轮机大管轮英语真题45期
中华人民共和国海事局
2008年第1期海船船员适任证书全国统考试题(总第45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 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. Piston cooling fins are located .
A. atop the piston crown
B. beneath the piston crown
C. at the base of the piston skirt
D. inside the cylinder liner cooling water jacket
3. Which of the following conditions is realized by the turbo-charging of a previously naturally aspirated diesel engine?
A. Ignition lag increases.
B. Lube oil system pressure increases.
C. Brake specific fuel consumption increases.
D. Mechanical efficiency increases.
4. Which of the following represents the significance the fuel oil cetane number?
A. The cetane number has no affect on injection lag.
B. The cetane number is an indication of the fuel's viscosity.
C. Ignition lag is reduced with fuels having a high cetane number.
D. The cetane number is of little significance in the combustion process.
5. Indirect cooling of fuel injector nozzle holders for diesel engines is accomplished primarily by
A. heat conduction into the injected fuel oil
B. heat conduction into the water jacket wall
C. water circulation through passages in the holder
D. fuel oil circulation through passages m the holder
6. The upper piston rings m large, slow-speed, two-stroke/cycle diesel engines are most effectively lubricated by oil ____.
A. fed from mechanical lubricators
B. thrown off from the main bearings
C. supplied from wick fed drip lubricators
D. flow from a centrifugal or banjo oiler
7. 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
8. Exhaust gases are generally removed from the cylinders of a two-stroke/cycle diesel engine by .
A. natural aspiration
B. masked intake valves
C. air ceils
D. scavenging air
9. Vessels having main engines arranged for air starting are to be provided with at least__.
A. one automatic drain serving both containers
B. two air starting containers of approximately equal size
C. one control air container and one starting air container
D. one additional means of starting the main engine 10. When the prime movers of two paralleled generators are equipped with mechanical-hydraulic governors, and are operating within their designed range, the unit with the least amount of speed droop will .
A. pick up more of any increase in load
B. pick up less of any increase in load
C. share an equal amount of any increase in load
D. drop an equal amount of any decrease in load
11. Exhaust gas pyrometers are useful for .
A. detecting faulty combustion in individual cylinders
B. adjusting fuel racks to maintain equal loading between cylinders
C. adjusting the load limit setting of the governor at idle conditions
D. calculating engine horsepower
12. When the ships 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 form 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 load
C. check thermostatic valve
D. clean sea water strainer
14. When using a fuel with a higher than normal sulfur content in an auxiliary four stroke diesel engine, you may .
A. maintain higher than normal jacket water temperature
B. change the lube oil more frequently than normal
C. maintain a higher air-box temperature than normal
D. maintain a higher air-box pressure than normal
15. A crack in a cylinder liner can be caused by .
A. worn piston rings
B. installation of undersized sealing rings
C. operating the engine at low loads
D. restricted cooling water passages
16. In a diesel engine, when refitting piston rings you should .①check the ring gap at the smallest diameter of the cylinder ②remove carbon from the ring groove
A.①
B.②
C. ①②
D. neither ① nor ②
17. Which of the following problems is the main source of fuel pump and injection system malfunctions?
A. Improper lubrication
B. Air in the fuel system
C. Coated fuel lines
D. Excessive vibration
18. Which of the following problems can occur if you continually fail to drain off condensate from a starting air receiver?
A. Corrosion and eventual failure of the tank.
B. Gumming of the tank relief valves.
C. Immediate failure of components downstream of the compressed air system.
D. Boiling of the water oil mixture as pressure is reduced.
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 in the need to adjust the .
A. pilot valve opening
B. compensating needle valve
C. compensating spring tension
D. accumulator spring tension
20. Oil oxidation as a result of excessively high lube oil temperature, is harmful to a diesel engine Because .
A. oil foaming will always occur
B. large quantities of oil are consumed
C. lube oil viscosity is always decreased
D. corrosive by-products are usually formed
21. A dry-type spark arrestor removes sparks from a diesel engine exhaust by ____.
A. increasing the linear velocity of the exhaust gases
B. changing directions of exhaust gas flow
C. decreasing the temperature of the exhaust gases
D. accelerating the exhaust gas through a reduced size orifice
22. If the engine does not start on air, it may be due to .
A. low compression of the fuel pumps
B. incorrect timing of fuel pumps
C. the starting air valves stuck
D. air-locks in fuel oil pipeline
23. A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of
a/an .
A. turbocharger malfunction or failure
B. crankcase exhauster overload
C. overload on the intercooler
D. obstruction in the engine cylinders
24. 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
25. To prevent excessive __ in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible.
A. thermal stresses
B. bending moments
C. thermal loads
D. surface tensions
26. Compared to a constant pitch propeller, a controllable pitch propeller .
A. more efficiently uses available engine power
B. operates at a lower efficiency at a fixed speed
C. produces the same torque at lower engine power
D. develops its rated power at a lower speed
27. The oil index of main engine should be controlled to prevent it from ____ in heavy weather.
A. over heat
B. over speed
C. over pressure
D. over worn
28. In the navigation, cause the shafting over load most easily.
A. stopping the main engine suddenly
B. changing the main engine running direction suddenly
C. the sailing from the shallow water area to the deep water area
D. the ship's trim too much
29. A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of .
A. water
B. babbitt
C. iron or steel
D. acids
30. The temperature of the refrigerant in the evaporator coil depends mostly upon the ___.
A. refrigerant pressure in the evaporator
B. cooling water temperature to the condenser
C. heat load in the refrigerator compartment
D. solenoid valve in the liquid line
31. Excessive oil foaming in the crankcase of a refrigeration compressor is most likely to occur when the compressor .
A. has run continuously for a long period
B. suction pressure is below normal
C. oil level is below normal
D. starts after a long idle period
32. In the presence of an open flame or hot surfaces, chlorinated flourocarbon refrigerants decomposes and form . A. petroleum crystals B. phosgene gas C. water vapor D. carbon monoxide
33. Some refrigeration systems have chemical moisture indicators installed in conjunction with the sight glass in the liquid line. If excess moisture is present in the system, the indicator will .
A. activate the driers
B. change color
C. secure the compressor
D. add a predetermined amount of liquid drier
34. If a refrigeration compressor is short cycling on high head pressure, you should .
A. purge the condenser if the waterside is dirty
B. check for proper water flow through the condenser
C. increase the high pressure cutout setting
D. reduce the cooling water flow
35. Low compressor head pressure in a refrigeration system can be caused by ___.
A. insufficient condenser cooling water
B. excessive condenser cooling water
C. air in the refrigeration system
D. excessive refrigerant in the system
36. To ensure oil purifier working in normal condition, the interval between two sludge discharging should not exceed hours.
A. 2
B. 4
C. 5
D. 6
37. One of the reasons that causes oil flowed from sludge outlet of a self-cleaning purifier is .
A. seal water supply be cut off
B. make-up water supply be cut off
C. oil outlet valve closed or not open sufficiently
D. the flow rate of oil is too much
38. Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?
A. hydraulic pumps
B. valves
C. hydraulic cylinders
D. hydraulic motors
39. Positive displacement, helical gear pumps are well suited for pumping oil because .
A. stuffing boxes eliminate the leakage problems usually associated with other gear pumps
B. it is not necessary to closely maintain design clearances with this pump
C. they are essentially self-priming and produce a high suction lift
D. these pumps are designed with extreme tooth angles
40. The in the steering gear move the rudder to the required angle.
A. control equipment
B. power unit
C. transmission mechanisms
D. fittings and pipeline
41. Air trapped in the hydraulic fluid of a steering system may be indicated by .
A. the steering pumps overspeeding
B. a jammed open relief valve
C. a constantly occurring improper rudder response
D. excessive ram pressure
42. The ability of lubricating oils to resist viscosity changes during temperature changes is indicated
by the ____.
A. American Petroleum
B. Institute number viscosity index number
C. Seconds Saybolt Furol number
D. Seconds Saybolt Universal number
43. Before doing any work on a hydraulic system equipped with accumulators, you should .
A. drain the accumulators and purge with oxygen
B. bleed off all stored energy from the accumulators completely
C. charge the accumulators to prevent system energy loss
D. pump the hydraulic fluid into the accumulators to prevent fluid loss
44. In a modern three-phase A.C. synchronous brushes generator, the excitation winding is on the rotor. That means .
A. The generator need not excitation.
B. The winding on the rotor is for inputting excitation current.
C. There are three phase windings on the rotor.
D. The generator has no brushes.
45. The magnetic field is provided by electromagnets so arranged that adjacent poles have ___.
A. opposite polarity
B. the same polarity
C. negative polarity
D. positive polarity
46. An alternator is being paralleled with one on the line. At the instant the circuit breaker is close, the frequency of the incoming alternator will normally .
A. increase
B. not change
C. decrease
D. be exactly 60 hertz
47. The division of kilowatt load between two paralleled alternators is determined by the .
A. amount of field excitation of the leading machine
B. load-speed characteristics of the governors
C. amount of field excitation to the lagging machine
D. type of alternator
48. Electric insulation is made of organic substances and so gradually with age.
A. deteriorates
B. increases
C. are fouled
D. becomes better
49. After a ship enters service it is for the main bus-bar to be made dead.
A. usually
B. commonly
C. exceptional
D. unavoidably
50. Usually, emergency electricity supplies to on board.
A. Cargo winch
B. Windlass
C. Steering gear
D. Main air compressor
51. The control mode in which tile final control element is moved from one of two fixed positions to the other is known as .
A. dead band action
B. neutral zone action
C. range
D. on-off action
52. The is used to measure the volume of a liquid or gas through a pipeline within any given period of time.
A. flow-meter
B. viscometer
C. micrometer
D. feeler
53. The seven segment arrangement for numerical(数字的) display on consoles, test meters and other applications can be either .
A. UJT or BJT
B. BCD or OCD
C. JFET or IGFET
D. LED or LCD
54. Which of the following is operated from the main engine room console on an automated vessel?
A. Fire pump and lube oil pump
B. Lube oil pump and distilling plant
C. Distilling plant and shaft alley door
D. Shaft alley door and fixed CO2 release
55. Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except .
A. open the indicator cocks
B. supply some CYL.Oil to cylinder liner wall with lubricator (only for two stoke diesel engine)
C. put the fuel handle in the "stop" position
D. pump up the air bottle
56. During the watch keeping at sea, the engineer in charge should notify in the event of any serious occurrence or a situation where he is unsure of the action to take.
A. the master
B. the chief engineer
C. the bridge
D. the company superintendent
57. When the ship, its main propulsion device equipped with clutch, arrived at the port and finished with the engine, the correct operation should be .
A. disengaging the clutch firstly, then stopping the main engine
B. stopping the main engine firstly, then disengaging the clutch
C. stopping the cooling water pump firstly, then stopping the main engine
D. stopping the main engine and disengaging the clutch at the same time
58. 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
59. An example of class 'A' fire is a/an .
A. electrical fire in the engine room
B. oil fire in the engine room bilges
C. oil fire involving a grade 'A' petroleum product
D. mattress fire in a crew's cabin
60. Which of the following conditions is true concerning a flammable liquid with a concentration above the upper explosive limit?
A. The mixture is too lean to burn.
B. The mixture is too rich to burn.
C. The vapor is about to explode.
D. Conditions are perfect for combustion.
61. One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is .
A. the 'snow' which is sometimes discharged along with the gas is toxic
B. prolonged exposure to high concentrations of CO2 gas causes suffocation
C. rapid dissipation of the CO2 vapor
D. the CO2 gas is lighter than air and a large amount is required to extinguish a fire near the deck
62. While on watch in the engine room, you hear a continuous sounding of the general alarm. Which of the following actions should yon take?
A. Make an entry in file official logbook.
B. Open the master control valves on the fixed CO2 system.
C. Start the fire pump and check discharge pressure.
D. Secure auxiliary condenser overboard discharge.
63. All crew's assigned emergency stations can be found on the ship's .
A. muster list
B. certificate of inspection
C. clearance papers
D. permit to proceed
64. As for turbine oil, contact with water in the form of steam will be inevitable so good properties will be essential.
A. defrosting
B. de-oiling
C. demulsifying
D. dehumidifying
65. The purpose of treating the cooling water of the diesel engine is to . I. resist the scale formation in the cooling chamber II. lubricate the engine part III. increase thermal capacity IV. resist corrosion
A. I+ II
B. II +III
C. III+IV
D. I +IV
66. A is the documentary attestation for the delivery of stores and spare parts.
A. engine logbook
B. delivery docket
C. store booklet
D. maintenance book
67. , where the ship is docked for hull coating renewal, and for any other required underwater work to be carried out, when the opportunity is taken to make other repairs.
A. Voyage repairs
B. Routine docking
C. Damage repairs
D. Conversion
68. During the dock repair, should be measured firstly before tail shaft drawn out.
A. the sinking of tail shaft
B. the clearance of stern bearing
C. the total flexure of shaft
D. main engine crankshaft deflection
69. During sea trial, the main engine will be kept run at load.
A. 100%
B. 110%
C. 85%
D. different
70. The correct tightening is obtained by the use of to measure the extension given to the bolts.
A. pressure gauges
B. thermometers
C. stretch gauges
D. bridge gauges
71. Which of the following operations need NOT to be entered on the Oil Record Book Part I? I. Disposal of oil residues. II. Internal transfer of fuel oil
A. I only
B. II only
C. both I and II
D. neither I nor II
72. During the PSC inspection, under the provision of SOLAS74, which one may not be regarded as clear grounds for ships' detainment?
A. excess amount of oily-water mixtures in bilges
B. insulation of piping inc luding exhaust pipes in engine room contaminated by oil
C. improper operation of bilge pumping arrangements
D. paint peeling off the uptake
73. 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
74. The Convention is the first to establish basic requirements on training, certification and watch-keeping for seafarers on an international level.
A. STCW78
B. STCW95
C. SOLAS74
D. SOLAS88
75. The officer in charge of the engineering watch shall notify the chief engineer without delay ____.
A. in any emergency or if in any doubt as to what decision or measures to take
B. in the event of any impending action in machinery spaces that may cause reduction in ship's speed
C. when isolating and bypassing machinery to be worked on
D. co-operating with any engineer in charge of maintenance work
76. The bridge should inform the engine room before passing through congested or shallow waterway.
A. 24 hours
B. 2 hours
C. 1 hour
D. 15 minutes
77. In cleaning up an oil spill, the use of chemical agents would .
A. absorb the oil for easy removal
B. remove the oil from the water
C. disperse or dissolve the oil in the water
D. not affect the oil
78. According to the international regulations concerning the prevention of pollution of sea areas from ships, the disposal into the sea of all plastics is .
A. welcome
B. admitted in some special sea areas
C. prohibited
D. acceptable
79. International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC Code) of .
A. SOLAS
B. MARPOL
C. STCW
D. Ballast Water convention
80. According to the ISM CODE, the "person" in the phrase 'to designate a person or persons ashore having direct access to the highest level of management' refers to .
A. the manager of the shipping company
B. the master of the ship
C. the designated person on board ship
D. the designated person ashore
81. 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
82. The installation and provision of fire fighting equipment is mainly subject to ___.
A. ISM code
B. ISPS code
C. IBC code
D. FSS code
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
Older loop scavenged engines may have a single injector mounted centrally in the cylinder head. Because the exhaust valve is in the center of the cylinder head on modern uniflow scavenged engines the fuel valves (2 or 3) are arranged around the periphery of the head. The pressure at which the injector operates can be adjusted by adjusting the loading on the spring. The pressures at which the injectors operate vary depending on the engine, but can be as high as 540 bar. Some injectors have internal cooling passages in them extending into the nozzle through which cooling water is circulated. This is to prevent overheating and burning of the nozzle tip. Injectors on modern engines do not have internal cooling passages. They are cooled by a combination of the intensive bore cooling in the cylinder head being close to the valve pockets and by the fuel which is re-circulated through the injector when the follower is on the base of the cam or when the engine is stopped. As well as cooling the injector, re-circulating the fuel when the engine is stopped keeps the fuel at the correct viscosity for injection by preventing it from cooling down. Fuel injectors must be kept in good condition to maintain optimum efficiency, and to prevent conditions arising which could lead to damage within the cylinder. Injectors should be changed in line with manufacturers' recommendations, overhauled and tested. Springs can weaken with repeated operation leading to the injector opening at a lower pressure than designed. The needle valve and seat can wear which together with worn nozzle holes will lead to incorrect atomization and dribbling.
83. Modern uniflow scavenged engines have .
A. a single injector mounted in the center of the cylinder head
B. several injectors mounted around the external boundary of the cylinder head
C. a single injector mounted at the external boundary of the cylinder head
D. several injectors mounted in the center of the cylinder head
84. Cooling water is circulated through in some injectors.
A. the nozzle
B. the nozzle tip
C. the internal passages
D. the fuel re-circulated
85. Re-circulating the fuel when the engine is stopped can .①keep the fuel at the correct viscosity
②cool the injector
A. ①
B. ②
C. ①②
D. neither ① nor ②
86. Springs in fuel injectors will become not strong enough to work because .
A. the injector opens at a lower pressure than designed
B. the needle valve and seat wear out
C. the nozzle holes wear out
D. long time in use
第二组
Displacement pumps are those where the volume of the pump chamber is alternately increased to draw the liquid in from the suction pipe and then decreased to force the liquid out into the delivery pipe. Centrifugal pumps are those wherein an impeller rotating at high speed throws the liquid by centrifugal force from the center to the periphery of the impeller where the liquid is discharged through the delivery outlet.
Gear pump consists of two or more meshing gears (spur, single or double helical teeth) enclosed m a close-fitted housing. These are used extensively for pumping fuel oil, lubricating oil and hydraulic oil. When gears are unmeshed on the inlet side, a pressure drop occurs that helps the atmospheric pressure acting on the surface of the oil in the reservoir to force it up the pipe to fill the void, the oil is then transferred around the periphery of the pump housing. As the gear teeth mesh again on the outlet side, they form a seal that prevents oil from backing up to the inlet, the oil in the void is then be forced out into the discharge line.
All vane pumps have a rotor driven within a ring (cam ring) by a drive shaft coupled to a prime mover. A cylindrical rotor with sliding vanes, generally in radial slots, rotates within the ring. The center of the rotor is offset from the center of the ring. In a simple vane pump, as the rotor turns, the vanes are forced outward against the inner surface of the cam ring by centrifugal force. This outward radial movement of the vanes and turning of the rotor causes the chamber between the vanes to increase as the vanes pass further away from the inlet port. This increase in volume results in a lowering of pressure until the atmospheric pressure is sufficient to force oil from the reservoir into the inlet chamber. Oil from the inlet is swept away by the vanes toward the outlet port through a decreasing series of chambers until it is forced through the outlet port. A vane pump of balanced design has an elliptical cam ring so that two pumping chambers are formed. This pump is in hydraulically balance, since the two intake and two outlet ports are diametrically opposed to each other. Therefore the side loads exerted on the rotor cancel out, thereby increasing bearing lift and permitting high operating pressure.
87. According to the last sentence of paragraph 1, from where the liquid is discharged through the delivery outlet?
A. from the eye of the impeller
B. from passage of impeller
C. from the periphery of the impeller
D. from the impeller
88. Which statement is NOT true?
A. In a simple vane pump, the rotor and cam ring are exactly concentric
B. Balanced vane pump has an elliptical cam ring
C. Liquid in both gear pump and vane pump are forced out to the outlet.
D. Balanced vane pumps can work at a higher pressure than the simple vane pump
89. Gear pumps are widely used to transfer any one of the following but .
A. fuel oil
B. lube oil
C. hydraulic oil
D. fresh water
90. Which statement is NOT true?
A. While displacement pump works, volume of the working chamber will increase and decrease alternately
B. A gear pump always has two gears.
C. Any vane pump will have a rotor within a ring
D. A balanced vane pump has two outlet ports and they are positioned symmetrically.
第三组：
Ship recycling contributes to sustainable development and is the environmentally friendly way of disposing of ships with virtually every part of the hull, machinery, equipment, fittings and even furniture being re-used. However, while the principle of ship recycling is a sound one, the reported status of working practices and environmental standards in recycling facilities often leaves much to be desired. Such growing concerns about environmental safety, health and welfare matters in the ship recycling industry have resulted in a growing belief that an international instrument to regulate the ship recycling process is urgently needed.
Having become aware of the need to reduce the environmental, occupational health and safety risks related to ship recycling, as well as the need to secure the smooth withdrawal of ships that have reached the end of their operating lives, the International Maritime Organization (IMO) has taken action to develop a realistic and effective solution to the problem of ship recycling, which will take
into account the particular characteristics of international maritime transport and the economic realities.
91. Which statement of the following is true?
A. Ship recycling is sustainable.
B. Ship recycling is very friendly to our environment.
C. Ship recycling is the best way to dispose the machinery, equipment, fittings and even furniture on board.
D. Ship recycling brings many problems concerning environmental safety, health and occupational safety.
92. Which information is not given in the text?
A. Ship recycling contributes to sustainable development.
B. The IMO believes that making an international instrument to regulate the ship recycling process is urgently in need.
C. An international convention on ship recycling has been adopted.
D. The IMO has taken action to develop an effective solution to the problem of ship recycling.
93. What is the best explanation to the underline phrase "to secure the smooth withdrawal of ships"?
A. To withdraw a ship mid make it in a safe condition.
B. To secure the life of a ship and recycle it.
C. To break a wreck.
D. To finish the service of a ship and break it without other problems.
94. What is the main problem lied in the ship recycling industry?
A. It lies in the sustainable development.
B. It is about how to recycle the ship as they can as possible.
C. It is a big problem concerning environment, safety and health.
D. The big problem is that ship-recycling will violate the regulations made by IMO.
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
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?
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