轮机英语第45期
1.These acid residues must be prevented from entering the crankcase otherwise the lube oil
would be _______
A. contaminated B .emulsified C deteriorated D .oxidated
2. The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its
_______
A. thermal efficiency
B. mechanical efficiency
C. brake thermal efficiency
D. volumetric efficiency
3. The cetane number of a diesel fuel oil medicates its _________
A. viscosity
B. acid content
C. heating value
4. The greatest turbulence in a diesel engine cylinder is created by the ________
A. shape of the combustion chamber
B. fuel injection spray pattern
C. cylinder swept volume
D. degree of penetration of the fuel oil droplets
5. The projection on a shaft designed to change circular motion into up and down or back and
fore motion is called ______
A. wheel
B. crankshaft
C. running gear
6. A clearly visible benefit of RT-flex engines is their ________operation at all ship speeds.This
is achieved by the superior combustion performance.
A. shockless
B. smokeless
C. no vibration D noiseless
7. A main bearing consists of two shells which are secured by means of studs and______
A. tie rods
B. through bolts
C. lead wires
D. bearing caps
8. Compared to four-stroke/cycle engines, two-stroke/cycle 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
9. ________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
10. A lubricant often has to perform many duties in any situation, in addition to its fundamental
job of __________
A. resisting oxidization
B. reducing friction
C. promoting moving speed
D. developing inertia
11. Shaker, circulation, and spray are the three general methods used in _______
A. pre-injection fuel oil treatment
B. lube oil filtration
C. lube oil purification
D. piston cooling
12. Which of the diesel engine components listed increases air density and helps to improve
engine operating efficiency?
A. Impeller
B. Air bottle
C. Air cooler D Exhaust diffuser
13. 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
14. Which of the listed governor characteristics will greatly affect the load sharing relationship
between paralleled diesel generators?
A. Sensitivity
B. Power
C. Speed droop
D. Compensation
15. A pyrometer is an instrument commonly used to measure_______.
A. cylinder pressure
B. flame intensity
C. exhaust gas temperature
D. crankshaft axial alignment
16. After starting a diesel engine, which of the listed operating conditions should be checked first?
A. Air box pressure
B. Lube oil pressure
C. Exhaust temperatures
D. Raw water pressure
17. A high temperature alarm or ______ which will melt is used to guard against the explosion of
compressor air pipelines.
A. a flame trap
B. a relief valve
C. a fusible plug
D. a bursting cap
18. Great care is dedicated to the removal of ______from the scavenge air.
A. gravity
B. viscosity
C. density
D. humidity
19. Lubrication for the main reduction gears used with diesel engines is usually supplied by ____
A. oil from the main engine sump
B. an independent lube oil system
C. the stern bearing head tank
D. the stern bearing sump tank
20. The maximum pressure developed by a waste heat boiler is determined by the main engine
exhaust ______.
A. gas composition
B. gas temperature
C. pressure
D. timing
21. The _____ is fitted in pair one is the main valve the other the auxiliary or standby.
A. main steam stop
B. auxiliary steam stop valve
C. feed check or control valve
D. blow down valve
22. Improper maintenance of the fuel oil burners in an automatically fired auxiliary boiler, could
result in _______.
A. increased fuel consumption
B. increased feed-water consumption
C. fuel pump failure
D. combustion control system failure
23. Burner ignition failure in an automatically fired auxiliary boiler would be caused by _____
A. a burned out solenoid in the oil supply valve
B. high temperature excess air
C. incorrectly setting the hot-well dump valve
D. an incorrectly positioned burner snubber (缓冲器) relay
24. Waterside scale in a fire-tube boiler may cause ______.
A. increased heat transfer
B. fireside erosion
C. high steam demand
D. overheated tubes
25. Throttling in the ________ line of a centrifugal pump involves the risk of the pump cavitation
A. suction
B. exhaust
C. pressure
D. discharge
26. Centrifugal pimp can be designed with a number of impellers _____ to attain a high final
delivery pressure.
A. at two ends of the same shaft
B. opposite each other
C. parallel
D. in series
27. Before disconnecting a joint in a pipeline, you should _______.
A. determine the size of the gasket
B. hang a bucket under the joint
C. have a first aid kit on hand
D. be sure no pressure exists in the line
28. To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the _____
A. pump must always be primed
B. volute must impart a radial and rotary motion of the water
C. suction side connection must guide the liquid to the lantern rings
D. stuffing box should not be allowed any water leakage
29. Which of the listed conditions can lead to cavitation in a centrifugal pump?
A. Vapor pockets formed in the suction flow stream
B. Rough casing volute surfaces
C. Worn wearing rings
D. Heavy fluid in the flow stream
30. 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
31. ______ is the circulation and refreshing of the air in a space without neccssarily a change of
temperature.
A. Refrigeration
B. Air conditioning
C. Ventilation
D. Heating
32. In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating
effect the primary refrigerant can be increased by _____.
A. increasing refrigerant pressure in the coil
B. increasing chilled water flow through the cooler
C. sub-cooling the refrigerant in the condenser
D. superheating the refrigerant in the compressor
33. If a plastic film insulation becomes damaged in air conditioning system,______ may form
within the film.
A. evaporation
B. condensation
C. liquefies
D. vaporization
34. The resistance to the movement of the globule in oily water mixture depends on its size and
the _________ of the fluid.
A. pressure
B. velocity
C. gravity
D. viscosity
35. Because the flow rate of supply water pump is too large, oily water separator does not work
well. Which of the following is not the reason.?
A. the monitoring equipment is out of orde r
B. separating effect becomes bad
C. separating effect becomes bad and inner wall is contaminated
D. inner wall is contaminated
36. Which of the following would not be burnt in an incinerator on board.
A. waste oil
B. waste clothes
C. oil rags
D. plastic garbage
37. Concerning the incinerator’s operating, which of the following is not correct?
A. scavenging time should be more than 30 seconds before igniting
B. the oil temperature of waste oil tank is 80~100℃
C. first igniting the incinerator with diesel oil, when the temperature of hearth is about 600℃
D. the ash from incinerator can be dumped into sea no distance limitation
38. _____ are used to digest the sewage to produce innocuous sludge in a biological sewage
treatment plant.
A. anaerobic bacteria
B. aerobic bacteria
C. air bubbles
D. disinfection chemicals
39. A centrifuge arranged to separate two liquids is known as ______.
A. an oily water separator
B. a purifier
C. a centrifugal compressor
D. a clarifier
40. A centrifugal fuel oil purifier should be shut down if ______.
A. more sealing water is needed
B. the over clamp needs tightening
C. the purifier has a bad vibration when started
D. water is discharged from overflow line
41.If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the_____
A. oil has a tendency to emulsify in the bowl
B. purifier will act as a clarifier at the discharge ring
C. oil will be lost through the water discharge ports
D. oil solids will be deposited only at the intermediate top disk
42. In a two-stage flash-type evaporator, excess brine in the first stage automatically passes_____.
A. directly to the second stage feed heater
B. directly overboard through the brine cooler
C. into the second stage flash chamber
D. into the second stage vapor condenser
43. In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?
A. Distiller air ejector cooling medium
B. Saltwater heater discharge
C. First-stage internal feed box
D. Second-stage internal feed box
44. Hydraulic control check valve can be used to ____ in the marine hydraulic mechanism.
A. control the back pressure of return oil
B. lock the oil lines under some conditions
C. permit oil flow with reversed direction
D. Second-stage internal feed box
45. The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the _______.
A. slide block
B. tilting box
C. pintle
D. reaction ring
46. The crane is usually mounted on a pedestal to offer adequate ________ to the operator.
A. time
B. space
C. length
D. visibility
47. 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
48. _______ with various arrangements of barrels are the usual mooring equipment used on board ships.
A. Cranes
B. Winches
C. Capstans
D. Windlass
49. Overheating of a hydraulic system may be a result of _______.
A. changing pump discharge pressure in response to normal load variations
B. a high oil level
C. incorrect fluid viscosity
D. continued slow re-circulation of the oil
50. In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid as this will cause _______.
A. molecular fluid vibration
B. energy losses
C .wide pressure variations D. mechanical damage to control valves
51. 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
52. What will be the phase angle relationship of a six-pole, three-phase, rotating field generator?
A. 60
B. 120
C. 180
D. 360
53. 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 incoming machine accepts a small amount of load
C. the running machine must be unload
D. both voltages are equal
54. The frequency of an alternator is controlled from the main switchboard by adjusting the _______.
A. frequency meter
B. voltage regulator
C. governor control
D. sychroscope switch
55. ______ is provided to alternators, in the event of prime mover failure to ensure that the alternator does not act as a motor.
A. Reverse current protection
B. Reverse power protection
C. Synchronising device
D. Frequency meter
56. _______ is used to control, modulate, monitor and protect generator set.
A. Control panel
B. Load panel
C. Paralleling panel
D. Busbar
57. 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
58. The ground terminal of a starter should be connected to ________.
A. the common ground point
B. the starter’s frame
C. the communicator
D. the starter’s mounting bolts
59. Which of the electrical properties listed will always be the same for each component in a parallel circuit?
A. Impedance
B. Current
C. Resistance
D. Voltage
60. In a series circuit, which value will remain unchanged at all places in the circuit?
A. V oltage
B. Current
C. Resistance
D. Inductance
61. In an alternating current electrical system, a low system power factor is a direct sign of _____
A. wasted energy
B. efficient operation
C. a short in the exciter field windings
D. an excessive number of minor system grounds
62. Accidental grounds in a shipboard electrical system must be repaired as soon as possible as they will ________.
A. result in immediate power outages
B. damage circuit breakers
C. appear on the ground detection system
D. damage insulation and may cause outage
63. If the main engine starting consecutively failed _______ times, the cause should be found and the trouble eliminated before next starting.
A. 2
B. 3
C. 4
D. 5
64. The normal color of the exhaust gas of the diesel should be _______.
A. achromatism or thin gray
B. thin white
C. sky-blue D black
65. After finished with engine, which of the following cannot be shut off by the duty engineer?
A. fuel valve
B. the main starting valve
C. the sea chest
D. the main sea water pump inlet valve
66. Before the seas get rough, it is a good safety practice to _______.
A. secure loose gear
B. move quickly about the ship
C. increase lighting
D. shutdown auxiliary equipment
67. A class “C” fire would occur in ________.
A. bedding
B. pipe insulation
C. paint
D. a generator
68. 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
69. Which of the fire extinguishers listed is to be weighed annually and sent ashore for recharging if the weight loss exceeds 10‰of the weight of a full charge?
A. Foam
B. Soda acid
C. Dry chemical
D. Carbon dioxide
70. Which of the following components provides a direct source of seawater for the fire main system?
A. Rose box
B. Sea chest
C. Sluice valve
D. Fire pump stuffing box
71. When administering artificial respiration, it is of the utmost importance to ________.
A. use the mouth-to-mouth method
B. clear airways
C. use rhythmic pressure method
D. check the injured person’s heartbeat
72. Obviously, for a given fuel oil, its pour point is _______ its cloud point.
A. lower than
B. higher than
C. as same as
D. better than
73. ____, 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. V oyage repairs
B. Routine docking
C. Damage repairs
D. conversion
74. When the dock is refilled with water after docking repair, the first work which should be done by engineer department is ________.
A. igniting auxiliary boiler
B. releasing air in sea water system
C. starting generator
D. cut off shore power
75. 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
76. In the Oil Record Book, a comprehensive list of operational items are grouped into operational sections Each section is codified by a/an ________
A. number
B. abbreviation
C. letter
D. number, abbreviation and letter
A. an International Ship Security Certificate
B. an International Oil Pollution Prevention Certificate
C. a Safety Management Certificate
D. an International Ballast Water Management Certificate
78. Which one is not the “clear grounds” for a more detailed inspection?
A. the master and the chief engineer are unable to communicate effectively
B. serious corrosion on the hull
C. damaged sanitary pump
D. one page missing in the oil record book
79. “Insufficiency of manning or insufficiency of certification of seafarers” is an identification of a ________
A. substandard ship
B. standard ship
C. over-standard ship
D. reference ship
80. STCW 78/95 Convention shall apply to seafarers _____ on board seagoing ship entitled to fly the flag of a Party.
A. served
B. serving
C. surveyed
D. surveying
81. The officer in charge of the engineering _______ the watch to the relieving officer if there is reason to believe that the latter is obviously not capable of carrying out the watch-keeping duties effectively.
A. shall take over
B. shall not take over
C. shall band over
D. shall not hand over
82. When the order given by bridge may have bad results, the duty engineer should_____
A. inform the captain for a further consideration
B. inform the captain, and not perform it
C. stop the M/E immediately, and then inform the chief engineer
D. stop the M/E immediately, and then inform the captain
83. The scuppers should be plugged _____.
A. only if fixed containment is not used
B. only if portable containment is not used
C. only if fixed containment drains are open
D. whenever the vessel is being bunkered
84. If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?
A. Pump only if the discharge is led to a shore tank or barge
B. Pump only during the hours of darkness
C. Pump only on the outgoing tide
D. Pump only as much as is necessary
85. The SOLAS convention prescribes that in the fire fighting drill the duty engineer should start the fire pump and supply deck water in _______ minute(s)
A. 5
B. 3
C. 2
D. 1
86. 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 shop
D. the designated person ashore
87. In order to strengthen maritime security and prevent and suppress acts of terrorism against shipping, a new, comprehensive security regime for international shipping was set to enter into force in July 2004. The new regime is ________.
A. ISM Code
B. ISPS Code
C. FSS Code
D. IBCC Code
88. In the voyage, when carrying out abandon ship drill, ________ should be test every time.
A. the emergency lighting system for muster and abandon ship
B. air/oil emergency shut-down
C. M.E. emergency operation
D. main/auxiliary steering gear changing
二．关联题（关联题干下有4个小题，每小题4个选项）
第一组
Scavenge port inspection provides useful information about the condition of cylinders, pistons, and rings, at low expense. The inspection consists of visually examining the piston, the rings and the lower part of the cylinder liner, directly through the scavenge air ports To reduce the risk of scavenge box fire, remove any oil sludge and carbon deposits in the scavenge air box and receiver in connection with the inspection.
The port inspection should be carried out at the first stop after a long voyage, e.g. by anchoring if possible, to obtain the most reliable result with regard to the effectiveness and sufficiency of the cylinder lubrication and the combustion cycle (complete or incomplete)
A misleading result may be obtained if the port inspection is carried out after arrival at harbor, since manoeuvring to the quay and low-load running, e.g. river or canal passage, requires increased cylinder oil dosage, i.e. the cylinders are excessively lubricated, Further, during low load, the combustion ccle might not be as effective and complete as expected, due to the actual fuel oil qualities and service (running) condition of the fuel injection equipment. It is highly recommended to take this information into consideration.
89. The components of an engine involved in normal scavenge port inspection comprise _______.
①the piston ②piston rings ③the lower part of the cylinder liner ④the fuel injector
A.①②
B. ①②③④
C. ②③
D. ①②③
90. If the scavenge box had too much oil sludge and carbon deposits, what would occur?
A. excessive cylinder oil consumption
B. the scavenge box fire
C. the crankcase explosion
D. excessive wear of the cylinder liner
91. In order to obtain the most reliable result with regard to the effectiveness and sufficiency of the cylinder lubrication and the combustion cycle, when should the scavenge port inspection be carried out?
A. at the first stop after a long voyage, e.g. by anchoring if possible
B. at the first stop after arrival at harbor
C. at the first stop after low load running
D. at the first stop after passing river or canal passage
92. Under what condition that the scavenge pot inspection can gain a misleading result?①after passed through Panama Canal ②after got alongside shanghai quay ③after arrival shanghai roadstead (外锚地)
A. ②③
B. ①②
C. ①②③ D ①
第二组
Current regulations with respect to the discharge of oily water set limits of concentration 15 parts per million. A monitor is required to measure these values and provide both continuous records and an alarm where the permitted level is exceeded.
The principle used is that of ultra-violet fluorescence. This is the emission of light by a molecule that has absorbed light. During the short interval between absorption and emission, energy is lost and light of a longer wavelength is emitted. Oil fluoresces more readily than water and this provides the means for its detection.
A sample is drawn off from the overboard discharge and passes through a sample cell. An ultra-violet light is directed at the sample and the fluorescence is monitored by a photoelectric cell
Where an excessive level of contamination is detected an alarm is sounded and diverting valves are operated. The discharging liquid is then passed to a slop tank.
93. The passage is mainly about ________.
A. oily water separator
B. current regulations related to oil pollution
C. oil in water monitor
D. the principle of ultra-violet fluorescence
94. A monitor can obtain all of the following functions except _______.
A. measuring oil content values
B. providing continuous records
C. lowering the oil content below 15 ppm
D. providing an alarm unit warning of levels of discharge in excess of 15 ppm
95. From the passage, we can learn that the ultra-violet fluorescence is a kind of________
A. oil sample
B. light
C. photoelectric cell
D. alarm unit
96. A sample is drawn off from ______ and passes through a sample cell
A. bilge water
B. discharge of oil separator
C. slop tank
D. discharge of oily water separator
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
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?
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
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
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
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