2013年9月份-10月份轮机英语大证考试真题整理(一)
P377-P386
Which of the following can be used in transmission system usually?
A Hydraulic oil B. Animal oil C. Light oil D. Fuel oil
The rotor of the hydraulic motor rotates at a speed proportional to the _______.
A. flow of oil
B. pressure of oil
C. low and pressure of oil
D. temperature of oil A pump shaft that is bent or distorted should normally be ______.
A. repaired by a suitable welding process
B.. straightened by applying heat and torsion
C. reconditioned by metallizing and machining
D. replaced with a satisfactory spare
During the running period of the diesel engine,if the supply of cooling water is interrupted or teh temperature of cooling water out of the cylinder is too high, the duty engineer should _________.
A.notify the duty officer, reduce the engine speed, take some measures to remove failures.
B.notify the duty officer, and stop the rngine immediately, find the cause and remove failure
C.notify the C/E
D.notify the captain
An inadequate reciprocating bilge pump discharge is most often caused by ________.
A.Defective safety valves
B.clogged suction strainers
C. Scarred cylinder walls
D.clogged drain valves
Which of the listed devices would be installed at a control system air pressure reducing station? A.Moisture separator B. Vacuum breaker
C.Lubricator
D. Non-return valve
The instrument which the emergency switchboard doesn’t need is ______.
A.ammeter
B. Voltage
C. Wattmeter
D. synchronous meter
At which od the following locations would a duplex pressure gage most likely be located in te fuel oil system?
A. Fuel oil service pump discharge flange
B. Five years from the date of issue
C. Three years from the date of issue
D.. Fours years from the date of issue
The ______is developed in response to the perceived threats to ships and port facilities in the wake of the 9/11attacks in the United States.
A.ISM Code
B. SMS .
C. ISPS Code
D. SOLAS, 1974
When using a fuel withe a higher than normal sulfur content in an auxiliary four strike diesel engine, you may_________
A.Maintain higher than normal jacket water temperature
B.Change the lube oil more more frequently tan nomal
C.Maintain a higher air--box temperature than normal
D.Maintain a higher air--box pressure than normal
Usually ______handles the majority of the correspondence and negotiation needen during transactions of stores and spare parts in the engine department.
A.the chief engineer
B. the second engineer
C. the captain
D.the chief mate Before the oily water separator put into operation, it should be _______.
A.filled with bilge water
B. Filled with oil
C. Filled with clean water
D. Emptied
Relief valves are usually used to ________.
A.control the fluid flow through it
B.prevent the pressure before relief valve over the specified value
C.make the pressure after relief valve steady
D.control the direction of oil flow
Prior to starting an AC generator prime mover, the voltage regulator cutout switch should be placed in the ______.
A.manual position
B. bus neutral position
C. raise voltage position
D.transfer position
英语2
The function of damper windings in a synchronous motor is to ________.
A.eliminate slippage
B. provide excitation
C. provide starting torque
D. increase efficiency For the portable lighting, its safety voltage can not exceed_______.
A. 50V
B. 36V
C. 24V
D. 12V
During the watch keeping at sea, routine adjustments should be _______
A.made and noted as requires by the duty engineer
B.reported to chief engineer immediately after being made by the duty engineer
C.never made before getting permission from chief engineer
D.made as required but not logged
The _______convention is the first to establish basic requirements on training , certification and watching -keeping for the seafarers on an international level.
A.STCW78
B. STCW95
C. SOLAS 74
D. SOLAS 88
The officer in charge of the engineer watch shall ensure that at all times bridge orders relating to change in _______of operation are immediately implemented.
A.ahead or astern
B. fore or aft
C. up and down
D.speed or direction
Most medium-speed diesel engines are non-reversible meaning that _________is usually employed to cater for astern thrust .
A.A controllable pitch propeller
B. a remote controller
C. bridge control .
D.concentration control
Cleaning or renewal of filters is necessary at about 3-monthly intervals, the time varying according to _______.
A.location on the ship
B.working instruction
C. the weather
D. ship sailing area When the union purchase derrick is operated,one derrick is positioned over the quayside and the other almost vertically over the ________
A.dock
B. cargo hold
C. pedestal
D.machinery space
__________are used sacrificially to protect heat exchanger headers, or even the ship’s hull itself .
A.Copper rods
B. Zinc rods
C. Carbon rods
D. Magnet rods
In sewage treatment, the term maceration’refer to the process of ________
A. breaking up solid matter into fine particles
B. precipitating non-decomposed waste in a collection tank
C. chemically adjusting the sewage PH to 7.0
D.eliminating bacterium bacterium coli from the sewage
A circuit breaker is ________
A.a distribution device
B. A lighting equipment
C. The indicating instrument
D. An isolating switch
In the safety system, a double check valve with a common spring ensures that the _______always operates regardless of which of the oil lines is the pressure side.
A.check valve
B. Solenoid valve
C. relief valve
D. Pressure regulating valve. The average pressure exerted on a piston during each power stroke is termed_________.
A. indicated horsepower
B. mean effective pressure
C. exhausted back pressure
https://www.360docs.net/doc/2e13912002.html,pression pressure
Which statement regarding garbage disposal is correct?
A.Records for ground garbage disposal are not requires when disposal into the sea occurs more than 25 miles offshore.
B.Discharging or transfer of garbage while in port to a shore facility must be recorded
C.Maintaining records for the incineration of garbage aboard ship is not required.
D.The recording of garbage disposal should include the approximate weather.
After the order “________” is given, the air system is shut down, the turning gear put in.
A.Finished With Engine
B. Stop the Engine
C. Stand-by Engine
D. Slow-down Engine
Damage repairs are necessary for a ship with the result of collision, grounding and ________.
A.blackout
B. minor fire
C. flooding
D. main generator failure
A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oil. Another function is to ________
A.act as a shock absorber
B. maintain the stored oil under pressure
C. act as a base or foundation for the power unit
D. eliminant pressure surges in the system
In the event of a small bunker oil spill on deck occurring while bunkering, you should _________.
A.wash down the area immediately with a fire hose
B.wash down the area with kerosene
C. cover the area with absorbent material
C.cover the area with foam
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
When starting a fuel limiter automatically limits the movement of te governor regulating shaft and thereby the _____of fuel which can be supplied to the engine.
A. amount
B. quality
C. appropriate temperature
D. appropriate viscosity
For crash maneuvers the level is moved from one extreme to the other, the sequence is _______
A. braking, starting and reaching critical speed
B. braking, reaching full speed (ahead or astern) and stopping
C. stopping oil supply, braking and reaching full speed (ahead or astern)
D. braking, starting and reaching full speed (ahead or astern)
Diesel engine mufflers or silencers reduce the engine exhaust noise by __________.
A. passing the exhaust through long head pipes
B. diffusing the exhaust vibrations through activated carbon baffles
C. increasing the exhaust gas velocity
D. reducing the exhaust gas velocity
The port state control officer may witness a fire drill carried out by the crew assigned to these duties on the ____.
A. Navigation Log Book
B. Engine Room Log Book
C. Oil Record Book
D. Muster List
In ________the control action is independent of the output.
A. a closed loop control system
B. an open loop control system
C. a boiler control system
D. a steering gear control system
Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?
A. The expansion tank should be topped off.
B. The thermostatic water regulating valves should be manually opened.
C. The fuel filters should be changed.
D. The engine should be turned over slowly with the indicator cocks open.
A vessel is required to carry an Oil Record Book PartⅠto log entries in the book regarding the __.
A. discharge of ballast or cleaning water from fuel tanks
B. sounding levels of all fuel tanks on a daily basis
C. grade and specific gravity of all fuel oil carried
D. fuel consumption rates on a weekly basis
The construction of watertube boiler, which use small-diameter tubes and have a small steam drum, enables the generation or generation of steam at high temperature and pressures. The weight of the boiler is much less than an equivalent firetube boiler and the steam raising process is much quicker. Design arrangements are flexible, efficiency is high and the feed water has a good natural circulation. These are some of the many reasons why the watertube boiler has replaced the firetube boiler as the major steam producer.
A. Early watertube boilers used a single drum, Headers were connected to the drum by short, bent pipes with straight tubes between the headers. The hot gases from the furnace passed over the tubes, often in a single pass.
A later development was the bent tube design, This boiler has two drums, an integral furnace and is often referred to as the “D” type because of its shape. The furnace is at the side of the twi drums and is surrounded on all sides by walls of tubes. These waterwall tubes are connected either to upper and lower headers or a lower header and the steam drum. Upper headers are connected by a Return tubes to the steam drum. Between the steam drum and the smaller water drum below, large numbers of smaller-diameter generating tubes are fitted.
(1)Which is not the reasons why the watertube boiler has replaced the firetube as the major
procedure.
A. the steam raising process is much quicker
B. efficiency is high
C. low water quality demand
D. the feedwater has a good natural circulation
(2)Early watertube boilers used a single drum . Headers were connected to the______by short, bent pipes with straight tubes between the headers.
A. Furnace
B. Economizer
C. Drum
D. Superheater
(3)What is located at the side of the two drums and is surrounded on all sides by walls of tubes?
A. Furnace
B. Economizer
C. Drum
D. Superheater
(4)Between the steam drum and the smaller water drum below , large numbers of ______ are fitted .
A. Smaller-diameter generating tubes
B. Lower headers
C. Steam drum
D. Upper header
We should ____ before the operation of ship generator’s paralleling off.
A. transfer the load
B. restart the generator
C. cut off the power supply
D. increase the load
The _____ is developed in response to the perceived threats to ships and port facilities in the wake of the 9/11 attacks in the United States.
A. ISM Code
B. SMS
C. ISPS Code
D. SOLAS, 1974
Which one is NOT the ’ for a more detailed inspection?
A. no operation procedures for the oil separators
B. engine log book missing
C. the master and the chief engineer are unable to communicate effectively
D. absence of an up-date muster list
When during separation solids and water accumulate in the solids holding space, the liquid seal is displaced to the bowl _____.
A. interface
B. brim
C. periphery
D. centre
_____ must not be racked out to the isolated position whilst on load,as this action constitutes a serious fire hazard.
A. Circuit breakers
B. light switches
C. control levers
D. cutoff switches
Which of the following must be eliminated to prevent accidents?
A. Unsafe actions
B. Orderliness
C. Frequent inspections
D. Good work habit/practices
The cetane number of a diesel fuel oil indicates its _____.
A. viscosity
B. acid content
C. heating value
D. ignition quality
To maintain the design discharge pressure of a centrifugal pump,the clearance the _____.
A. impeller and lantern ring is critical
B. impeller and casing wearing rings is critical
C. packing box and packing gland is critical
D. gland seal and packing gland is critical
The main objective of the SOLAS Convention is ______.
A. to provide a solution of lowering pollution at sea
B. to specify minimum standards for the member composing the watch at sea
C. to specify minimum standards for ships considering their safety
D. to tell the company hoe to go about running their business
The most suitable pump for oily water separator feed duties is_________
A. a reciprocating pump
B. a vane pump
C. a centrifugal pump
D. a triple screw pump
Before stopping he oil purifier, you should _____firstly.
A. cut off the power
B.shut off the oil inlet
C. open guide water valve
D. cose oil outlet valve
Which of the actions listed should be taken first to control an oil fire in a fuel oil tank?
A. Commence draining that tank as quickly as possible.
B. Seal off all vents to that tank.
C. Activate the CO?system to that tank
D. Shut off the steam heating coils.
Ring groove inserts are occasionally used on aluminum alloy pistons to _________.
A. reduce the ring groove wear rate
B. seal against crankcase vapors
C. lessen the wear on aluminum parts of the cylinder
D. allow for the greater expansion rate of aluminum
At every dry-docking, propellers should be carefully examined and the slightest defect at once rectified. Similarly, any unusual vibration or noise whilst at sea should be investigated immediately and, if the cause cannot be found inboard, then the first opportunity must be taken of an under-water inspection. The expert examination and repair of propellers is a service provided by the leading manufacturers. Whenever possible, use should be made of this service because, first, it is not always easy to detect slight damage and, secondly, inexpert work can quite easily cause irreparable harm. Cracks formed at or near blade edges, no matter how small, are potentially dangerous. If a crack should be found close to the boss(within 0.45 of the propeller radius) the makers should be consulted as any repair in this region involving heating can leave very high residual stresses which can only be removed by annealing the complete propeller. Small cracks can be temporarily stopped from spreading by drilling a hole of at least 1 mm in diameter at the extremity of the crack. The hole should be plugged to avoid any risk of cavitation.
(1) Which of the following statements is true?
A. If cracks formed near blade edges are very small, no care should be taken.
B. Only by annealing the complete propeller can the high residual stresses be removed.
C. Small cracks can be permanently stopped from spreading by drilling a hole.
D. The hole should be drilled at the middle of the crack.
(2) Why should the service provided by the leading manufacturers be used wherever possible?
A. Only because the service is free of charge.
B. Only because it is not easy to detect slight damage.
C. Only because inexpert work can quite easily cause irreparable harm.
D. Because it is difficult to find slight damage and inexpert work can result in irreparable harm.
(3) An under-water inspection should be taken _____.
A. whenever any unusual vibration occurs
B. whenever any abnormal noise occurs
C. whenever the cause for any unusual vibration or noise while at sea cannot be found inboard
D. whenever every dry docking is carried out
(4) If a crack should be found near the boss (within 0.45 of the propeller radius), which action should be taken first?
A. repairing this region
B. annealing the complete propeller
C. consulting the makers
D. drilling a hole with diameter less than 1 mm
Which of the listed pumps id NOT a positive displacement pump?
A. centrifugal pump
B. Reciprocating pump
C. Gear pump
D. Rotary pump
The burning of fuel oil in a diesel engine having a high sodium content, will cause _______
A. Corrosion and grooving of exhaust valves
B. Corrosion and gumming of the fuel injection pump
C. Salt deposits in the exhaust manifold
D. Slag deposits in the fuel injection equipment
When accumulated carbon at the air inlet ports of a two-stroke/cycle diesel diesel engine is being removed, you should take care to avoid carbon particles_____
A. entering the cylinder
B. becoming lodged under the intake valves
C. entering the jacket water
D. entering lube oil
第47期轮机英语
47期轮机英语考试题目 一单项选择题 A1.The___ engine is used for alternators and some times for main propulsion provide a propeller of between 90 to 120 rpm. A.four-stroke B.two-stroke. C.slow speed D.reversible B2.The abbreviation”MIP”stands for____, A.middle indicating pressure B.mean indicated pressure C.mean pitch D.middle indicated power D3.The cetane number of a diesel fuel oil indicates its____. A.viscosity B.acid content C.heating value D.ignition quality C4.In a two-stroke engine the camshaft rotates at___the enging rotational speed. A.half B.twice C.the same speed as D.four times D5.A diesel enging is similar to a gasoline engine except that the former has no ____. A.cross-head B.cylinder C.connecting rod D.spark plug C6.It is easier to replace a dry cylinder liner than a wet one because____. A.of the thin wall thickedss B.honing makes it easier to maintain the desired oil film C.water seals are not required D.it fits more loosely due to a decrease in heat transfer through the composite wall D7.A main bearing consists of two shells which are secured by means of studs and____. A.tie rods B.though bolts C.lead wires D.bearing caps C8.However fast or slow the combustion rate,it is still a____between carbon,hydrogen,sulph and oxygen that releases heat. A.physical deformation B.state exchange C.chemical reaction D.coalescence A9.During the fuel injection period,fuel pressure must exceed cylinder gas pressure to____. A.ensure penetration and distribution of the fuel in the combustion chamber B.ensure the needle valves is flushed clean duringeach injection C.prevent combustion gas blowback into the open needle valve Dprevent reflected pressure waves when the neddle valve close. B10.In a diesel engine lube oil system ,which of the following parts should be lubricated first? A.Camshaft bearings B.Main bearings C.Piston crowns D.Cylinder walls B11.In a diesel engine closed freshwater cooling system,the amount of coolant flowing through the heat exchanger is controlled by the _____, A.suction pressure regulator B.thermostatic bypass valve C.sea water temperature D.water level in the expansion tank
轮机大管轮英语真题48期
中华人民共和国海事局 2009年第5期海船船员适任证书全国统考试题(总第48期) 科目：轮机英语试卷代号：803 适用对象：无限、近洋航区3000KW及以上船舶大管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至82题，每题1分，第83题至94题，每题1.5分。 一、单项选择题： 1. The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is . A. they operate between 150 and 450 rpm B. they are connected to the propeller by gearing C. their smaller size and weight D. they can be connected directly to the propeller without gearing 2. The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by . A. large conical springs B. compressed air pressure C. hydraulic pressure D. exhaust gas pressure 3. One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the . A. governor sensitivity B. exhaust temperature C. fuel injection pressure D. speed of the cam shaft 4. The desirable properties or a marine fuel oil should inc lude . A. high flash point and high viscosity B. low flash point and high viscosity C. low heating value and high sulphur content D. high heating value and low sulphur content 5. As the plunger moves upwards in the barrel, injection will commence once the plunger bas the spill ports and the pressure builds up. A. opened up B. closed off C. lined up D. taken off 6. In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces . A. all of the oil used by the engine through a filter B. some of the oil used by the engine through a filter C. some of the oil used by the engine through a centrifuge D. all of the oil used by the engine through a centrifuge 7. Because the circulating water is in a closed loop, is installed to cater for expansion and contraction of the water at different conditions of operation. A. an expansion joint B. a drain tank C. a head tank D. a contraction tank 8. The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the . A. inlet nozzle ring B. turbine wheel blade C. diffuser passages D. inlet volute 9. is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve. A. An air receiver B. An operating valve C. An automatic valve D. An air distributor 10. Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as . A. actuation B. sensitivity C. compensation D. promptness 11. By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a . A. tachometer B. pyrometer C. dynamometer D. calorimeter 12. When the ship is going to enter into the harbor, ____. A. change from heavy fuel oil to diesel oil for main engine B. pumping out bilge water C. change sea chest from high level one to lower level one D. test emergency generator 13. If the jacket water temperature rises rapidly above normal in a diesel engine, you should first . A. place standby cooler in operation B. reduce engine toad C. check thermostatic valve D. clean sea water strainer 14. Air cocks, usually positioned at the in a circulating system, is used to get rid of the air in the system. A. bending joint B. expansion tank C. weld D. the highest point 15. Which of the following conditions could contribute to the cracking of a diesel engine cylinder head? A. Leaking seal ring B. Insufficient heat transfer from the exhaust valves C. Blocked cooling water passages to the head D. Excessive scavenging air provided to the engine 16. of an engine crankshaft can be detected by measuring deflections of' crank webs for each unit of the engine. A. Misalignment B. Length C. Strength D. Stresses 17. can be a direct cause of faulty operation of diesel engine fuel injection nozzles. A. Excessive fuel nozzle holder cooling B. Sediment in the fuel supply C. Distortion of the fuel spray pattern D. Improper atomization of the fuel 18. When fuel is injected late into a diesel engine cylinder . A. the exhaust will be clear B. fuel consumption will be low C. all the fuel will be burned at top dead center D. fuel consumption will be high 19. A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result m the need to adjust the . A. pilot valve opening B. compensating needle valve C. compensating spring tension D. accumulator spring tension 20. Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system? A. Baffle plates that have been bent during prior removal. B. Leaks m the cooler tube nest. C. Operating the engine while maintaining a high sea water outlet temperature. D. A punctured sea water strainer supplying cooling water to the heat exchanger. 21. If the scavenge fire is of a more major nature, if there is a risk of the fire extending or if the scavenge trunk is adjacent to the crankcase with risk of a hot spot developing it sometimes becomes necessary to the engine. A. stop B. start C. speed up D. slow down 22. In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?
三管轮轮机英语大证考试真题41期
中华人民共和国海事局 2006年第3期海船船员适任证书全国统考试题(总第41期) 科目：轮机英语试卷代号：805 适用对象：无限、近洋航区3000KW及以上船舶二/三管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题, 每题10分。 一、单项选择题 1. A diesel engine is similar to a gasoline engine except that the former has no ______. A. cross-head B. spark plug C. connecting rod D. cylinder 2. A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a ______. A. slow-speed diesel B. medium-speed diesel C. high-speed diesel D. constant-speed diesel 3.Which of the diesel engine components listed increases air density and helps to improve engine operating efficiency? A. Impeller B. Compressor C. After-cooler D. Exhaust diffuser 4.For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four- stroke/cycle diesel engine because ______. A. it has a longer power stroke B. more air gets into the cylinder each stroke C. it develops twice as many power strokes at the same speed D. higher combustion pressure is developed 5.The intake valves in a diesel engine are reseated by ______. A. cam followers B. push rods C. combustion gases D. valve springs 6.According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and ______. A. the pulse-phase system B. the pulse Doppler system C. the pulse system D. the pulse interval system 7.An over-speed safety device is usually fitted to a generator engine for______in the event of over- speed. A. cutting power off the engine B. increasing the fuel pump setting C. braking the crankshaft D. stabilizing the ship speed 8.What preventative maintenance should be done frequently to diesel engine starting air receivers? A. Drain the accumulated moisture. B. Test the relief valves. C. Watch the temperature to prevent fluctuations in pressure. D. Clean the interior to remove oil and foreign matter. 9.Immediately after any diesel engine is started, the engineer should check the ______. A. crankcase pressure B. lube oil pressure C. seawater pressure D. exhaust temperature 10. A controllable pitch propeller on a diesel driven vessel eliminates the need for ______. A. friction clutches B. disconnect clutches C. reversing gears D. reduction gears 11.In motor ship, ______is often used to recover some of the heat carried in the exhaust gases from the main engine. A. an diesel oil heater B. a waste heat boiler C. a fresh water generator D. a donkey boiler 12.An exhaust gas bypass is installed on a waste heat boiler in order to ______. A. bypass exhaust gas at high loads to prevent excessive back pressure B. bypass a portion of the exhaust gas at peak loads for better efficiency C. recycle exhaust gas to the turbocharger D. minimize moisture condensation in the boiler gas passages at low loads 13.Prior to lighting off a cold automatically fired auxiliary boiler, you should ______. A. check and regulate the water level B. close the air cock once fires are lit C. blow down the gage glass D. assure protective steam flow 14.Flame failure in an automatically fired auxiliary boiler can mostly result from a/an ______. A. incorrect electrode setting B. incorrect nozzle position C. clogged fuel nozzle D. broken high tension lead 15.Waterside scale in a fire-tube boiler may cause ______. A. increased heat transfer B. fireside erosion C. high steam demand D. overheated tubes 16.Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? I. Its discharge is continuous; II. It has no internal valves; III. Upon accidental closing of discharge valve, excessive pressure will not build up A. I, II B. II, III C. I, II, III D. II only 17.Why are removable sleeves installed on centrifugal pump shafts? A. They make it easier to replace the pump shaft packing. B. They can be economically replaced as they wear out. C. They can be removed when it is necessary to lighten the weight of the pump. D. They increase the strength of the shaft. 18.If one of the bilge system manifold valves does not properly seat, the ______. A. bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied B. bilge system will lose vacuum and prevent the other bilges from being pumped out C. bilge well aft connected to that valve will siphon(虹吸) its contents to the forward bilge wells D. discharge pressure will be too high. 19.Which of the listed statements is correct concerning the starting of centrifugal pumps? A. They should always be started with the discharge valve closed. B. They should always be started with the discharge valve opened. C. A priming pump is always required to flood the impeller suction. D. They should always be started with the sealing line valves closed. 20.The simplest method to use for determining if a centrifugal pump is operating as designed, is to ______. A. closely observe the pump discharge temperature B. close off the discharge valve, and watch for a rise in pressure C. momentarily close off the suction valve, and watch for a rise in pressure D. use a clamp on ammeter and compare the readings to past records
第32期轮机英语考试题
中华人民共和国海事局 2003年第3期海船船员适任证书全国统考试题(总第32期) 科目：轮机英语试卷代号：801 适用对象：无限、近洋航区3000KW及以上船舶轮机长 （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68题，每题1分，第69题至76题，每题1．5分,第77题至78题, 每题10分。 一、单项选择题： 1．______ is fully floating in both connecting rod small end and the piston skirt．A． The piston rod B． The cross head pin C． The gudgeon pin D． The crank-pin 2．When we say that two objects have relative motion, we mean ______． A． the distance between them remains the same B． the distance between them is changing C． the position between them is not changing D． their positions to the earth remain the same 3．The ______ or balance tank collects the re-circulated fuel oil． A． buffer B． sump C． bilge D． overflowing 4．What is the harmful effect of sulfur in a fuel? A． It causes excessive smoking and soot at low firing rates． B． It doesn't readily burn when combined with oxygen． C． It clogs fuel oil strainers more often． D． It forms a corrosive acid when mixed with water or water vapor． 5．The main bearing metal is a lining ______． A． inside the bearing B． outside the bearing C． covering the crankshaft D． none of the above 6．______ neutralizes the acid conditions and ______ cleanses the rings and grooves．A． The detergency/the alkalinity B． The alkalinity/the detergency C． The inhabitant/ the water D． The additives/the distilled water 7．In a central cooling system, used in some modern ships, sea water is supplied to cool ______ which will circulate to other individual cooler, greatly reducing the corrosion problems． A． fresh water B． sea water C． cooling oil D． emulsion 8．An electrically driven automatically operating auxiliary blower is provided for slow speed and ______ of a low speed diesel engine． A． manoeuvring operations B． bad combustion C． cooling D． mooring trial 9．The average exhaust temperature of a two-stroke/cycle diesel engine with a turbine-driven supercharger is lower than a similar four-stroke/cycle diesel engine at equal loads because _______． A． two-stroke/cycle diesel engines have a higher M．E．P． than four-stroke /cycle diesel engines B． four-stroke/cycle diesel engine exhaust is cooled by scavenging air C． two-stroke/cycle diesel engines have a lower M．E．P． than four-stroke/cycle diesel engines D． the opening of the two-stroke/cycle diesel exhaust ports or valves occurs much later than in four-stroke/cycle diesel engines 10．Engine speeds at which resonance can occur are termed ______． A． maximum speeds B． full speeds C． sea speeds D． critical speeds 11．When the propeller blades are integral with the hub, the propeller is called a______．A． built up propeller B． solid propeller C． controllable pitch propeller D． suction back propeller 12．The timing of the injection can be altered by raising or lowering the pump ______in relation to the cam． A． needle valve B． cylinder C． piston D． arm rod 13．______ are commonly used in mechanical-hydraulic governor to sense engine speeds．A． Bulbs B． Bulks C． Flyweights D． Flywheels 14．When ______is operated, a supply of pilot air enables the remote valve to open．A． the distributor B． the air start lever C． the turning gear D． the cylinder air start valve 15．A reduction in load on a diesel engine results in ______ of speed of the crankshaft．A． a reduction B． an increase C． an outing D． a downwards 16．All of the diesel engine cylinder firing pressures are normal, yet all of the exhaust temperatures are low． Which of the following situations is responsible for this condition? A． Excessively early injection timing B． Combustion knock． C． Leaking piston rings．D． Light load． 17．The mechanical efficiency of an engine is always less than 100% _____ losses occurring in the form of friction. A. because B. since C. due to D. owing 18．In reducing engine speed to an efficient propeller speed by the use of reduction gears, ______．A． speed and torque are both reduced B． speed is reduced and torque remains unchanged C． speed is reduced and torque is increased D． speed is sometimes unchanged while torque is increased 19．The ab breviation “TDS” about the potable water probably means ______． A． total dissolved solids B． temperature of distillation of sea water C． total dissolved sodium D． total delivery system 20．Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid ______ pressure． A． depending on B． in relative to C． regardless of D． because of
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