轮机英语测试卷

轮机英语轮机英语 测试卷测试卷 本试卷卷面总分 100 分 及格分为 60 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 100 题 每题 1 分 单项选择题 1 If an auxiliary diesel engine does not shut off the trouble may be A leaky fuel injectors B low firing pressure C high firing pressure D seizure of pistons 2 If an auxiliary diesel engine stalls frequently the main cause may be A faulty ftiel injection equipment B excessive crankshaft clearance C an incorrectly assembled governor idle spring D high exhaust back pressure from one cylinder 3 If the engine does not start on air it may be due to A low compression of the fuel pumps B incorrect timing of fuel pumps C the starting air valves stuck D air locks in fuel oil pipeline 4 If the engine does start on air but combustion does not immediately begin the cause may be A failure of the fuel pumps B starting air pressure too low C stop valve in air line closed D the turning gear still engaged 5 In the incoming air is directed upwards pushing the exhaust gases before it and then the exhaust gases travel down A loop scavenging B cross scavenging C uniflow scavenging D supercharging 6 In the incoming air passes over the piston crown then rises towards the cylinder head The exhaust gases are forced before the air passing down and out of exhaust parts located just above the inlet ports A loop scavenging B cross scavenging C uniflow scavenging D supercharging 7 In an oil cooler circulated by sea water the oil is at a larger pressure the result being that any leak in the cooler will mean a loss of A oil B sea water C refrigerant D fresh water 8 In an ordinary diesel engine the fuel injection begins A after TDC B before TDC C after BDC D before BDC 9 On opposite ends of a single shaft of a turboblower are a gas driven and a air compressor which are sealed each other A charge air receiver B scavenging air belt C turbine D air cooler 10 On the top of the cylinder is mounted the cylinder cover which is pressed onto of the cylinder liner by means of nuts and studs A the camshaft B the flange C the ridge D the bulge 11 Sealing between the crankcase and scavenging air boxes for a two stroke diesel engine is achieved by means of A the connecting rod stuffing boxes B the rings in the stuffing boxes C the sealing rings of piston D the scraper rings of piston 12 Sediment collects in a tubular purifier A on top cover B on sides of bowl C in drain line on the discs D on the discs 13 The chamber is enclosed between the cylinder head and piston A lubrication B injection C cooling D combustion 14 The or balance tank collects the re circulated fuel oil A buffer B sump C bilge D overflowing 15 The crank pin journal is provided with large bores for A lubrication B cooling C balancing purpose D ventilation 16 The crank throws are displaced from to obtained the same number of degrees between the different crank throws A one another B the other C each other D each others 17 The crankshaft is of the semi built type with the journal the forged or cast steel crank throws A shrunk into B expanded into C extended into D designated into 18 The crankshaft rests in bearings built into cross girders of A A shape frame B cylinder block C the bed plate D the double bottom 19 The crankshaft should be turned by means of to see that all parts move freely A a steering gear B a chain gear C a turning gear D a sever motor 20 The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives them The difference is termed A nip B nap C gap D lip 21 The lube oil in the bearings is drawn from a usually located in the bed plate A tank B sump C vessel D bottle 22 The lubricating oil is pumped from the drain tank very often with in the suction line A a filter B a strainer C a magnetic filter D a fine strainer 23 The majority of medium speed and high speed marine diesel engines for main or auxiliary drive operate on the cycle A two stroke B four stoke C long stroke D short stroke 24 The oil is drawn from a drain tank through one of a pair of pumps into one of fine filters A a strain tank B a head tank C a service tank D a strainer 25 The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to the acid conditions A invade B provide C detergent D neutralize 26 The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the caused by the friction at the bearings A acids B additives C heat D gear 27 The quantity of oil injected into the cylinder can be regulated A by turning the pump plunger B by vary the fuel valve spring force C by no means by controlling the governor 28 The remaining oil in the lubricating pipes and dusts should be blown out with A atmosphere B the fresh water C compressed air D chemical compounds 29 The turbo blower comprises a gas turbine and a A condenser B blower C soot blower D air receiver 30 The two halves of connecting rod large end bearing are held together by A bridges B tap bolts C jack bolts D shims 31 The two stroke cycle begins with the piston with the air inlet ports or scavenge ports in the sides of the cylinder being opened A coming down from the B D C B coming up from the B D C C coming down from the T D C D coming up from the T D C 32 The withdrawing of the cylinder liners in general depends on their This may amount to approximately 1 120 of the diameter in some engines A correct maneuvering B wear C working efficiency D maintenance 33 When the order is received from the bridge the main air stop valve in the starting air line should be shut A stand by engine B full ahead C finished with engine D full away 34 When the piston is pushed down it forces the engine to do work on the crankshaft which in turn drives A the ship s rudder B the ship s propeller C the turning gear D the thrust bearing 35 Clearance volume scavenging in a turbocharged four stroke cycle diesel engine is accom plished A during the valve overlap period B with only the exhaust valve open C at a pressure below atmospheric D without cooling the cylinders or pistons 36 Mist detectors used on large low speed main propulsion diesel engines monitor and check for the presence of A fuel oil vapor at the sludge tank vent B unburned fuel vapors in the scavenge air receiver C lube oil vapors in the crank case D lube oil vapors in the engine room 37 Whether using a centrifuge or a simple filter oil cleaning and filtration will be the most effective when the oil is at a A high temperature and a high viscosity B high temperature and a low viscosity C low temperature and a high viscosity D low temperature and a low viscosity 38 High firing pressures and a low exhaust temperature in a diesel engine may result from A decreased piston to cylinder head clearance B increased exhaust system back pressure C early fuel injection timing D low scavenge air temperature 39 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 40 The governor controlling a diesel engine modulates crankshaft RPM by adjusting the A intake air supply B turbocharger speed C fuel injection pumps D engine speed droop 41 High exhaust temperature and black smoke exhausting from an auxiliary diesel engine can becaused by A engine overload B low combustion temperature C plugged fuel nozzle holes D excessive compression pressure 42 The main purpose of the piston oil scraper rings is to A seal the space between the piston and the liner B reduce the amount of lube oil burned in the combustion chamber C transmit heat from the piston to the cylinder liner D damp out fluctuations of the piston side thrust 43 What causes diesel fuel to be ignited in the cylinder of an operating diesel engine A Spark plug B Heat of compression C Carburetor D Glow plug 44 Some pumps use packing as sealing gland The gland should be A slack enough to allow slight leakage of fluid B slightly clocked C brought up tight so as not to allow any leakage D fitted with a relief valve 45 Air chambers are usually fitted to reciprocating pumps in order to A increase discharge pressure B increase suction vacuum C develop pulsation flow D keep a steady rate of flow 46 In a ordinary cargo crane is fitted to rotate the crane A the slewing motor B the luffing motor C the hoisting motor D none of the above 47 The crane is usually mounted on a pedestal to offer adequate to the operator A time B space C length D visibility 48 A refrigprant boils and vaporizes in the in a compression refrigeration system A liquid receiver B compressor C condenser D cooling coil 49 A refrigerant gives up heat when it goes through A condenser B regurgitate C evaporator D boil coil 50 It should be ensured that only vapor is handled by the refrigeration compressor A humidity B dry C steam D oil 51 Moisture should be kept out of an R 12 system because it tends to cause A icing of the automatic controls B embrittlement of some parts of the automatic controls C sludge in the lubricating oil D all of the above 52 Air that may enter a refrigeration plant tends to collect in the A upper part of the receiver B upper part of the condenser C down stream end of the cooling coil D outlet end of the condenser 53 With reference to a two ram actuating mechanism which one of the following statement is false A The rams work inside cylinders B The cylinders have glands sealing their open ends C The rams are connected to a cross head D The cross head is mounted on the rudder stock 54 With reference to an axial piston pump which one of the following statements is true A The cylindrical barrel is coupled to the motor B The cylindrical barrel has an odd number of bores C The bores end in sockets D The sockets fit in the swash plate 55 Additional heat extraction from the exhaust gases can be effected by adding an section to the unit in plants A air cooler B economizer C injector D air blower 56 If a heavy sea strikes the rudder the shock is transmitted through to the rams this cause a sudden increase in oil pressure in one of the cylinders A the control rod B the hunting gear C the floating ring D the tiller arm 57 The control rod of a steering gear pump is attached at its outer end to A the hunting gear B the rudder stock C the rudder controller D the feedback unit 58 Where tanks are arranged for either oil or ballast must be fitted in the pipeline A a change over chest B a head tank C a emergency bilge pump D an air cooler 59 The refrigerating agent can at low temperature in the evaporator A expand B evaporate C condense D distil 60 Generating tubes in waste heat boilers are finned to A reduce gas flow turbulence B prevent exhaust gas corrosion C increase the rate of combustion D increase the rate of heat transfer 61 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 deaeration D frequent bottom blows 62 Fins are installed on the generating tube surfaces in waste heat boilers to A prevent soot fires in the exhaust system B prevent exhaust gas erosion of the tubes C increase the velocity of exhaust gas flow D increase the rate of heat transfer 63 Excessive vibration of an automatically fired auxiliary boiler can be caused by A air or water in the furnace B combustion pulses C fuel oil pump failure D flame failure 64 Thermostatic expansion valve are A either all the way open or all the way closed B normally open C throttled depending on load D controlled by suction pressure 65 If a refrigeration compressor is running continuously without lowering temperature as normal in the refrigerator the trouble may be A excessive condenser cooling water B warm food in the refrigerator C a shortage of refrigerant D s shortage of compressor oil 66 Which of the listed conditions can lead to cavitation in a centrifugal pump A Vapor pockets formed in the suction flow stream B Rough casing volute surfaces C Worn wearing rings D Heavy fluid in the flow stream 67 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 68 If a centrifugal pump vibrates and is noisy when operating the cause could be A worn gland sealing shaft B worn wearing rings C a bent shaft D reversed pump coupling 69 Distilled water from an evaporator may be discharged into a potable water 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 70 If the discharge valve is closed before the drive motor is stopped which of the following types of pumps will most likely be damaged A Centrifugal B Gear C Propeller D Tuibine 71 When the relief valve opens it discharges high pressure refrigerant vapor to the A liquid strainer B refrigerant inlet of the condenser C inlet side of the evaporator D suction side of the compressor 72 The pressure of a liquid leaving the pump can be referred to as the A total head B discharge head C net positive suction head D suction head 73 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 74 White smoke exhausting from an operating diesel engine may indicate A a cracked liner B burning lube oil C an overloaded engine D insufficient combustion air 75 Defective timing gear in a diesel engine may lead to A smoky exhaust B starting failure C overload D over speed 76 Poor combustion in a diesel engine can be caused by A high compression pressure B low intake air temperature C low exhaust pressure D high scavenge air temperature 77 An automated diesel engine should normally shut down due to A low lube oil temperature B high ambient air temperature C low lube oil pressure D high exhaust system back pressure 78 To successfully reduce an excessively high diesel engine exhaust gas temperature you should A reduce the engine driven fuel pump outlet pressure B retard the fuel injector timing to reduce power C increase the fuel rack setting D reduce the load on the engine 79 the engine must be stopped immediately A Should knocking occur B If knocking occur C Should if knocking occurs D If occur knocking 80 Lower suction pressure of a pump may be caused by A too much air in the pipe line B closed inlet valve C empty tank D leaky pipe 81 Each journal and pin should be examined for and grooving A bridges B recesses C rears D ridging 82 A built up exhaust valve is one in which A the stem and heads are made of different material B low alloy steel is used throughout C a replaceable valve disk is welded to the head D the self centering action comes from motion of the valve stem in the guide 83 Combustion knock can occur in the cylinders of a diesel engine under any condition permitting A a shortened ignition delay period B a lean fuel air mixture C excess fuel in the combustion chamber D rapid vaporization of injected fuel droplets 84 The bearing cap and shell are replaced and tightened up until A the nip is zero B the nap is zero C the gap is correct D the clearance is correct 85 The resistance of electric wire will decrease as its A length increases B cross sectional area increases C temperature increases D percent of metallic purities increases 86 Oil mist detectors are usually used on board to detect oil mist density within A the engine crankcase B the engine scavenge boxes C drain tanks D fuel tanks 87 Tools with handles should be used to check electric circuit A plastic B metal C stainless steel D copper 88 The crankcase cover should not be opened until at least minutes after the engine stops A 10 B 15 C 20 D 30 89 Movement of engine no longer required means A Stop Engine B No Engine Revolution C Stand by Engine D Finished With Engine 90 Under the provisions of applicable international conventions ships entitled to fly the flag of a Party are subject while in the port of a Party to control by officers duly authorized by the Party Ships of non parties or below convention size shall be given A more favorable treatment B less favorable treatment C no