfer position

52.Before M/E putting on the starting air, the reversing and control gear should be

_____.

A. operated

B. stopped

C. checked

D. removed

53.______ is a precaution which contributes to avoiding trouble under normal

operating conditions.

A. Constant inspection

B. Keeping constant load

C. Remaining constant temperature

D. Varying speed

54.After “F.W.E.” is given, the air system is shut down, the _____ gear put in, all

drains and indicator cocks opened, and the cooling water kept running.

A. steering

B. timing

C. turning

D. running

55.Which of the following must be eliminated to prevent accidents?

A. Unsafe actions

B. Orderliness

C. Frequent inspections

D. Good work habit/practices

56. A class …C?fire would most likely occur in the ______.

A. engine room bilges

B. main switchboard

C. paint locker

D. rag bin

57.The most likely place for a fire to start through the process of spontaneous

combustion is in _____.

A. an electrical switchboard

B. the pressure tanks

C. the fuel oil tanks

D. the oily rag bin

58.While on watch in the engine room, you hear a continuous sounding of the

general alarm. Which of the following actions should you take FIRST?

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

B. Start the fire pump and establish flow to the fire main.

C. Open the guardian valve and standby to maneuver.

D. Open the master control valves on the fixed CO2 system.

59. A fireman's outfit carried onboard cargo vessels, must have a ______.

A. canister-type gas mask

B. fresh-air breathing apparatus

C. self-contained breathing apparatus

D. combustible gas indicator

60.The safe rate of bunkering heavy fuel oil is directly related to the ______.

A. type of fuel transfer pump aboard

B. temperature of the fuel oil being received

C. size of the fuel storage tanks ashore

D. distance from the fuel oil storage tanks ashore

61.To anneal a copper gasket, you should heat the gasket ______.

A. and quench it in oil

B. cherry red and quench in water

C. and let it cool slowly in the air

D. and carbonize it

62.Preventive maintenance _____.

A. should not be carried out during the watches.

B. can only be carried out in port.

C. is a kind of maintenances carried out prior to the occurrence

D. is a kind of maintenances carried out after the occurrence

63.The additional mark _____ in the Classification Certificate for Machinery

represents that personnel are watching at engine assembly control station and

monitoring all machinery and electronic devices.

A. BRC

B. MCC

C. AUT-0

D. AUT-1

64.Which of the following machinery space operations is required to be logged in

the Oil Record Book?

A. Ballasting or cleaning of fuel oil tanks.

B. Shifting suction of main fuel pump to reserve fuel oil tank.

C. Changing out sprayer plates to adjust for steam demand.

D. Daily inspection of engine room bilges.

65.The Port Authorities, in accordance with the IMO resolutions have been carrying

out _____ to enhance safety of ships.

A. CPP

B. FPP

C. PSC

D. FSC

66.The fire drill must, as far as practicable, be conducted as if _____.

A. there is a minor emergency

B. there is an actual emergency

C. there were a minor emergency

D. there were an actual emergency

67.Duties shall be so organized by the chief engineer that the first watch at the

commencement of a voyage and the subsequent relieving watches are _____and otherwise fit for duty.

A. well trained

B. in good luck

C. in good health

D. sufficiently rested

68._____ should not undertake any task which will interfere with the supervision

duties relating to the main machinery and associated equipment.

A. The watch keeping personnel

B. The chief engineer

C. The person on a bunker barge

D. The duty deck officer

69.At an unsheltered anchorage the chief engineer officer shall consult with _____

whether or not to maintain an underway watch.

A. the engineer officer in charge of watch

B. the deck officer in charge of watch

C. the master

D. the chief mate

70.The term 'oil', as used in the Pollution Prevention Regulations , means ______.

A. fuel oil only

B. crude oil only

C. liquefied petroleum gas

D. petroleum oil of any kind

71.In the event of a small bunker oil spill on deck occurring while bunkering, you

should ______.

A. wash down the area immediately with a fire hose

B. wash down the area with kerosene

C. cover the area with absorbent material

D. cover the area with foam

72.The SOLAS Convention in its successive forms is generally regarded as the most

important of all international treaties concerning the ______ of merchant ships.

A. pollution

B. economization

C. safety

D. efficiency

73.The SMS should provide for specific measures aimed at promoting the_____ of

equipment or systems the sudden operational failure of which may result in

hazardous situations.

A. visibility

B. ability

C. reliability

D. capability

74.Each ship shall carry on board a ship security plan approved by_____.

A. the chief engineer officer

B. the master of the ship

C. the manager of the company

D. the Administration

二、关联题（关联题题干下有4个小题，每小题4个选项）

The cooling water in the HT(high temperature) circuit cools the cylinder liners,

cylinder heads and turbocharger. From the pump water is supplied to the engine

manifold which is cast in the engine block. From the manifold the water is distributed to all cylinder liner sections and from each liner upwards through the cooling water channels in the liner collars. From the liner collars further into the cylinder heads. In the cylinder head the water is forced by an intermediate deck to flow along the flame plate, around the valves to the exhaust valve seats and up along the fuel injector sleeve.

From the cylinder head the water is discharged via a connection piece into the

discharge manifold.

The return water from the cylinder heads and turbocharger is supplied to the HT air cooler.

In the first stage of this cooler, most of the heat from the charge air is extracted. The LT circuit water cools the charge air in the second stage. The necessary cooling for the LT water is gained from a central cooler. By controlling the LT water temperature to the inter-cooler the correct charge air temperature can be obtained.

For preheating purposes, a heater circuit with a pump and heater are connected in the HT circuit before the engine. Before starting, the HT circuit is heated till about 60℃by a separate heater The pre-heating of the engine is, prior of starting up and loading on HFO, of utmost importance.

75. From the passage we know that the charge air temperature was controlled by ____.

A. sea water from a central cooler

B. fresh water from a central cooler

C. fresh water from a HT circuit

D. fresh water from the LT circuit

76. The cooling water to cool the engine was forced ______ .

A. into the cylinder block and then upwards into the cylinder head

B. into the cylinder intermediate section and then upwards into the cylinder head

C. into the cylinder head and then downwards into the cylinder block

D. into the cylinder ends and then further into the cylinder intermediate

77. After the charge air is discharged into the HT air cooler, _______.

A. the charge air temperature will become higher

B. the charge air temperature will become lower

C. the HT water temperature will remain constant

D. the HT water temperature will become lower

78. Which of the following devices may be used to warm the engine prior to starting?

A. A high temperature cooling water system.

B. A low temperature cooling water system.

C. A central cooler.

D. The second stage cooler.

三、中译英（共2题，请将答案写在答题纸上）

79．(轮机日志)检查所有燃油、滑油及冷却水工作液位，所有燃油柜放残。80．为了使设备能正常运转，我们必须按时仔细地做好维修保养工作。

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?

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

轮机英语试题二十三

试题二十三一、单项选择题： 1.Because the castings of smaller engines are not so big and heavy, ______ and cylinder block may be made in one piece. A. the column B. the jacket C. cylinder cover D. cylinder liner 2.______ 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 3. A common trouble with the fuel pump plungers or fuel valve spindle is______. A. broken down B. stuck C. oil leakage D. carbonized 4.Diesel fuel oil having a low cetane rating can result in ______. A. improved cold weather starting B. smoother engine operation C. combustion knock D. reduce ignition lag 5.______ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank. A. A filter B. A centrifuge C. A distiller D. A generator 6.The emulsion of the oil is mainly caused by ______. A. the solid impurities of large particle B. the solid impurities of fine particle C. the water content D. both water and solid impurities 7.Cylinders of marine diesel engines are normally cooled by ______. A. sea water B. fine mineral oil C. sanitary water D. fresh water 8.______ are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder. A. Diffusers B. Compressors C. Steam boilers D. Soot blowers 9.______ device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed. A. An automatic B. A transmission C. A self-regulating D. An interlocking 10.The difference between a supercharged engine and an un-supercharged engine is that ______ operates at an increased pressure. A. the later B. the latter C. the former D. the farmer 11.______ for attachment to the propeller shaft also accommodates the turning gear and is integrally forged with the crankshaft. A. The coupling flange B. The camshaft C. The cross-head pin D. The cylinder jackets 12.A(n) ______is a chemical or electro-chemical attack on the metal surface which may be further increased if the sea-water is polluted. A. errosion B. corrosion C. cavity D. scouring 13.The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being ______. A. shut B. closing C. opened D. closed 14.The governor of a generator engine is to ______. A. make the engine stop

第46期轮机英语试题

第46期轮机英语试题一单项选择题 D1. In order to concrol thermal stresses ,some types of modern engines use pistons with __ A heavy wall and intensive cooling B heavy wall and no cooling Cthin wall and no cooling D thin wall and intensive cooling B2. The average pressure exerted on a piston during each power stroke is termed A indicated B ean effective pressure C exhaust back pessure D compression pressure A3. The ignition quality of a diesel fuel is indicated by the___ A cetane number B volatility point C viscosity index Doctane number B4. A piston in a four stroke cycle disesel engine makes four stroke during each __ A crankshaft revolution B mechanical cycle of operation C period of two cobustion cycles D cycle of two events C5. Crankshafts of medium speed engines are _____from a single piece of steel A unusually solid welded B never be solid forged C almost invariably D almost invariably be welded B6 .The starting 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 D7 .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 B8 .Compared to four stroke cycle engines ,two ~stroke /cye diesel engines have the disadvantage of ________ A less even torque B higher cylinder head temperatures C fewer power strokes per revolution D greater weight /size requirements A9. _____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 metet DThe pressure switch 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 C11 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 D12. In a rubocharger ,inlet air velocity is increased in the __________ A inlet nozzle ring B stationary diffuser passages C compressor outlet volute D rotating impeller vanes C13 .Each cylinder has one starting valve which is usually opened by air pressure and closed by _________ A nuts and bolts B new joints C spring force D sealing rings B14. In a simple mechanical governor ,the _________ A centrifugal force rotates the ball-head