海事局轮机机考必考题

1、1 It is during that work energy is being put into the engine; during the other 3 strokes of thepiston, the engine has to do the work.A. the suction strokeB. the compression strokeC. the expansion strokeD. the exhaust stroke2 The Convention is the first to establish basic requirements on training cer

2、tification andwatch-keeping for seafarers on an international level.A. STCW78 B. STCW95 C. SOLAS74 D. SOLAS883 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

3、List4 The additional mark in the Classification Certificate for Machinery means propulsionapparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.A. BRC B. MCC C. AUT-0 D. AUT-15 The flash point of a residual fuel oil sh

4、ould be used to determine the highest temperature to which oil may be heated.A. for atomizing B. for centrifuging C. in a storage tank D. in the re-circulating line6 Using a file without a handle may result in .A. your work becoming rounded B. injury to your handC. overheating of the file D. pinning

5、is an identification7 “ Insufficiency of manning or insufficiency of certification of seafarersA. substandard ship B. standard ship C. over-standard ship D. reference ship8 Thermostatic steam pressure reducing valves are used in the fuel oil service system to control theA. double bottom fuel oil tan

6、k temperatureB. heater supply steam flowC. pressure of the fuel supplied to the burnersD. at temperator steam flow in the heater discharge circuit9 Which of the listed governor characteristics will greatly affect the load sharing relationship between paralleled diesel generators?A. Sensitivity B. Po

7、wer C. Speed droop D. Compensation10 To shut down a diesel engine after it exceeds the set maximum speed， which type of device listed should be used?A. Speed limiting governor B. Over-speed governor C. Over-speed tripD. Over-speed relay11 By comparing the exhaust gas temperature of each cylinder, th

8、e 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. calorimeter12 Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?A. Impeller B. Comp

9、ressor C. After-cooler D. Exhaust differ13 The condensers located in various stages of a flash evaporator are cooled by_.A. distillate B. seawater C. brine D. air14 The cetane rating of diesel fuel is an indication of the .A. ignition quality of the fuelB. calorific value of the fuelC. flash point o

10、f the fuelD. rate of fuel consumption15 Diesel engine air start system check valves are opened by .A. an air start cam B. cylinder compression pressure C. starting air pressure D. valve springs16 Cold weather starting of a diesel engine may be made easier by .A. decreasing the compression ratioB. us

11、ing a special fuel having a high ignition temperatureC. increasing the starting air supplyD. heating the jacket water17 Flame failure in an automatically fired auxiliary boiler can from a/an .A. incorrect electrode settingB. incorrect nozzle positionC. clogged fuel nozzleD. broken high tension lead1

12、8 Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?A. Sub-cooled liquid B. Sub-cooled vapor C. Superheated vapor D. Liquid19 A purge recovery system is used in a centrifugal air conditioning or refrigeration system toA. purge lube oil from

13、the liquid refrigerantB. recovers water purged from the systemC. separate foul gases from the receiverD. purge non-condensable gases without losing refrigerant20 For a given exhaust gas boiler, what is the quantity of its evaporation mainly determined?A. the temperature and flow quantity of the exha

14、ust gas from M.EB. the quantity of steam demandedC. the rotary speed and the cooling water temperature of main engineD. efficiency of M.E turbocharger21 are used to digest the sewage to produce innocuous sludge in a biological sewagetreatment plant.A. anaerobic bacteria B. aerobic bacteria C. air bu

15、bbles D. disinfection chemicals22 connectors hold best if a wire is accidentally pulled or a connection becomes loose.A. Ring type B. Fork type C. Spade type D. Push on pull off type23 The shipboard oil pollution emergency plan will be invalid after .A. one year B. two years C. four years D. five ye

16、ars24 Which one is NOT the clear groundsedefotarialedmionrspection?A. the master and the chief engineer are unable to communicate effectivelyB. serious corrosion on the hullC. damaged sanitary pumpD. one page missing in the oil record book25 Under MARPOL Code the ship to which it applies has to carr

17、y .A. an International Ship Security CertificateB. an International Oil Pollution CertificateC. a Safety Management CertificateD. an International Ballast Water Management Certificate26 Engine parameters shall be corresponded to NOx Technical Files. This is required by .A. MARPOL Annex III B. MARPOL

18、 Annex VI C. MARPOL Annex V D. MARPOL Annex VI 27 If separating effect is not good, which measure should be taken .A. working at intervals and properly heatingB. warming up to 70 C , increase water supply flowC. improving impulse of water supplyD. reducing water supply flow28 When does auxiliary bur

19、ner of incinerator put into operation? I. start incinerator when it is cold II. the sludge for dealing with is little III. the sludge for dealing with is large IV. the water and impurity in sludge are too much V. the temperature in incinerator is low VI. dealing with little solid rubbishA. I+II+III+

20、V B. I+II+III+IV C. I+IV+V+VID. I+II+III+VI29 One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is _A. seal water supply be cut offB. make up water supply be cut offC. oil outlet valve closed or not open sufficientlyD. the flow rate of oily water is too much30

21、is not installed on the main switchboard.A. Ammeter and changeover switchB. Power factor meterC. SynchroscopeD. Reverse sequence relay31 During the diesel engine running, the water level of F.W expansion tank should normally kept in the level of glass tube.A. the highest B. above 3/4 C. 1/2 -3/4 D.

22、the lowest32 Which of the following items don t belong to dock repair works?A. making the repair list, booking spare parts and special tools for the dock repairB. shutting off all of the S.W valves to outboardC. the sketches or diagrams used for the dock repairD. cleaning up the oil tank and boiler

23、before enter the dock33 The treatment of the fuel oils involves storage, heating, filtering and .A. centrifuging B. pressurizing C. atomization D. igniting34 If two A.C. generators are to be operated in parallel, the load is distributed evenly by .A. means of rheostat the governor settingsB. a balan

24、ce coil excitationC. adjusting the governor settingsD. changing excitation35 The main purpose of port State control is not to.A. prevent an unsafe ship proceeding to seaB. prevent a ship threatening the marine environmentC. fine the shipsD. confirm a safe sailing36 To proceed to the assistance of a

25、ship in distress is .A. an obligation for masters of passing by shipsB. optional for masters of passing by ships when the weather is fineC. prohibited by the Convention SOLAS, 1974, as amendedD. prohibited by the convention STCW 78/9537 According to the way the energy of the exhaust gases is utilize

26、d, pressure-charging can be divided into two main systems, namely, the constant-pressure system and .A. the pulse-phase systemB. the pulse Doppler systemC. the pulse systemD. the pulse interval system38 For a purifier changing to a gravity disc with smaller hole diameter will move the interface towa

27、rds the .A. bowl peripheryB. bowl center C. upper surface D. lower surface39 One factor that determines the frequency of an alternator is the .A. number of turns of wire in the armature coilB. number of magnetic polesC. strength of the magnets usedD. output voltage40 is a precaution which contribute

28、s to avoiding trouble under normal operatingconditions.A. Constant inspection B. Keeping constant loadC. Remaining constant temperature D. Varying speed41 Convection spreads a fire as a result of .A. transmitting the heat of a fire through the ships metalB. burning liquids flowing into another space

29、C. heated gases flowing through ventilation systemsD. the transfer of heat across an unobstructed space42 firemans outfit carried onboard cargo vessels, must have a .A. canister-type gas mask B. fresh-air breathing apparatusC. self-contained breathing apparatus D. combustible gas indicator43 The dew

30、 point of air is reached when the wet bulb temperature is .A. twice the dry bulb temperatureB. 10 C above the dry bulb temperatureC. 5 C above the dry bulb temperature D. equal to the dry bulb temperature44 Oily water separators are used to ensure that ships dont discharge oil when pumping outA. bal

31、last waterB. boiler waterC. bilge waterD. sewage water45 Which is the pollution prevention equipment?A. booster pumpB. evaporatorC. incineratorD. cooler46 Fires involving combustible metals are classified as .A. class A firesB. class B fires C. class C firesD. class D fires47 CO2 extinguishes a fire

32、 by .A. a blanket of bubbles formed on the surface of the fireB. smotheringC. isolating the heat from the fuelD. cooling48 “Inability to provide for the first watch at the commencement of a voyage and for subsequentrelieving watches persons who are sufficiently rested and otherwise fit for duty. ”is

33、 considered to be one of the detainable deficiencies（ 缺乏 ） under .A. the SOLAS ConventionB. the MARPOL ConventionC. the STCW ConventionD. the LOAD LINE Convention49 Among the basic categories of equipment, which of the following is used to convert hydraulic energy into continuous rotary motion?A. hy

34、draulic pumpsB. valvesC. hydraulic cylindersD. hydraulic motors50 circuit breaker and a fuse have a basic similarity（ 类似 ） in that they both .A. can be reset to energize the circuitB. should open the circuit when overloadedC. will burn out when an over current flow developsD. should short the circui

35、t when overloaded51 The projection on a shaft designed to change circular motion into up and down or back and foremotion is called A. wheelB. crankshaft C. running gearD. cam52 Throttli ng in theline of a cen trifugal pump in volves the risk of the pump cavitati onA. suct ionB. exhaustC. pressure D.

36、 discharge53. In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?A. Distiller air ejector cooli ng mediumB. Saltwater heater dischargeC. First-stage in ternal feed boxD. Secon d-stage in ternal feed box54 .The abbreviation ” MIP”tands for,A. mi

37、ddle in dicati ng pressure B. mean in dicated pressureC. mean pitchD. middle in dicated power55.ln a compressi on refrigerati on pla nt, the hot, high pressure refrigera nt gas is cooled by the sea water and becomes liquid in the.A. compressorB. conden serC. throttle valveD. evaporator56. Before a m

38、arine diesel engine is started the cyli nders and pist ons must be.A. cooled to appropriate temperatureB. warmed up gradually to appropriate temperatureC. ope ned up and ren ewedD. gro und and polished57. of differe nt thick ness are in serted betwee n the shells to en able adjustme nt of the beari

39、ngclear ness.A. Screws B. Films C. Dieses D. Shims58. The process of addi ng moisture to air to in crease the relative humidity is known asA. sublimati onB desiccati on C. humidificati onD. mini aturizati on61 Which term describes piston pins having bearing surfaces in both the piston bosses and con

40、necting rod eye?A. Statio naryB. Full float ingC. Semi-floati ngD. Free rolli ng62 Fuel injected into a diesel engine cylinder is ignited by.A. the heat compressed fuel/air mixture in the cyli nderB. the fuel ign iterC. the fuel injectorD. the fuel pump63 Since the burning or combusti on takes place

41、 with in the engine itself ,the engine is known asA. a fire-tube boilerB. an internal combustio n engineC. an exter nal combusti on engineD. an internal combusti on gen erator65 Fuel injectors used in heavy fuel oil systems are usually provided with cooli ng to reduceA. cold corrosi on of the no zzl

42、esB. fuel viscosity for better atomizati onC. carb on accumulati on on the no zzlesD. fuel det on atio n in the cyli nders66 After the engine is warmed, we shouldthe tur ning gear before start ing up theengine.A. take in B. put in C. take out D. put up67 The tran smissi on system is made up of shaft

43、s, beari ngs, and fin ally the.A. thrust shaftB. propellerC. reducti on gear boxD. train tran smissi on68 When a vessel is in dry-dock, the vessel engineers should.A. exam ine the con diti on of the propeller.B. chip and paint all hull protect ion zincsC. in stall new dock ing plugs in all cofferdam

44、sD. in spect the hull for hoggi ng or saggi ng69 The amount of heat released by steam whe n it cha nges to water at the same temperature is calledA. late nt heat of conden sati onB. late nt heat of vaporizati onC. late nt heat of saturati onD. sen sible heat of conden sati on70 The pump has a consta

45、nt stroke of fuel delivered is regulated by rotatingwhich has aspecially arran ged helical groove cut into it.A. the pump cyli nderB. the pump cam C. the pump plun gerD. the pump roller71 Reduced capacity, accompanied by vibration and noise at the suction of a centrifugal pump is aresult of.A. cavit

46、ati onB. water hammerC. fluid frictio nD. steam knock73 The separatio n of impurities and water fromis esse ntial for good combusti on of dieselengin es.A. lube oilB. fuel oilC. turb ine oilD. grease74 In an oily water separator the oil will travelto the oil collect ing spaces.A. upwardsB. dow nward

47、s C. outwardsD. forwards75 In which of the areas listed would you expect to find the highest salt concentration in a flash evaporator?A distiller air ejector cooli ng medium B saltwater heater dischargeC first-stage in ternal feed boxD sec on d-stage internal box76 In a ordinary cargo crane,is fitte

48、d to rotate the crane.A. the slewi ng motorB. the luffi ng motorC. the hoisti ng motorD. none of the above77 Among the basic categories of equipment, which of the following are used to convert hydraulic en ergy into con ti nu ous rotary motio n?A. Hydraulic pumps B. Valves C. Hydraulic cyli ndersD.

49、Hydraulic motors78. An accide ntal path of low resista nee, allow ing passage of abno rmal amount of curre nt is known as a/an-.A ope n circuitB short circuit C polarized gro undD gro und reference point79 Equal power factors on paralleled AC gen erators are maintained by an automatic.A voltage regulator B reverse power relayC reverse curre nt relayD