轮机英语大证考试模拟题(二)
轮机英语大证模拟试题(二)
1. Generally the symbol (GB786.1-93) of pressure reducing valve is ____.
A. C.
2. What should be cared before any inspection or maintenance is undertaken on the A.C. equipment?
A. Prevent equipment from corrosion
B. Ensure high voltage of equipment
C. Ensure isolation of equipment
D. Prevent equipment from sewage
3. 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 mixed water
D. by oily water
4. When the union purchase derrick is operated, one derrick is positioned over the quayside and the other almost vertically over the ____. A. cargo hold B. dock C. machinery space D. pedestal
5. If the main engine starting consecutively failed ____ times, it should be found the cause before next starting.
A.5
B.2
C.3
D.4
6. A centrifugal pump gradually develops insufficient discharge pressure. What corrective action is required?
A. Replace the wearing ring, shaft, and impeller.
B. Throttle in on the suction valve.
C. Throttle in on the discharge valve.
D. Replace the wearing rings.
7. The bearing shell generally has ____ for location and oil grooves round the center of its axial length.
A. tags
B. tips
C. keys
D. lips
8. Normally, in sufficient air results in the formation of black smoke which is accompanied by a tendency for the boiler to_____ or flutter. A. red color flame B. pulsate C. orange flame D. dark flame
9.Whether using a centrifuge or a simple filter, oil cleaning and filtration will be the most effective when the oil is at a ____.
A. low temperature and a low viscosity
B. low temperature and a high viscosity
C. high temperature and a low viscosity
D. high temperature and a high viscosity
10. Cooling of engines is achieved by circulating a cooling liquid around internal ____ within the engine.
A. means
B. air
C. passages
D. pipes
11. A distinguishing feature of an eductor, when compared to other pumps, is the ____.
A. ease at which the wearing rings may be changed
B. discharge end being smaller than the suction end
C. small size of impeller
D. lack of moving parts
12. The Pork State Control officer may witness a fire drill carried out by the crew assigned to these duties on the ____.
A. Navigation Log Book
B. Oil Record Book
C. Engine Room Log Book
D. Muster List
13. If liquid refrigerant accidentally comes in contact with the eyes, ____ immediately.
A. obtain medical help
B. irritate the eyes
C. wash the eyes with a heavy boric acid solution
D. rub the eyes
14. What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 r/min?
A. 1500 r/min.
B. 375 r/min.
C.750 r/min.
D. 500 r/min.
15. When the aerobic biological sewage treatment plant is put in operation, the air to_____ should be_____.
A. the aeration compartment/ pumped in continuously
B. settling compartment/supplied at intervals
C. settling compartment / pumped in continuously
D. the aeration compartment/ supplied at intervals
16. Fire dampers prevent the fire spreading through the process of ____.
A. radiation
B. conduction
C. direct contact
D. convection
17. Some main diesel engines are fitted with____, CO2 and steam extinguisher systems which should be utilized to extinguish fires in the scavenging spaces. A. 1211 B. dry chemical C. foam D. water
18. Before entering a fuel tank that has been cleaned, it should be checked with an oxygen indicator and a(an) ____.
A. flame safety lamp
B. Orsat apparatus
C. halide torch
D. combustible gas indicator
19. In a four-stroke/cycle diesel engine, after the completion of the power stroke, the piston will move ____.
A. down to burn off fuel
B. up and draw in a fresh air charge
C. down to compress the fuel air charge
D. up and force out the exhaust gases
20. Excessive lost motion in the valve mechanism of a duplex reciprocating pump will cause the_____.
A. cushioning valve to wear
B. pump to short stroke continuously at both ends of the stroke for both cylinder
C. pump to operate sluggishly
D. pistons to stop in mid-stroke
21. When the load of the engine increases, the electronic governor controller increase_____ to the torque motor which, in turn, causes the centre adjust end of the torque motor beam to be lowered.
A. resistance
B. power
C. voltage
D. current
22. Purging air from a hydraulic system is necessary when ____.
A. adding small amounts of oil to the system
B. the system has been overheated
C. the system has been drained and then filled with new oil
D. the system has been idle for a long period of time
23. ____ is used to separate two liquids or a liquid and solids as in contaminated oil.
A. Oily water separator
B. Clarifier
C. Centrifuge
D. Purifier
24. 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. reliability
B. capability
C. visibility
D. ability
25. A marine diesel engine is started by ____.
A. supplying high pressure oil into a hydraulic motor
B. supplying high temperature air into the cylinder
C. supplying high pressure air into the cylinder
D. electrical igniting
26. A re-heater, as used in an air conditioning system, is designed to control the ____.
A. dew point temperature
B. chilled water temperature
C. dry bulb temperature
D. primary air temperature
27. A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system may be used to avoid boiler ____. A. scaling at all exhaust temperature B. erosion at high engine loads
C. corrosion at low engine loads
D. overload at high engine loads
28. When a boiler load is normal, if the water level in sight glass keeps static for a very long time, it indicates that_____ connecting pipe(s) of water level gauge is/are clogged.
A. the water side
B. neither the steam nor the water side
C. the steam side
D. both the steam side and the water side
29. In a two-stroke engine, the piston consists of a lower part, the lower part is named as piston skirt and usually made of____.
A. low-half; cast iron; top-half; heat-resistant steel
B. low-half; aluminum; top-half; stainless steel
C. piston skirt; cast iron; piston crown; heat-resistant steel
D. piston skirt; aluminum; piston crown; stainless steel
30. When the water produced from most evaporator is supplied for drinking purpose, it must be treated to ensure it is biologically pure and ____. A. slightly acidic B. slightly bitter C. slightly alkaline D. no salty
31. Fuses placed in series with a thermal trip-type circuit breaker are used for ____.
A. short-circuit protection
B. sustained overload protection
C. time-delay protection
D. short duration surge protection
32. Increased air ____ will raise scavenge efficiency and allow a greater mass of air to be compressed; more fuel may now be burned giving an increased power. A. density B. viscosity C. specific volume D. calorific value
33. Each cylinder liner on the marine medium speed engines ____.
A. is in direct contact with the water in the bore of the cylinder
B. can be replaced when worn out
C. is usually cooled by sea water
D. can’t expand when heated
34. Electrically operated safety devices on auxiliary diesel engines function to stop the engine by ____.
A. over-speeding the engine
B. increasing the volume of intake air
C. shutting off the fuel supply
D. increasing the engine back pressure
35. Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass can result from a/an____.
A. low fluid viscosity around the shaft seal
B. overload on the pump motor
C. low fluid level in the reservoir
D. high level in the sump
36. Oil pressure in the lubrication system is ____ than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.
A. very lower
B. lower
C. higher
D. very higher
37. If a DC motor runs hot, the cause may be ____.
A. high mica condition
B. an open in the shunt field
C. clogged ventilation ducts
D. low ambient temperature
38. All engineer officers and engine room ratings shall be aware of the serious effects of operational or accidental pollution of the marine environment and shall take all possible ____ to prevent such pollution, particularly within the framework of
relevant international and port regulations.
A. precautions
B. programs
C. steps
D. procedures
39. With mechanical atomizer, the energy available to produce the correct atomization is dependent on the_____.
A. fuel pressure
B. fuel cloud point
C. atomizer type
D. atomizer size
40. Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and ____.
A. fluid friction
B. fluid turbulence
C. pressure surges
D. component misalignment
41.The double bottom of the ship is for strength and provides storage for_____.①fuel ②lubricating oil ③water
A. ①③
B. ③
C. ①
D. ①②③
42. Which of the following components provides a direct source of seawater for the fire main system?
A. Sluice valve.
B. Fire pump stuffing box.
C. Rose box.
D. Sea chest or spool piece.
43. Smaller equipment may be supplied via_____ or miniature circuit breakers.
A. fuses
B. exciters
C. wattmeter
D. commutators
44. ____ is provided to alternators, in the event of prime mover failure to ensure that the alternator does not act as a motor.
A. Synchronizing device
B. Frequency meter
C. Reverse current protection
D. Reverse power protection
45. Excessive alkalinity of the water in an auxiliary boiler can cause ____.
A. deposits on the boiler tubes
B. etching of the heat exchange surfaces
C. caustic embrittlement of the boiler metal
D. acidic corrosion of the boiler metal
46. ____ is a machine by which electrical energy is transformed into mechanical energy.
A. An electric motor
B. A main switchboard
C. An alternator
D. A diesel engine
47. When the main power is loss, the emergency generator starts ______; the main air switch of the emergency generator close ______.
A. manually/ manually
B. manually/ automatically
C. automatically / manually
D. automatically/ automatically
48. Auxiliary boilers are divided into several classifications, one of which is ____.
A. fire-tube supercritical circulation
B. fire-tube controlled circulation
C. water-tube natural circulation
D. water-tube express circulation
49. During disposal of solid waste in an incinerator, pay utmost attention to the_____ flue gas, and also watch out for the abnormalities A. temperature rise B. pressure drop C. density D. color
50. In a radial piston pump, reversal and control of fluid flow are accomplished by moving the ____.
A. radial plunger
B. central valve
C. floating ring
D. cylinder body
51. Fuel oil having a low cetane number rating could result in_____.
A. reduced ignition lag
B. excessive fuel oil consumption
C. improved cold weather start
D. smoother engine operation
52. For a general cargo ship, ____ is not the necessary certificate/document that the PSCO will examine.
A. Certificates of Competency
B. International Oil Pollution Prevention
C. Minimum Safe Manning document
D. Survey Report File
53. If an oil spill occurs on deck, you should ____.
A. wash down immediately with an oil dispersing solvent
B. cover the area with foam
C. cover the area with absorbent material
D. wash down immediately with a fire hose
54. A burner responsible for producing black smoke in an automatic auxiliary boiler, would be caused by a ____.
A. grounded high tension lead
B. faulty ignition cable connector
C. defective solenoid valve
D. dirty fuel nozzle
55. A re-heater in an air conditioning system functions to ____.
A. maintain relative humidity at 15%
B. control inlet air temperature
C. restore conditioned air temperature to a comfortable level
D. control inlet air volume
56. If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?
A. Pump only on the outgoing tide.
B. Pump only if the discharge is led to a shore tank or barge.
C. Pump only as much as is necessary.
D. Pump only during the hours of darkness.
57. Although not itself toxic, _____contributes to the greenhouse effect (global warming) and hence to change in the Earth’s atmosphere. A. carbon dioxide B. sulphur dioxide C. carbon monoxide D. sulphur trioxide
58. To avoid excessive surge pressure when bunkering, you should ____.
A. bunker at a normal rate
B. check for kinks in hose
C. close valves slowly
D. shut valves before topping off
59. To parallel an incoming machine to a running machine therefore it is necessary to ensure firstly that ____.
A. two frequencies must be brought into phase
B. the running machine must be unload
C. the incoming machine accepts a small amount of load
D. both voltages are equal
60. The incinerator air fan is installed to supply air for the following except_____.
A. combustion
B. vaporization
C. cooling
D. dilution
【关联题】The following table is abstracted from a report of PSC. It shows the deficiencies relating to the engine room
A. boiler pumps
B. electricity
C. refrigeration plant
D. auxiliary engines
62. (3) What is wrong with the boiler pumps?
A. One set is new while the other is being repaired
B. One set is under repair while the other has been repaired
C. One set is defective while the other is in good condition
D. Both sets have some troubles
63. (2) The deficiency for which Code 0230 stands is that______.
A. the chief engineer has only got a Second Engineer’s certificate
B. the second engineer has only got a Third Engineer’s certificate
C. the third engineer has got a Second Engineer’s certificate
D. the second engineer has not got any certificate
64. (1) The deficiency for which Code 0740 stand is that______.
A. there is not any emergency fire pump on board ship
B. there is a shortage in emergency power supply
C. the emergency fire pump is abnormal
D. there is a shortage in emergency fire pump
65. Your ship's certificates show that you did not do renewing work for certificate. All certificates have expired a few days before. Thus, your ship is ____. It follows therefore that she will ____.
A. seaworthy; be fined in our port
B. seaworthy; be assembled in our port
C. un-seaworthy; be disassembled in our port
D. un-seaworthy; be detained in our port
66. The additional mark ____ in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
A. AUT-O
B. AUT-1
C. MCC
D. BRC
67. “Movement of engine no longer required” means “_____”.
A. Stand-by Engine.
B. Stop Engine.
C. Finished With Engine.
D. No Engine Revolutions.
68. ____ means the level for which further specific protective security measures shall be maintained for a limited period of time when a security incident is probable or imminent, although it may not be possible to identify the specific target.
A. Security level 2
B. Security level 3
C. Security level 4
D. Security level 1
69. The color of the exhaust from a diesel engine should be _____ in normal operation.
A. clear
B. hazy light grey
C. hazy light brown
D. hazy light blue
70. In the voyage, when carrying out abandon ship drill，_____ should be test every time.
A. air/oil emergency shut-down
B. M.E emergency operation
C. the emergency lighting system for muster and abandon ship
D. main/auxiliary steering gear changing
71. The fire extinguishing action of CO2 comes mostly from ____.
A. isolating the heat from the fuel
B. smothering
C. cooling
D. breaking the fire chemical chain reaction
72. Oil Pollution Regulations require any transfer or discharge of oil or oily mixtures to be recorded in the ____.
A. bridge log
B. oil record book
C. Master's log
D. engine room log
73. ____ can cause oil flow from sludge outlet of self cleaning separator.
A. High level tank lack of water
B. Too much sludge accumulated in separator bowl
C. Oil input too rapidly
D. Diameter of gravity disc too large
74. Mooring winch should be equipped with mechanical brakes capable of holding_____.
A. the maximum expected tension of the mooring line
B. 50% over the working tension of the mooring line
C. the full breaking strength of the mooring line
D. half the breaking strength of the mooring line
【关联题】
The engine performance is usually evaluated by comparing them with the corresponding observations from when the ship was new. The best and most simple method of summarizing and obtaining a clear picture of the parameter changes is to use the synopsis diagram, which includes a model curve and an actual service curve. These curves illustrate the functional relationship between the measured data and the parameter they are most dependent on or related to. A deviation curve can also be drawn based on the above-mentioned two curves. From the deviation curve, it is possible to easily follow the development and to determine which engine components should be overhauled, and also, from the slope of the curve, to determine approximately when the overhaul should be carried out.
The mean indicated pressure is a very important parameter, and it, to a certain extent, represents the engine output, therefore the data of many other important parameters are analyzed as the function of the mean indicated pressure. In a synopsis diagram of the engine revolution, deviations from the model curve show whether the propeller is light or heavy, i.e. whether the torque on the propeller is small or large for a specified engine revolution. It is possible to judge whether the alterations are due to changes in the draught, or an increase in the propulsion resistance, for instance due to fouling of the hull. Valuable information is hereby obtained for determining a suitable docking schedule.
75. (4)According to the passage, to a certain extent, the engine output may be indicated by_____.
A. the RPM of the engine
B. the fouling of the hull
C. the MIP of the engine
D. the torque on the propeller
76. (3)The torque on the propeller may vary with _____. (M/E rpm keeps constantly)
A. sailing downstream
B. fouling of the ship’s hull
C. an decrease in the propulsion resistance
D. decreasing in the ship’s draught
77. (2)The word “deviation” in this passage means_____.
A. the difference between the model value and the actual value
B. the synopsis diagram
C. the model value
D. the actual value
78. By which curve can we determine some engine components should be overhauled?
A. An actual curve
B. A deviation curve
C. A MIP curve
D. A model curve
79. The ignition quality of a diesel fuel is indicated by the ____.
A. cetane number
B. volatility point
C. viscosity index
D. octane number
80. One of the factors limiting the amount of load which can be put on a modern marine diesel engine is the_____.
A. exhaust temperature
B. fuel injection pressure
C. speed of the cam shaft
D. governor sensitivity
81. A “dead front” switchboard is one ____.
A. without switches on it
B. without circuit breakers
C. without safety hand rails nor rubber mats
D. with insulated switches and no exposed terminals
82. The magnetic field is provided by electromagnets so arranged that adjacent poles have ____.
A. opposite polarity
B. positive polarity
C. negative polarity
D. the same polarity
83. Medium speed engines have a ____ power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have ____ maintenance intervals
A. higher; reduced
B. higher; increased
C. lower; increased
D. lower; reduced
84. The frequency of an AC generator is controlled by the ____.
A. exciter
B. governor
C. capacitor
D. theostat
85. When the ships is going to enter into the harbor, ____.
A. pump out bilge water
B. change sea chest form lower level one to high level one
C. change from diesel oil to heavy fuel oil for main engine
D. test emergency generator
86. Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because ____.
A. evaporation occurs at a higher rate
B. the incoming feed is at a higher temperature
C. no boiling occurs on heat transfer surfaces
D. the distillate produced has greater purity
87. When separating lube oil in oil separator the optimal separating quantity is ____ of the rated quantity on name plate.
A.100%
B. 1/5
C. 1/3
D. 1/2
88. The rate of heat transfer from a hot region to a cold region is affected most by the ____.
A. total heat of the system
B. size of the heat sink
C. temperature difference between the regions
D. size of the heat source
89. The purpose of the commutator and brushes on a D C generator is to ____.
A. conduct electric current to an outside circuit
B. provide excitation to a DC generator
C. neutralize armature reaction
D. convert DC current to the AC circuit
90. Heat exchanger are most commonly found in a small auxiliary diesel engine_____.
A. air starting system
B. lube oil system
C. governing system
D. fuel oil system
91. In an air conditioning system, low head pressure associated with a reciprocating compressor can be the result of ____.
A. tight drive belts
B. broken valve springs
C. high line voltage
D. air in the system
92. The officer in charge of the engineering watch shall ensure that all machinery involved with the maneuvering of the ship can immediately be placed in the ____ of operation when notified that the ship is in congested waters.
A. automatic mode
B. manual mode
C. remote mode
D. follow-up mode
93. Fires occurring in combustible metals, such as sodium or magnesium, are classified as a ____.
A. Class D
B. Class C
C. Class A
D. Class B
94. When deciding the composition of the engineering watch, which may include ____ appropriately, many factors shall be taken into account.
A. satisfied engineers
B. qualified chief engineer
C. satisfied chief engineer
D. qualified ratings
95. Which one of the following is not generally recognized as one constitute of bilge water?
A. Engine room cleaning water.
B. Oil leaking from tanks inside engine room.
C. Sewage water.
D. Water leaking from the separator sludge tank.
96. Why ship repair is an inherently difficult business to manage in the conventional sense?
A. Because it is cannot be well categorized.
B. Because it is seldom researched by researcher.
C. Because it is a difficult work for people to undergo.
D. Because it is difficult to plan and manage.
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