1、- 1 -第一章 船舶主推进装置第一节 船舶动力装置概述001 _ are increasingly used as main engine on merchant vessel, because they have a high Hp/ Weight ratio. A. Slow speed diesel engines B. Medium-speed diesel enginesC. Steam engines D. Gasoline engines002 Propulsion of the vast majority of contemporary merchant ships (esp
2、ecially containerships and VLCCs) utilizes _ as prime mover .A. gas turbine B. diesel engine C. steam engine D. gasoline engine003 Typical marine propulsion plants include _ directly coupled to the vessels single large-diameter propeller shafting. A. a single, long-stroke, slow-speed, turbocharged,
3、two-stroke diesel engineB. a single, long-stroke, medium-speed, turbocharged, four-stroke diesel engineC. two medium-speed, turbocharged, four-stroke diesel engineD. a variable-speed AC generator004 With _ , the engine need not to be aligned with reduction gears or propeller shaft .A. Diesel engine
4、propulsion B. Diesel electric propulsionC. Steam engine propulsion D. Gas turbine propulsion005 In todays practice, with cylinders of equal diameter of bore and equal revolutions the two-cycle engine delivers a power about 80 percent _ than that of the four-stroke one.A. greater B. better C. smaller
5、 D. less006 _ can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or a 2-stoke crosshead engine.A. The medium speed 4-stroke trunk piston engineB. The low speed 2-stroke crosshead engineC. The medium speed 2-stroke crosshead engineD. The low speed
6、4-stroke piston engine007 _allows the engines to be placed wherever is most suitable, as they no longer have to be aligned with reduction gearing and shafting as is the case with conventional installations.A. Diesel engine propulsion B. Diesel electric propulsion C. Steam engine propulsion D. Gas tu
7、rbine propulsion008 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 - 2 -C. high-speed diesel D. constant-speed diesel009 Which of the factors listed has the greatest effect on the mechanica
8、l efficiency of a diesel engine ?A. temperature of the intake air B. friction within the engineC. mechanical condition of the supercharger D. mechanical condition of the turbocharger010 What determines the number of events occurring in a cycle of operation in an internal combustion engine ?A. Cranks
9、haft revolution B. Type of engine ( diesel or gasoline)C. Distance a piston travels during a stroke D. Number of pistons011 Compared to four-stroke/cycle engines, two-stroke/cycle diesel engines have the disadvantage of _.A. less even torque B. higher cylinder head temperaturesC. fewer power strokes
10、 per revolution D. greater weight/size requirements012 Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?A. compression must be low for effective spark ignitionB. compression must be low for required horsepower and
11、 torque generationC. compression must be low to prevent pre-ignitionD. compression must be low to have effective pre-ignition013 The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engine is _ .A. they operate between 150 and 450 rpmB. they are connect
12、ed to the propeller by gearingC. their smaller size and weightD. they can be connected directly to the propeller without gearing014 Gas turbines differ from steam turbines in that _ . A. steam rather than gas is used to turn a shaftB. vapor rather than gas is used to turn a shaftC. the former uses g
13、as to turn a shaftD. the latter uses gas to turn a shaft015 The diesel engine is similar to the gasoline engine in that _ .A. both of them are ignited by compressed airB. both of them are the forms of external combustion enginesC. both of them have spark plugsD. the power is developed by the piston
14、in the cylinder017 A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine _ .A. has little or no internal frictionB. has a lower effective compression ratio- 3 -C. operates with scavenge ai
15、r under a positive pressureD. operates without energy absorbing intake and exhaust strokes018 A turbocharged, four-stroke/cycle diesel engine has a large valve overlap than a naturally aspirated four-stroke/cycle diesel engine, in order to increase the _ .A. temperature of the exhaust gases B. energ
16、y supplied to the turbochargerC. air pressure to the intake manifold D. purge of exhausted gases from the cylinders019 Which of the following statements is correct regarding a turbocharged four-stroke/cycle diesel generator?A. At zero load the intake manifold pressure is greater than the exhaust man
17、ifold pressureB. At full load the intake manifold pressure and exhaust manifold pressure are equalC. At full load the intake manifold pressure is less than the exhaust manifold pressureD. At full load the intake manifold pressure is greater than the exhaust manifold pressure020 Medium speed engines
18、have a _power to weight ratio than the slow speed two strokes, but due to the higher speeds tend to have _maintenance intervals.A. higher/reduced B. higher/increased C. lower/reduced D. lower/increased021 The four-stroke cycle is so called because it takes _ to complete the processes needed to conve
19、rt the energy in the fuel into work.A. two strokes of the piston B. four strokes of the pistonC. one revolution of the crankshaft D. four revolutions of the crankshafts022 The difference between a supercharged engine and an un-supercharged engine is that _ operates at an increased pressure.A. the la
20、ter B. the latter C. the former D. the farmer023 A supercharged engine differs from an un-supercharged engine _it operates at an increased pressure. A. in which B. on which C. at which D. in that 024 When a ship in loaded condition floats at arbitrary water line, its displacement is _ to the relevan
21、t mass of water displaced by the ship.A. equal B. larger C. smaller D. equivalent025 The displacement of a ship is _ to the total weight, all told, of the relevant loaded ship.A. larger B. equal C. smaller D. equivalent026 A ship designed for carrying goods requiring refrigeration is called_. A. REE
22、FER B. RO/RO SHIP C. CONTAINER D. TANKER027 “ AMIDSHIPS” refers to _ .A. Back of the vessel- 4 -B. The middle portion of a shipC. A backward movement of a vessel D. Across the ship at right angles to the fore-and-aft centerline028 The depth of the ship below the waterline measured vertically to the
23、lowest part of the hull is called _ .A. trim B. lean C. draft D. tonnage029 Which one is not true?A. Two main areas of skill are involved in the construction of ship.B. There are distinct divisions in responsibilities between naval architects and marine engineers.C. Each ship will assume varying pro
24、portions according to its type.D. Ships can be divided into different categories from different perspectives.030 The additional mark _in the Classification Certificate for Machinery represents the propulsion apparatus is remotely controlled on the navigating bridge control station, and engine room i
25、s watched by duty personnel. A. BRC B. MCC C. AUT-0 D. AUT-1 031 The additional mark _ in the Classification Certificate for Machinery represents that personnel are watching at engine assembly control station and monitoring all machinery and electronic devices. A. BRC B. MCC C. AUT-0 D. AUT-1 032 Th
26、e additional mark _ in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is watched by duty personnel.A.BRC B.MCC C.AUT-0 D.AUT-l033 The additional mark _ in the Classification
27、Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically ABRC BMCC CAUT-0 DAUT-1 第三节 船舶推进装置推进装置的传动方式001 Why a gearbox is needed in a ship driven by a medium-speed diesel engine?A
28、. To reduce the main engine speedB. To increase the main engine speedC. To govern the main engine speedD. To fix the propeller shaft ?002 Some medium and high-speed diesel engines require reduction gear units to provide a useful - 5 -propeller speed. In most reduction gears, the bull gear _.A. must
29、churn the oil in the sump B. is connected to the propeller shaftC. is driven at the highest RPMD. compensates for alignment variations between the engine and pinion gear003 When used with reversing reduction gears, medium-speed diesel engines should be bolted to their foundations with fitted bolts a
30、t the drive end and clearance (loosely fitted) bolts in other locations. This is done to _.A. maintain alignment when the ships hull is working in heavy seasB. ensure engine vibrations correspond to the natural frequency of the hullC. permit the engine to expand away from the driven equipment as the
31、 engine heats up and expandsD. maintain engine thrust bearing clearances004 Gear-type flexible couplings are often used in diesel engine drive trains because they _ .A. require no lubrication under normal operating conditionsB. compensate for gross misalignment in the drive trainC. are able to trans
32、mit high torque, even where slight misalignment existsD. will rapidly disconnect the engine from the line shaft005 When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work _.A. remains the same B. is reduced C. is increased D. is eliminated传动轴系的布置和结构006
33、A propeller, in order to operate efficiently, must rotate at a relatively _ speed.A. high B. low C. fast D. lowly009 Propeller running at _ are generally efficient . A. high speeds B. medium speeds C. low speeds D. the same speed with the engine 010 For a propeller direct driven by the engine, _ . A
34、. the thrust pads are white metal faced on both sides B. the thrust pads are white metal faced only on the forward sideC. the thrust pads are white metal faced only on the after sideD. intermediate shaft usually supported by a Plummer block 012 Which of the following statements describes the purpose
35、 of the split inflatable seal installedaft of the primary seal assembly for the propeller sha A. To serve as a seal when adding packing to the stuffing box. B. To allow repair or replacement of the primary seal elements when the ship is waterborne. C. To eliminate leakage via the propeller shaft whe
36、n the shaft is not rotating. D. To provide a ready means for the entry of cooling water. - 6 -013 The transmission system transmitting power from the engine to the propeller is composed of shafts, bearings, and _.A. propeller B. flying wheel C. main engine D. crankshaft014 The thrust from the propel
37、ler to the hull of the ship is transferred by _.A. tie rod B. thrust blockC. bedplate of main engine D. frame of main engine015 _ is used to prevent the entry of sea water to the machinery space.A. A special sealing gland B. PropellerC. Tailshaft D. Sterntube bearing016 Oil pressure in the lubricati
38、on system is _ than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.A. higher B. lower C. very higher D. very lower018 The transmission system, is the means _ the movement of the rudder is accomplished.A. by which B. to which C. in which D.
39、at which020 The difference between Fixed pitch propeller (FPP) and Controllable pitch propeller (CPP) is in that _.A. for FP, once fitted, the position of the blades can also be changed in operationB. for CP, once fitted, the position of the blades can also be changed in operationC. the CP type has
40、a relatively smaller hub compared with the FP propellers.D. the FP type has a relatively larger hub compared with the CP propellers.舵机035 The _ in the steering gear system provides the force .A. control equipment B. power unitC. transmission mechanisms D. fittings and pipeline036 The _ in the steeri
41、ng gear system move the rudder to the required angle .A. control equipment B. power unitC. transmission mechanisms D. fittings and pipeline037 The _ returns the pump operating rod to mid position as soon as the helmsman stops turning the wheel .A. hunting gear B. cut-off level C. servo-motor D. swiv
42、el block040 During steering gear test _ should be moved through its full travel in both directions .A. pump B. the cylinder C. the hunting gear D. the rudder041 Hydraulically, servo-operated, automatic change over valve utilized in a two ram hydraulic steering gear, serve to _ .A. allow an alternate
43、 main pump to start in the fully loaded condition thus developing immediate full torqueB. prevent either main pump from being hydraulically motored when idle by cross pressure flow- 7 -C. prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure lea
44、ding to over pressurization of the systemD. all of the above042 In an electro-hydraulic steering gear, any change in relative position between the synchronous receiver and the follow-up gear will result in _ .A. driving the rams up against the stop B. closing of the six-way valveC. the pump going to
45、 full stroke D. a corresponding slowing or increasing of the pumped flow rate044 The _ in the steering gear system conveys a signal or desired rudder angle from the bridge (wheel house) .A. control equipment B. power unitC. transmission mechanisms D. fittings and pipeline046 Rudder position is shown
46、 on the bridge by the _ .A. rudder angle indicator B. follow-up gearC. telemotor position D. rapson slide indicator047 Rotation of the steering wheel on the navigation bridge initiates oil pressure being applied to the steering gear rams by _. A. regulating the oil flow with the six-way valve B. mov
47、ing the automatic differential valve C. moving the receiving telemotor which regulates the two-way valve D. varying the angle of a tilting box or eccentricity of a floating ring 049 As the designated rudder angle is being achieved, as a result of the original command input, the steering gear follow-up mechanism is _. A. in motion, providing a null input B. not in mo
