轮机英语三管轮试题 造水机
Lesson19
1735. _____ is the production of pure water from sea water by evaporation and re-condensing.
A. Evaporation
B. Circulation
C. Condensation
D. Distillation
1736. When a vacuum boiling evaporator works, the hot jacket water will pass over the tube stack and_____ the sea water passing through the tubes.
A. dispose
B. dissolve
C. heat
D. dissipates
1737. With a vacuum boiling evaporator, the remainder of sea water fed to the evaporator is pumped out by_____.
A. a brine pump
B. an air ejector
C. a feed pump
D. distillate pump 1738. In a vacuum boiling evaporator, the fresh water generated is pumped out by_____.
A. a brine pump
B. an air ejector
C. a feed water pump
D. a condensate pump
1739. When distilling sea water the cooling water discharging from the distiller is fed back to evaporator as feed water_____.
A. to decrease scale formation
B. for better cooling effect
C. for more economical purpose
D. to raise vacuum
1740. When distilling salt water the cooling water discharging from the distiller is fed back to evaporator as feed water_____.
A. to cut down the amount of cooling water needed
B. to prevent an excess amount of cooling water from being discharged to the bilges
C. to supply hot water to the evaporator for more economical operation
D. None of the above is tree.
1741. The process during which liquid containing a reasonable amount of sensible heat at a particular pressure immediately changes into steam after admitted to a chamber at a lower pressure is called_____.
A. boiling off
B. flash evaporation
C. condensation
D. none of the above 1742. In the process of_____, liquid changes into gas.
A. evaporation
B. frosting
C. condensing
D. compressing 1743. Which of the following is NOT on the list items to be recorded in Oil Record Book Part I (machinery space operation)?
A. Accidental discharge of oil.
B. Disposal of oil residues.
C. Quantity of water produced by F. W. G.
D. Discharge of dirty ballast or cleaning water from fuel oil tanks.
1744. 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 alkaline
C. no salty
D. slightly bitter 1745. _____ provides the head or pressure to supply the domestic water where required.
A. The compressed air
B. The compressing air
C. The transfer pump
D. The head tank
1746. _____ is used for washing and drinking.
A. The ballast system
B. The salt water system
C. The bilge system
D. The domestic system
1747. Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure_____ the saturation temperature.
A. the more
B. the higher
C. the lower
D. the highest
1748. We use_____ to distill fresh water from sea water.
A. engine
B. sea water pump
C. cylinder cooler
D. fresh water generator
1749. Because of the reduced_____ in the vacuum boiling evaporator, some of the sea water boils as it flows through the tubes.
A. temperature
B. water level
C. pressure
D. rate of flow
1750. The fresh water generator produces fresh water_____.
A. by cooling sea water
B. by heating sea water
C. by evaporation of sea water
D. by purifying sea water
1751. Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl_____.
A. bottom
B. top
C. center
D. periphery
1752. The designed capacity is 25 tons a day, but the fresh water generator can only_____ 22 tons at present.
A. consume
B. distill
C. run
D. operate 1753. More than one stage of evaporation can take place by admitting the sea water into chambers with progressively_____ pressure in the flash evaporator.
A. lower
B. higher
C. the lower
D. the higher 1754. Because of the reduced_____ in the distillation system, some of the sea water boils as it flows through the tubes of the evaporator.
A. pressure
B. temperature
C. density
D. volume 1755. In_____, hot diesel engine jacket water passes over the stack and heats the sea water passing through the tubes.
A. a flash generator
B. a flash evaporator
C. a vacuum boiling evaporator
D. a boiler
1756. Which of the following statements is true concerning any evaporator?
A. High conductivity of the distillate indicates distillate salinity is excessive.
B. Increasing the absolute pressure of the shell will increase the distiller's capacity.
C. Mesh separators are used in evaporators to filter the distillate.
D. Reducing the brine density will reduce the heat lost overboard.
1757. The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as_____.
A. dehydration
B. condensation
C. evaporation
D. dissolution
1758. When a flash-type evaporator is to be secured for an extended period of time, the entire unit should be drained, cleaned, and_____.
A. completely filled with saltwater
B. filled with de-scaling compound
C. tightly closed to exclude air
D. vented to the atmosphere
1759. Which of the following descriptions best identifies the operating principal of a flash-type evaporator?
A. Sea water is heated to boiling temperature while under a vacuum.
B. Sea water is passed over heated plates in a thin film.
C. Heated sea water is injected into a vacuum chamber.
D. Sea water is forced through a heated eductor.
1760. Which of the listed problems could produce a high absolute pressure within a flash type evaporator?
A. Production of high salinity distillate .
B. Seawater feed temperature below 165o
C.
C. A leak in the first stage demister .
D. A cracked distillate pump vent line.
1761. Distilled water from an evaporator may be discharged into a potable water(饮用水)tank _____.
A. through a detachable hose connection
B. after passing through an activated charcoal filter
C. after chemical analysis shows it is fit for consumption
D. through a solenoid operated three-way valve
1762. Which of the following statements is correct relative to distillation plant operation?
A. Distillation is the process of boiling seawater to produce vapor which is condensed into fresh water.
B. Evaporation is the second part of the distillation process where brine is removed.
C. Brine is the result of condensed sea water vapor.
D. Distillate is the product resulting from the evaporation of fresh water vapor. 1763. Brine density in a distilling plant is measured with a/an_____.
A. psychrometer
B. salinometer
C. anemometer
D. sphygmomanometer
1764. Tube leaks in the distillate cooler of a two stage flash evaporator will result in_____.
A. loss of second stage vacuum
B. contamination of the distillate
C. lower feed inlet temperature
D. contamination of the second stage condenser
1765. Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?
A. The colder seawater passing through the condenser tube bundles of the various stages increases evaporator vacuum.
B. The amount of heated feed water discharged from the feed water heater after condenser is increased.
C. Fewer non-condensable gases are created by the flow of colder seawater.
D. More seawater is allowed to pass through the flint stage overflow weir.
1766. One distinct advantage of flash type evaporators, as compared to most other evaporators, is that in a flash evaporator_____.
A. high temperature distillate can be re- circulated to induce additional flashing
B. scale formation is not a severe problem
C. cold shocking is more effective in removing scale
D. water purity is greatly increased at high capacity
1767. Less scale formation occurs in a flash evaporator than in a submerged tube evaporator because_____.
A. the distillate produced has greater purity
B. no boiling occurs on heat transfer surfaces
C. evaporation occurs at a higher rate
D. the incoming feed is at a higher temperature
1768. The primary reason low pressure evaporators produce distillate more efficiently, and with less scale formation, than high pressure evaporators is_____.
A. evaporation is accomplished in a vacuum
B. due to the higher temperature of the incoming feed
C. due to the latent heat of evaporation principle
D. evaporation in a submerged medium produces more distillate
1769. A vacuum is initially created in a flash type distilling plant by_____.
A. the flashing of the feed water
B. the condensation of the saltwater feed
C. air ejectors, eductors, or a separate vacuum pump
D. condensation of the distillate
1770. Scale accumulation on evaporator heat exchange surfaces_____.
A. increases brine density
B. increases distillate salinity
C. reduces metal corrosion
D. reduces heat transfer
1771. Excessive scale formation in a distilling plant may result from_____.
A. poor distillate quality
B. reduced evaporator capacity
C. low brine concentration
D. improper vacuum regulation
1772. Which of the listed conditions will cause the feed water, that has not flashed to vapor in the first-stage of a flash evaporator, to flow into the second-stage?
A. Gravity siphon effect.
B. Higher vacuum in the second-stage.
C. Difference in brine density between first and second stages.
D. lower pressure in first-stage.
1773. The vacuum maintained in the salt water feed heater shell of a flash-type evaporator is generally accomplished by_____.
A. a separate air ejector unit
B. a direct unimpeded connection between second stage and salt water feed heater
C. either by vacuum drag or an external line from the first stage via a fixed orifice
D. the fixed orifice provided in the steam supply line
1774. 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. 1775. On which of the following heated surfaces of a flash type evaporator would you be more likely to find soft scale formation?
A. Feed-water heater internal tube surfaces.
B. Internal distillate cooler tubes.
C. Flash chamber vertical surfaces.
D. Distilling condenser tubes. 1776. Which of the conditions listed represents the greatest effect of excess frost accumulation on the evaporator coils?
A. Keeps the refrigerated space cooler.
B. Reduces the efficiency of the plant.
C. Takes the load off the compressor.
D. Has no affect on the system.
1777. Which statement concerning the collection of fresh water is FALSE?
A. Fresh water may be obtained from fish.
B. lifeboat covers or canopies should be washed with rain before drinking water is
collected.
C. Fresh water may be collected from condensation inside the life-raft.
D. Freshwater cannot be produced from standing seawater.
1778. Seawater may be used for drinking water_____.
A. at a maximum rate 'of two ounces per day
B. after mixing with an equal quantity of fresh water
C. if gather during or immediately after a hard rain
D. under no circumstance
1779. Distilled water is now largely used on board, this may be corrosive (due to presence of dissolves CO2) and_____ to the taste.
A. flat
B. slat
C. sweet
D. acid 1780.. A flash-type evaporator discharges heated seawater into a chamber that is maintained at a pressure _____________ than the vapor pressure of the entering heated seawater, and subsequently the flashed water vapor thereby produced.
A. lower condensing
B. higher cooling
C. lower cooling
D. higher condensing
1781. The design of ___________for a flash type evaporator is of critical importance because it must provide an optimum feed water spray pattern that facilitates the flashing process, and it must also maintain a pressure differential between successive stages.
A. condenser
B. flashing device
C. lashing device
D. vacuum pump 1782. Which one of the following might not be employed to create vacuum for flash type evaporator__________.
A. high-pressure steam-driven air-ejector
B. motor-driven vacuum pump
C. water-motivated air educator
D. centrifuge pump
1783. The flash-evaporator is different with the submerged-tube evaporator in that for the former_________.
A. Water is heated into vapor on heating surfaces
B. Water is vaporized by pressure difference
C. There are no heating-transfer surfaces
D. There are more heating-transfer surfaces
1784. For a flash type evaporator, the seawater heater will have to maintain a _____enough temperature to minimize scale formation.
A. lower
B. higher
C. low
D. high
1785. For a flash type evaporator, a demister is located ______the condenser.
A. after
B. before
C. inside
D. outside
1786. The efficiency and output capacity of a low pressure distilling plant will be reduced if the last effect shell ______.
A pressure does not fluctuate rapidly
B pressure remains steady and unchanged
C brine density does not exceed 1.5
D brine density is too low
1787. The heated feed water entering any flash chamber of a flash-type evaporator will ______.
A vaporize, with the unflashed water remaining at the temperature at which it entered the flash chamber
B vaporize, with the unflashed water equalizing to the saturation conditions existing in the flash chamber
C vaporize, with the remaining water at a temperature greater than it entered the flash chamber
D boil, allowing steam bubbles to rise through the brine at the bottom of the flash chamber
1788. The three basic parts of any eductor are the nozzle, the suction chamber, and the _______.
A injector
B compressor
C diffuser
D siphon
1789. _______ is based upon the biological process of osmosis, which allows fluids to pass through a semi –permeable membrane.
A. Flash
B. Reverse osmosis
C. Boiling off
D. Distillation
1790. The desalination of water by ______is a membrane separation process in which the water from a pressurized saline solution (seawater) is forced through a synthetic semi-permeable membrane leaving its salts behind (dissolved solids)
A. distillation
B. flash
C. reverse osmosis
D. boiling off
1791. The function of the _______is to convert seawater into fresh water by vacuum distillation, for the supply of high quality fresh water for domestic and process utilization.
A. oily water separator
B. incinerator
C. fresh water generator
D. centrifuges
1792. The efficiency of a flash type evaporator can be increased by ________
A. lowering brine discharge density
B. decreasing the absolute pressure of each stage
C. increasing the saltwater feed heater temperature
D. increasing the pressure at the spray pipe
1793. The second stage feed water temperature and shell absolute pressure in a multistage, flash type, distilling plant is ________
A. higher than the first stage feed water temperature and absolute shell pressure
B. lower than the first stage feed water temperature and absolute shell pressure
C. the same as the first stage feed water temperature and absolute shell pressure
D. not related to the feed water temperature and absolute shell pressure
1794. On a multistage flash type evaporator, the flash chamber is ________
A. combined as part of the salt water feed heater
B. the open area above the brine levels in the first and second stages
C. combined as part of the distillate cooler
D. another term used to describe the vapor feed heater
1795. Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?
A. hydrochloric acid
B. chlorine
C. sulfuric acid
D. zinc chromate 1796. Drops of sea water removed by demister _______in the fresh water generator.
A. fall due to gravity in to the brine sump
B. fall due to gravity in to the evaporation section
C. are removed by fresh water generator
D. are removed by sea water generator
1797. The hot water in let and outlet valves in the fresh water generator should be open ____during the starting process.
A. when there is minimum of 90% vacuum
B. before starting the ejector pump
C. when there is a minimum of 30% vacuum
D. after stop the ejector pump
1798. The combined brine/air ejector in fresh water generator is supplied by _______creates a vacuum in the system in order to lower the evaporation temperature of the feed water.
A. the fresh water pump
B. the feeding pump
C. the compressed air installation
D. the separate vacuum pump 1799. The air valve installed on the upper part of the fresh water generator________
A. should be open during vacuum creation procedure
B. should be open after stopping the plants
C. should remain closed all the time
D. should remain open all the time
1800. The combined brine/air ejector creates a vacuum in fresh water generator in order to_______
A. increase the evaporation temperature of the feed-water
B. decrease the evaporation temperature of the feed-water
C. decrease the temperature of the feed-water
D. increase the evaporation temperature of the feed-water
1801. The ejector pump used in the fresh water generator will_______
A. discharge brine over water
B. supply condenser only
C. feed the evaporator
D. circulate seawater between condenser and evaporator
1802. The fresh water generator with a vacuum of _____allowing the brine to evaporate at a temperature of 40-50o C .
A. 60-70%
B. 40-50%
C.90-95%
D.20-30%
1803. The vapour generated in the evaporator process through ______ in the fresh water generator
A. the condenser only
B. the condenser and demister
C. the demister only
D. combined brine/air ejector
1804. Having reached the boiling temperature, the feed water undergoes _____in the fresh water generator.
A. total evaporation
B. partial evaporation
C .partial condensation
D. total condensation
1805. The ____used in the fresh water generator extracts the produced fresh water from ten condenser and pumps the water to the fresh water tank.
A. distillate pump
B. ejector pump
C. combined brine/air ejector
D. salinometer
1806. The ______used in the fresh water generator is a single-stage centrifugal pump which supplies the condenser with sea water and the brine/air ejector with jet water as well as feedwater for evaporation.
A. distillate pump
B. feeding pump
C. combined brine/air ejector
D. salinometer
1807. Which of the following sequence is correct relative to distillation plant stopping procedures?
(Ⅰ)Open the air screw on the plant;(Ⅱ)stop the ejector pump;(Ⅲ)stop the freshwater pump;(Ⅳ)stop the hot water supply to the unit.
A. (Ⅲ), (Ⅱ), (Ⅰ),(Ⅳ)
B.(I)(III)(IV)(II)
C.(IV)(I)(III)(II)
D.(IV)(III)(II)(I)
1808. Which of the following sequence is correct relative to distillation plant starting procedures?
(I) close the air screw on the plant and allow the water to flow through the condenser; (II) start the freshwater /distillate pump; (III) supply hot water to the plant (IV) switch on the salinometer; (V) start the ejector pump and create a vacuum of at least 90%.
A. (Ⅲ), (Ⅱ), (Ⅰ),(Ⅳ),(V)
B.(I)(V)(III)(IV)(II)
C.(IV)(I)(III)(II) (V)
D.(V)(IV)(III)(II)(I)
1809. Early models of the flash-type evaporators used a separate shell-and tube heat exchanger as the air ejector condenser. More recent models use a combined air ejector condenser with the __________
A. distilling condenser
B. salt water feed heater
C. distillate cooler
D. flash chamber
1810. The demisters installed in a flash-type evaporator serve to _________
A. deaerate the first effect distillate
B. filter the condensed flash vapors
C. deaerate the first and second effect distillate
D. remove small water droplets entrained in the flashed vapor
1811. In the two stage flash distilling plant, which of the pumps listed is vented to the shell of the second stage in order to remove vapor from the pump suction?
A. Condenser circulating
B. Feed-water heater drain pump
C. Distillate pump
D. Air ejector condenser drain pump 1812. In a flash type evaporator, the brine overboard pump is vented directly to the _________
A. saltwater heater shell
B. the condensation of the saltwater feed
C. air ejectors, eductors, or a separate vacuum
D. condensation of the distillate
1813. One advantage of a flash distilling plant when compared to a submerged tube distiller is ____________
A. greater distillate purity through high temperature evaporation
B. cold shocking for scale removal is not required
C. less internal corrosion because of lower brine density
D. less feed-water is required for equal plant capacity
1814. Why will a two stage flash type distilling plant tend to operate more efficiently when operating in cold seawater?
A. The colder seawater passing through the condenser tube bundles(束)of the various stages increases evaporator vacuum.
B. The amount of heated feed water discharged from the feed water heater after condenser is increase
C. Fewer non-condensable gases are created by the flow of the colder seawater
D. More seawater is allowed to pass through the first stage overflow weir(溢洪堰)
1815. Under normal operating conditions, the highest temperature and pressure conditions existing in a flash-type evaporator will occur in the _________
A. first stage
B. second stage
C. distillate cooler
D. salt water feed water 1816. Condensate formed within the first-effect tube nest of a double-effect, low pressure evaporator, is removed by a ________________
A. series of baffles (挡板)
B. crossover (交叉) pipe
C. condensate separator
D. drain pump
第47期轮机英语
47期轮机英语考试题目 一单项选择题 A1.The___ engine is used for alternators and some times for main propulsion provide a propeller of between 90 to 120 rpm. A.four-stroke B.two-stroke. C.slow speed D.reversible B2.The abbreviation”MIP”stands for____, A.middle indicating pressure B.mean indicated pressure C.mean pitch D.middle indicated power D3.The cetane number of a diesel fuel oil indicates its____. A.viscosity B.acid content C.heating value D.ignition quality C4.In a two-stroke engine the camshaft rotates at___the enging rotational speed. A.half B.twice C.the same speed as D.four times D5.A diesel enging is similar to a gasoline engine except that the former has no ____. A.cross-head B.cylinder C.connecting rod D.spark plug C6.It is easier to replace a dry cylinder liner than a wet one because____. A.of the thin wall thickedss B.honing makes it easier to maintain the desired oil film C.water seals are not required D.it fits more loosely due to a decrease in heat transfer through the composite wall D7.A main bearing consists of two shells which are secured by means of studs and____. A.tie rods B.though bolts C.lead wires D.bearing caps C8.However fast or slow the combustion rate,it is still a____between carbon,hydrogen,sulph and oxygen that releases heat. A.physical deformation B.state exchange C.chemical reaction D.coalescence A9.During the fuel injection period,fuel pressure must exceed cylinder gas pressure to____. A.ensure penetration and distribution of the fuel in the combustion chamber B.ensure the needle valves is flushed clean duringeach injection C.prevent combustion gas blowback into the open needle valve Dprevent reflected pressure waves when the neddle valve close. B10.In a diesel engine lube oil system ,which of the following parts should be lubricated first? A.Camshaft bearings B.Main bearings C.Piston crowns D.Cylinder walls B11.In a diesel engine closed freshwater cooling system,the amount of coolant flowing through the heat exchanger is controlled by the _____, A.suction pressure regulator B.thermostatic bypass valve C.sea water temperature D.water level in the expansion tank
轮机大管轮英语真题48期
中华人民共和国海事局 2009年第5期海船船员适任证书全国统考试题(总第48期) 科目：轮机英语试卷代号：803 适用对象：无限、近洋航区3000KW及以上船舶大管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至82题，每题1分，第83题至94题，每题1.5分。 一、单项选择题： 1. The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is . A. they operate between 150 and 450 rpm B. they are connected to the propeller by gearing C. their smaller size and weight D. they can be connected directly to the propeller without gearing 2. The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by . A. large conical springs B. compressed air pressure C. hydraulic pressure D. exhaust gas pressure 3. One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the . A. governor sensitivity B. exhaust temperature C. fuel injection pressure D. speed of the cam shaft 4. The desirable properties or a marine fuel oil should inc lude . A. high flash point and high viscosity B. low flash point and high viscosity C. low heating value and high sulphur content D. high heating value and low sulphur content 5. As the plunger moves upwards in the barrel, injection will commence once the plunger bas the spill ports and the pressure builds up. A. opened up B. closed off C. lined up D. taken off 6. In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces . A. all of the oil used by the engine through a filter B. some of the oil used by the engine through a filter C. some of the oil used by the engine through a centrifuge D. all of the oil used by the engine through a centrifuge 7. Because the circulating water is in a closed loop, is installed to cater for expansion and contraction of the water at different conditions of operation. A. an expansion joint B. a drain tank C. a head tank D. a contraction tank 8. The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the . A. inlet nozzle ring B. turbine wheel blade C. diffuser passages D. inlet volute 9. is usually driven by the engine camshaft and supplies pilot air to the cylinder air start valve. A. An air receiver B. An operating valve C. An automatic valve D. An air distributor 10. Diesel engines driving alternators operating in parallel must maintain a set frequency regardless of load changes. The governor characteristic used to accomplish this is known as . A. actuation B. sensitivity C. compensation D. promptness 11. By comparing the exhaust gas temperature of each cylinder, the operator can determine if the load is balanced throughout the engine. The device most commonly used is a . A. tachometer B. pyrometer C. dynamometer D. calorimeter 12. When the ship is going to enter into the harbor, ____. A. change from heavy fuel oil to diesel oil for main engine B. pumping out bilge water C. change sea chest from high level one to lower level one D. test emergency generator 13. If the jacket water temperature rises rapidly above normal in a diesel engine, you should first . A. place standby cooler in operation B. reduce engine toad C. check thermostatic valve D. clean sea water strainer 14. Air cocks, usually positioned at the in a circulating system, is used to get rid of the air in the system. A. bending joint B. expansion tank C. weld D. the highest point 15. Which of the following conditions could contribute to the cracking of a diesel engine cylinder head? A. Leaking seal ring B. Insufficient heat transfer from the exhaust valves C. Blocked cooling water passages to the head D. Excessive scavenging air provided to the engine 16. of an engine crankshaft can be detected by measuring deflections of' crank webs for each unit of the engine. A. Misalignment B. Length C. Strength D. Stresses 17. can be a direct cause of faulty operation of diesel engine fuel injection nozzles. A. Excessive fuel nozzle holder cooling B. Sediment in the fuel supply C. Distortion of the fuel spray pattern D. Improper atomization of the fuel 18. When fuel is injected late into a diesel engine cylinder . A. the exhaust will be clear B. fuel consumption will be low C. all the fuel will be burned at top dead center D. fuel consumption will be high 19. A large change in ambient temperature, or using an oil of a viscosity different than the one recommended by the manufacturer in a mechanical hydraulic governor, will result m the need to adjust the . A. pilot valve opening B. compensating needle valve C. compensating spring tension D. accumulator spring tension 20. Which of the following factors tends to increase scale formation on the saltwater side of a heat exchanger used in a diesel engine cooling water system? A. Baffle plates that have been bent during prior removal. B. Leaks m the cooler tube nest. C. Operating the engine while maintaining a high sea water outlet temperature. D. A punctured sea water strainer supplying cooling water to the heat exchanger. 21. If the scavenge fire is of a more major nature, if there is a risk of the fire extending or if the scavenge trunk is adjacent to the crankcase with risk of a hot spot developing it sometimes becomes necessary to the engine. A. stop B. start C. speed up D. slow down 22. In an operating diesel engine, which of the following conditions is an indication of a leaking air starting valve?
三管轮轮机英语大证考试真题41期
中华人民共和国海事局 2006年第3期海船船员适任证书全国统考试题(总第41期) 科目：轮机英语试卷代号：805 适用对象：无限、近洋航区3000KW及以上船舶二/三管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题, 每题10分。 一、单项选择题 1. A diesel engine is similar to a gasoline engine except that the former has no ______. A. cross-head B. spark plug C. connecting rod D. cylinder 2. A diesel engine which is rated for normal operation at a crankshaft speed of 800 RPM, is commonly classed as a ______. A. slow-speed diesel B. medium-speed diesel C. high-speed diesel D. constant-speed diesel 3.Which of the diesel engine components listed increases air density and helps to improve engine operating efficiency? A. Impeller B. Compressor C. After-cooler D. Exhaust diffuser 4.For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four- stroke/cycle diesel engine because ______. A. it has a longer power stroke B. more air gets into the cylinder each stroke C. it develops twice as many power strokes at the same speed D. higher combustion pressure is developed 5.The intake valves in a diesel engine are reseated by ______. A. cam followers B. push rods C. combustion gases D. valve springs 6.According to the way the energy of the exhaust gases is utilized, pressure-charging can be divided into two main systems, namely, the constant-pressure system and ______. A. the pulse-phase system B. the pulse Doppler system C. the pulse system D. the pulse interval system 7.An over-speed safety device is usually fitted to a generator engine for______in the event of over- speed. A. cutting power off the engine B. increasing the fuel pump setting C. braking the crankshaft D. stabilizing the ship speed 8.What preventative maintenance should be done frequently to diesel engine starting air receivers? A. Drain the accumulated moisture. B. Test the relief valves. C. Watch the temperature to prevent fluctuations in pressure. D. Clean the interior to remove oil and foreign matter. 9.Immediately after any diesel engine is started, the engineer should check the ______. A. crankcase pressure B. lube oil pressure C. seawater pressure D. exhaust temperature 10. A controllable pitch propeller on a diesel driven vessel eliminates the need for ______. A. friction clutches B. disconnect clutches C. reversing gears D. reduction gears 11.In motor ship, ______is often used to recover some of the heat carried in the exhaust gases from the main engine. A. an diesel oil heater B. a waste heat boiler C. a fresh water generator D. a donkey boiler 12.An exhaust gas bypass is installed on a waste heat boiler in order to ______. A. bypass exhaust gas at high loads to prevent excessive back pressure B. bypass a portion of the exhaust gas at peak loads for better efficiency C. recycle exhaust gas to the turbocharger D. minimize moisture condensation in the boiler gas passages at low loads 13.Prior to lighting off a cold automatically fired auxiliary boiler, you should ______. A. check and regulate the water level B. close the air cock once fires are lit C. blow down the gage glass D. assure protective steam flow 14.Flame failure in an automatically fired auxiliary boiler can mostly result from a/an ______. A. incorrect electrode setting B. incorrect nozzle position C. clogged fuel nozzle D. broken high tension lead 15.Waterside scale in a fire-tube boiler may cause ______. A. increased heat transfer B. fireside erosion C. high steam demand D. overheated tubes 16.Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? I. Its discharge is continuous; II. It has no internal valves; III. Upon accidental closing of discharge valve, excessive pressure will not build up A. I, II B. II, III C. I, II, III D. II only 17.Why are removable sleeves installed on centrifugal pump shafts? A. They make it easier to replace the pump shaft packing. B. They can be economically replaced as they wear out. C. They can be removed when it is necessary to lighten the weight of the pump. D. They increase the strength of the shaft. 18.If one of the bilge system manifold valves does not properly seat, the ______. A. bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied B. bilge system will lose vacuum and prevent the other bilges from being pumped out C. bilge well aft connected to that valve will siphon(虹吸) its contents to the forward bilge wells D. discharge pressure will be too high. 19.Which of the listed statements is correct concerning the starting of centrifugal pumps? A. They should always be started with the discharge valve closed. B. They should always be started with the discharge valve opened. C. A priming pump is always required to flood the impeller suction. D. They should always be started with the sealing line valves closed. 20.The simplest method to use for determining if a centrifugal pump is operating as designed, is to ______. A. closely observe the pump discharge temperature B. close off the discharge valve, and watch for a rise in pressure C. momentarily close off the suction valve, and watch for a rise in pressure D. use a clamp on ammeter and compare the readings to past records
轮机英语历年真题43期
中华人民共和国海事局 2007年第2期海船船员适任证书全国统考试题(总第43期) 科目：轮机英语试卷代号：805 适用对象：无限、近洋航区3000KW及以上船舶二/三管轮 （本试卷卷面总分100分，及格分为70分，考试时间为100分钟） 答题说明：请选择一个最合适的答案，并将该答案按答题卡要求，在其相应位置上用2B铅笔涂黑。第1题至74题，每题1分，第75题至78题，每题1.5分,第79题至80题, 每题10分。 一、单项选择题 1.______ the engines, the diesel engine is ______ used engine on board. A. Between/more commonly B. Among/the most commonly C. Between/not more commonly D. Among/ not the most commonly 2.The average pressure exerted on a piston during each power stroke is termed ______. A. indicated horsepower B. mean effective pressure C. exhaust back pressure D. compression pressure 3.The cetane number rates fuels for diesel engines according to its ______. A. antiknock characteristics B. ignition qualities C. rates of vaporization D. viscosity 4.The time between injection and ignition of the fuel is known as ______. A. turbulence lag B. after burning ratio C. pre-ignition lag D. ignition delay 5.______ controls the fuel oil temperature in order to provide oil at the correct viscosity for combustion. A. The viscosity regulator B. The temperature controller C. The flow meter D. The pressure switch 6.Constant cooling the various components of diesel engine has a number of functions except for ______. A. good lubrication B. low thermal stress C. good mechanical properties D. acid corrosion 7. A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an ______. A. torque limiter B. over-speed trip C. over-speed governor D. load limit governor 8.Engine speeds at which resonance can occur are termed ______. A. maximum speeds B. full speeds C. sea speeds D. critical speeds 9.Prolonged operation of a diesel engine with a closed cooling water system at lower than normal designed operating temperatures can ______. A. increase power output B. decrease lube oil viscosity C. eliminate fuel knock D. cause sulfuric acid formation 10.______ on a ship transmits power from the engine to the propeller. A. The automatic control system B. The speed regularly system C. The transmission system D. The compression air system 11.In a _____ boiler the hot gases from the furnace pass through the tubes while the water is on the outside. A. water-tube B. fire-tube C. exhaust gas D. composite 12.The fuel supply system to an automatic auxiliary boiler, will be automatically shutdown if the boiler ______. A.salinity is abnormally B.high steam demand is too high C.feed-water flow is low D.water level is abnormally low 13.The water in a steaming auxiliary boiler should be tested daily for ______. A. dissolved oxygen B. chlorides C. sludge D. dissolved nitrogen 14.Ignition failure in an automatically controlled auxiliary boiler could be caused by ______. A. carbon deposits on the flame scanner B. high fuel oil temperature C. low fuel oil viscosity D. high steam pressure 15.The concentration of total dissolved solids in the water of an auxiliary boiler can increase as a result of ______. A. seawater contamination B. frequent surface blows C. dissolved oxygen de-aeration D. frequent bottom blows
轮机英语试题二十三
试题二十三 一、单项选择题： 1.Because the castings of smaller engines are not so big and heavy, ______ and cylinder block may be made in one piece. A. the column B. the jacket C. cylinder cover D. cylinder liner 2.______ of an engine crankshaft can be detected by measuring deflections of crank webs for each unit of the engine. A. Misalignment B. Length C. Strength D. Stresses 3. A common trouble with the fuel pump plungers or fuel valve spindle is______. A. broken down B. stuck C. oil leakage D. carbonized 4.Diesel fuel oil having a low cetane rating can result in ______. A. improved cold weather starting B. smoother engine operation C. combustion knock D. reduce ignition lag 5.______ is arranged for cleaning the lubricating oil in the system and clean oil can be provided from a storage tank. A. A filter B. A centrifuge C. A distiller D. A generator 6.The emulsion of the oil is mainly caused by ______. A. the solid impurities of large particle B. the solid impurities of fine particle C. the water content D. both water and solid impurities 7.Cylinders of marine diesel engines are normally cooled by ______. A. sea water B. fine mineral oil C. sanitary water D. fresh water 8.______ are fitted in the exhaust system and facilitate charge removal and scavenging in each cylinder. A. Diffusers B. Compressors C. Steam boilers D. Soot blowers 9.______ device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed. A. An automatic B. A transmission C. A self-regulating D. An interlocking 10.The difference between a supercharged engine and an un-supercharged engine is that ______ operates at an increased pressure. A. the later B. the latter C. the former D. the farmer 11.______ for attachment to the propeller shaft also accommodates the turning gear and is integrally forged with the crankshaft. A. The coupling flange B. The camshaft C. The cross-head pin D. The cylinder jackets 12.A(n) ______is a chemical or electro-chemical attack on the metal surface which may be further increased if the sea-water is polluted. A. errosion B. corrosion C. cavity D. scouring 13.The two-stroke cycle begins with the piston coming up from the bottom of its stroke, with scavenge ports in the sides of the cylinder being ______. A. shut B. closing C. opened D. closed 14.The governor of a generator engine is to ______. A. make the engine stop
第46期轮机英语试题
第46期轮机英语试题 一单项选择题 D1. In order to concrol thermal stresses ,some types of modern engines use pistons with __ A heavy wall and intensive cooling B heavy wall and no cooling Cthin wall and no cooling D thin wall and intensive cooling B2. The average pressure exerted on a piston during each power stroke is termed A indicated B ean effective pressure C exhaust back pessure D compression pressure A3. The ignition quality of a diesel fuel is indicated by the___ A cetane number B volatility point C viscosity index Doctane number B4. A piston in a four stroke cycle disesel engine makes four stroke during each __ A crankshaft revolution B mechanical cycle of operation C period of two cobustion cycles D cycle of two events C5. Crankshafts of medium speed engines are _____from a single piece of steel A unusually solid welded B never be solid forged C almost invariably D almost invariably be welded B6 .The starting air entering the cylinder begins when the piston ______ A has nearly come to the TDC B has just past the TDC C has nearly come to the BDC D has just past the BDC D7 .A main bearing consists of two shells which are secured by means of studs and _________ A tie rods B through bolts C lead wires D bearing caps B8 .Compared to four stroke cycle engines ,two ~stroke /cye diesel engines have the disadvantage of ________ A less even torque B higher cylinder head temperatures C fewer power strokes per revolution D greater weight /size requirements A9. _____controls the fuel oil temperature in order to provide oil at the correct viscosity for combustion A The viscosity regulator B The temperature controller C The flow metet DThe pressure switch B10. In a diesel engine lube oil system ,which of the following parts should be lubricated first ? A camshaft bearings B Main bearings C Piston crowns D Cylinder walls C11 A large ,low speed ,main propulsion diesel engine uses sea water to directly cool the ________ A cylinder heads B exhaust valves C scavenging air D injectors D12. In a rubocharger ,inlet air velocity is increased in the __________ A inlet nozzle ring B stationary diffuser passages C compressor outlet volute D rotating impeller vanes C13 .Each cylinder has one starting valve which is usually opened by air pressure and closed by _________ A nuts and bolts B new joints C spring force D sealing rings B14. In a simple mechanical governor ,the _________ A centrifugal force rotates the ball-head