期轮机英语.doc

49期轮机英语1. In order to concrol thermal stresses ,some types of modern engines use pistons with _D_A heavy wall and intensive cooling B heavy wall and no cooling Cthin wall and no cooling D thin wall and intensive cooling 2. The average pressure exerted on a piston during each power stroke is termed -B-A indicated B ean effective pressure C exhaust back pessure Dcompression pressure 3. The ignition quality of a diesel fuel is indicated by the_A_A cetane number B volatility point C viscosity index Doctane number 4. A piston in a four stroke cycle disesel engine makes four stroke during each _B_A crankshaft revolution B mechanical cycle of operation 5._A_ 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 _D_. 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 _B_. 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 _D_. 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 _D_. A. increase power output B. decrease lube oil viscosity C. eliminate fuel knock D. cause sulfuric acid formation 10 In a diesel engine lube oil system ,which of the following parts should be lubricated first ?B-A camshaft bearings B Main bearings C Piston crowns D Cylinder walls11 A large ,low speed ,main propulsion diesel engine uses sea water to directly cool the _C_A cylinder heads B exhaust valves C scavenging air D injectors 12 In a rubocharger ,inlet air velocity is increased in the _D_A inlet nozzle ring B stationary diffuser passages C compressor outlet volute D rotating impeller vanes 13 Each cylinder has one starting valve which is usually opened by air pressure and closed by _C_A nuts and bolts B new joints C spring force D sealing rings 14 In a simple mechanical governor ,the _B_A centrifugal force rotates the ball-head B Flyweight centrifugal force is balanced by spring force C flyweight centrifugal force is balanced by hydraulic pressure Dspeeder spring alone actuates the fuel control rod 15 A pyrometer is an instrument commomly used to measure _C_A cylinder pressure B flame intensity C exhaust gas temperature D crankshaft axial aliganment 16 After starting a disesel engine ,which of listed opetating conditions should be checked first?B-Aair box pressure B lube oil pressure C Exhaust temperatures D raw watert perssure 17 A high temperature alarm or _C_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 What preventative maintenace should be done frequently to diesel engine starting air receivers?A-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.19 In reducing engine speed to an efficient propeller speed by the use of reduction gears ,_C_Aspeed 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 20 Which of the following statements concerning fire-tube boilers is correct ?-A-A Combustion gases flow through the tubes B Flames impinge on the tubesC Combustion occurs in the tubesD Water flows through the tubes21 The exhaust boilers are used to recover some of _C_carried in the exhaust gas from the main engine A water B oil C heat D steam22 The water level in a steaming auxiliary boiler will always _D_A rise when the steam pressure is in creased B remain constant as long as the feed pump operates C fall when the steam pressure is decreased D vary as the steam demand changes 23 when lighting off an auxiliary boiler ,which of the problems listed could cause the burners to sputter ?D-A cold fuel oil B low fuel oil pressure C low atomizing steam pressure D Water in the fuel oil 24 If the feed pump for an auxiliaty boier fails to deliver the feed water to the boiler ,the cause may be _B_A High steam pressure in the boiler B abnormally high feed-water temperature C abnormally high boiler watet temperature D steam demand exceeding feed pump capacity 25.Through a _A_pump,the liquid is transferred from the suction to the discharge by the mechanical variation of the volume of a chamber or chambers.A.positive displacement B.ejector C.centrifugal D.air compressor26.Sealing lines provide sealing liquid flow to the stuffing box of a centrifugal pump_B_A.to prevent seawater from passing out the stuffing box when a high suction head is presentB.to cool the shaft C.in place of mechanical seals D.in place of lantern rings27.Which of the valves listed will be cycled from fully open to fully close when the handle is turned 90 degree?-D-A. A rising stem gate valve B.A globe stop valve C.A check valve D. A butterfly valve28. To thoroughly pump out the bilges using a horizontally mounted centrifugal pump, the _A_A. pump must always be primedB. volute must impart a radial and rotary motion of the waterC. suction side connection must guide the liquid to the lantern ringsD. stuffing box should not be allowed any water leakage29. Which of the listed conditions can lead to cavitation in a centrifugal pump?-AA. Vapor pockets formed in the suction flow streamB. Rough casing volute surfacesC. Worn wearing ringsD. Heavy fluid in the flow stream30. Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?-CA. Sub-cooled liquid B. Sub-cooled vapor C. Superheated vapor D. Liquid31. _C_ 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. Heating32. In a chilled water air conditioning unit using a reciprocating compressor, the refrigerating effect the primary refrigerant can be increased by _C_. 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 compressor33. If a plastic film insulation becomes damaged in air conditioning system,_B_ may form within the film. A. evaporation B. condensation C. liquefies D. vaporization34. The resistance to the movement of the globule in oily water mixture depends on its size and the _D_ of the fluid. A. pressure B. velocity C. gravity D. viscosity35. 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 A. the monitoring equipment is out of order B. separating effect becomes bad C. separating effect becomes bad and inner wall is contaminated D. inner wall is contaminated36. Which of the following would not be burnt in an incinerator on board.-D A. waste oil B. waste clothes C. oil rags D. plastic garbage37. Concerning the incinerators operating, which of the following is not correct?-D A. scavenging time should be more than 30 seconds before igniting B. the oil temperature of waste oil tank is 80100 C. first igniting the incinerator with diesel oil, when the temperature of hearth is about 600D. the ash from incinerator can be dumped into sea no distance limitation38. _B_ 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 chemicals39. A centrifuge arranged to separate two liquids is known as _B_. A. an oily water separator B. a purifier C. a centrifugal compressor D. a clarifier40. A centrifugal fuel oil purifier should be shut down if _C_. 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_C_ 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 disk42. In a two-stage flash-type evaporator, excess brine in the first stage automatically passes_C_. 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 condenser43. In which of the areas listed would you expect to find the highest salt concentration in a flashevaporator?-D A. Distiller air ejector cooling medium B. Saltwater heater discharge C. First-stage internal feed box D. Second-stage internal feed box44. Hydraulic control check valve can be used to _B/C_ in the marine hydraulic mechanism. A. control the back pressure of return oil B. Saltwater heater discharge C. First-stage internal feed box D. Second-stage internal feed box45. The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the _B_. A. slide block B. tilting box C. pintle D. reaction ring46. The crane is usually mounted on a pedestal to offer adequate _D_ to the operator. A. time B. space C. length D. visibility47. Which problems can occur if the brake band lining of a wildcat brake becomes excessively worn?-D A. The driving engine will over-speed. B. The anchor will immediately drop C. The clutch will overheat D. The brakes effectiveness will be reduced48. _B_ with various arrangements of barrels are the usual mooring equipment used on board ships. A. Cranes B. Winches C. Capstans D. Windlass49. Overheating of a hydraulic system may be a result of _C_. 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 oil50.Electric circuits are protected against short circuits by means of a/an _C_. A. diode(二极管) B. amplifier C. circuit breaker D. capacitor 51.The electrolyte in a lead-acid storage battery consists of distilled water and _C_. A. hydrogen chloride B. calcium chloride C. sulfuric acid D. muriatic acid 52.When under maneuvering conditions with the machinery being manually operated the control unit or console should be C_.A. automatically controlled B. off powerC. continuously manned D. continuously unmanned53._A_is a precaution which contributes to avoiding trouble under normal operating conditions. A. Constant inspection B. Keeping constant load C. Remaining constant temperature D. Varying speed 54.After “F.W.E.” is given, the air system is shut down, the _C_gear put in, all drains and indicator cocks opened, and the cooling water kept running. A. steering B. timing C. turning D. running 55.A tank which has been sealed for a long period of time can be dangerous because _A_. A. steel surfaces consume oxygen by rusting B. sealed tanks usually form a vacuum C. moisture condenses in the tank, displacing the oxygen D. most tank coatings give off poisonous vapors in the presence of moisture 56.A class C fire is burning _D_. A. diesel oil B. magnesium C. dunnage D. electrical insulation 57.To prevent the spread of fire by conduction, you should _C_. A. close all openings to the areaB. remove combustibles from direct exposure C. cool the bulkheads around the fire D. shut off all electric power 58.After the order _A_ 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 59.A tank has been sealed and unventilated(不通风的) for a long period of time. Which of the following conditions does this indicate?-B A. The tank is safe to enter. B. The tank is especially dangerous to enter. C. Carbon monoxide(一氧化碳) is present. D. Water vapor present when the tank was sealed has oxidized(使氧化). 60.Fires involving combustible metals are classified as _D_. A. class A fires B. class B fires C. class C fires D. class D fires 61.The three basic components of a fire are chain reaction, heat, fuel, and _B_. A. carbon monoxide B. oxygen C. carbon dioxide D. any gaseous substance 62.CO2 extinguishes a fire by _B_. A. a blanket of bubbles formed on the surface of the fire B. smotheringC. isolating the heat from the fuel D. cooling63.Seawater may be used for drinking water _D_. A. at a maximum rate of two ounces(盎司) 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 64.Obviously, for a given fuel oil, its pour point is _A_its cloud point. A. lower than B. higher than C. as same as D. better tha65.During ship manoeuvering,when the diesel is stopped,which of the following items is wrong?-CA.keep all systems running normallyB.main engine is available at any momentC.shut off the starting air bottle outlet valveD.pay attention to the changes of the system parameters66.A tank which has been scaled for a long period of time can be dangerous because_A_.A.steel surfaces consume oxygen by rustingB.sealed tanks usually form a vacuum C.moisture condenses in the tank,displacing the oxygen D.most tanks coatings give off poisonous vapors in the presence of moisture 67.The class of fire on which a blanketing effect is essential to extinguish the fire is_B_.A.ClassA B.ClassB C.ClassC D.ClassD68.Fire in escaping flammable gas are quickly brought under control by_A_.A.stopping the flow of gas B.reducing the chemical chain reaction C.increasing the oxygen supply D.cooling below the autoignition point69.Which of the following stateements is ture coucerning carbon dioxide when used as a fire extinguishing agent?-DA.Carbon dioxide is corrosive when exposed to fire.B.Carbon dioxide should be applised slowly to a large engine room fire.C.Its total cooling effect is far greater than water D.Its smothering effect is excellent for class B fires70.While on watch in the engine room,you hear a continuous sounding of the general alarm,Which of the following actions should you take?-CA.Make an entry in the official logbook.B.Open the master control valves on the fixed CO2 system.C.Start the fire pump and check discharge pressure.D.Secure auxiliary condenser overboard discharge.71.To determine that a compartment contains sufficient oxygen to sustain life,you should use a/an_B_.A.explosimeser B.oxygen indicator C.fresh air indicator D.emergency escape breathing device72.If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped off,the engineer should_D_.A.close the static leg filling valve B.close the overflow tank filling valve C.reduce the oil pumping rate D.stop the fuel oil pumping operation73.The_B_tool is used in precision work to smooth or enlarge a slightly undersized hole.A.round out B.round life C.reamer D.hole driller74.During the dock repair,each sea valve must be disassembled,cleaned and ground well,the sealing surface between the valve and the valve seat should be checked and ratified by_C_before reassembled.A.chief engineer B.surveyor C.the engineer D.the technique personnel of the shipyard76. Each completed page of the Oil Record Book must be signed by the _D_ A. engineer on watch B. chief engineer C. chief mate D. master77. The International Oil Pollution Prevention Certificate required by MARPOL is issued to Chinese flag by the _B_ A. IMO B.CCS C.USCG D.PICC78. If_C_, the PSCO should proceed to a more detailed inspection. A. the PSCOs general impression confirm a good standard of maintenance B. the certificates are valid C. the PSCO believes the ship doesnt meet the requirements D. the PSCO cant find deficiencies at first glance79. The Port State Control officer may witne