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轮机英语大证考试模拟题(四)

轮机英语大证模拟试题（四）

1. During the valve overlap period, "the exhaust pressure of a turbocharged, four-stroke/cycle diesel engine must be less than

the intake manifold pressure to ensure ______.

A. cooler operation of the exhaust system

B. constant pressure from the turbochargers

C. effective cylinder scavenging and cooling

D. effective constant pressure for turbocharger operation

2. The 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 unmanned periodically.

A. AUT-1

B.AUT-0

C.BRC

D. MCC

3. Before replacing a piston you should check the rings to see that all clearances and gaps are within permissible______.

A. discrepancy

B. error

C. deflection

D. tolerance

4. ISM code has applied to the ships as follows except______.

A. High-speed craft of 500 gross tons or more

B. Passenger ships

C. Bulk freight vessels of 500 gross tons or more

D. Warship of 500 gross tons or more

5. In a two-stage flash-type evaporator, excess brine in the first stage automatically passes ______.

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 condenser

6. Motors and generators, both d. c. and a. c., are rated as CMR machines. CMR stands for______.

A. Continuous Maximum Rated

B. Centralized Monitoring Room

C. Continuous Monitoring Room

D. Centralized Maximum Rated

7. When centrifuging heavy fuel oil, an important factor to consider is (are) the ______.①flow rate ②viscosity of the fuel oil

A.①

B. Neither ①nor ②are correct

C.②

D.①②

8. New adopted regulation of SOLAS says the master shall_____ when maintaining the security of the ship.

A. Exercise his professional judgment

B. exercise his professional judgment but be constrained by the company

C. take actions by the ship owner' s order

D. take actions by the company' s order

9. An operational amplifier, as used in today's consoles, has a calculated gain of 5. This means that when the input changes_____.

A. 10 volts, the output changes 2 volts

B. 2 volts, the output changes 10 volts

C. 10 volts, the output changes 5 volts

D. 5 volts, the output changes 10 volt s 【关联题】SOLAS, Chapter IX, and the ISM Code applies to ships, regardless of the date of construction, as follows: Passenger ships, including passenger high-speed craft, not later than 1 July 1998; Oil tankers, chemical tankers, gas carriers,

bulk carriers and cargo high-speed craft of 500 gross tons or more, not later than 1 July 1998; Other cargo ships and mobile offshore drilling units (MODUs) of 500 gross tons or more, not later than 1 July 2002.

The Code’s origins can be traced back to the late 1980s, when concern was growing about poor management standards in the shipping industry. In 1989, IMO adopted Guidelines on management for the safe operation of ships and for pollution prevention

"to provide those responsible for the operation of ships with a framework for the proper development, implementation and assessment of safety and pollution prevention management in accordance with good practice.”

These guidelines were revised in November 1991 and the ISM Code itself was adopted as a recommendation in 1993. However,

after several years of practical experience, it was felt that the Code was so important that it should be mandatory.

It was decided that the best way of achieving this would be through the International Convention for the Safety of Life at Sea,

1974 (SOLAS). This was done by means of amendments adopted on 24 May 1994, which added a new Chapter IX to the Convention entitled Management for the safe operation of ships. The Code itself is not actually included in the Convention, but

is made mandatory by means of a reference in Chapter IX.

10. (4) Which of the following is TRUE?

A. A new Chapter IX to the SOLAS Convention is entitled "International Safety Management".

B. The ISM Code itself is actually included in the SOLAS Convention.

C. The ISM Code is made mandatory by a reference in Chapter 9 of the SOLAS Convention.

D. This passage is mainly on the contents of the ISM Code.

11. (3) According to the passage, a LNG carrier built in 1996 should comply the ISM Code_____.

A. not later than 1 July 2004

B. not later than 1 July 1996

C. not later than 1 July 1998

D. not later than 1 July 2002

12. (2)The ISM Code became to be mandatory______.

A. in 1974

B. in 1993

C. through the SOLAS

D. in 1991

13. (l)The ISM Code’s origins can be traced back to______.

A. the year of 1980

B. the year of 1989

C. the year of 2002

D. the year of 1998

14. If ignited, which of the listed materials would be a class ‘B’ fire?

A. Wood

B. Paper

C. Magnesium

D. Diesel Oil

15. All the rings are slightly rounded on their external top and bottom edges to keep the oil film on the cylinder liner

during______for new piston rings.

A. the boiler firing

B. gas exchange process

C. the running-in period

D. the running process

16. During UMS rounds, a duty engineer notices that the fuel oil overflow observation glass is full of oil. Should he ______.

A. start the F. O. purifier

B. Make a sounding of the F. O. overflow tank and decide if there is enough capacity to leave it until the following morning.

C. Stop all F. O. transfers immediately, and inform the chief engineer.

D. Call a motorman and have him sound the F. O. overflow tank periodically during the night.

17. Which component does not belong to an incinerator?

A. auxiliary burner

B. superheater

C. waste oil burner

D. dump chute

18. The specific gravity of fuel oil is______.

A. absolute value

B. set value

C. constant value

D. relative value

19. The MARPOL Convention is the main international convention_____.

A. about marine pollution prevention

B. about marine

C. covering marine protection of life

D. about ship and port security

20. In the event of minor emergencies when the machinery spaces unattended, ______ will be informed of malfunctions in the machinery by his cabin monitor.

A. the bridge officer on watch

B. the chief engineer

C. the engineer on cabin watch

D. the master

21. Scale formation in a flash-type evaporator is usually found on the_____.

A. tubes of the air ejector condenser

B. flash chamber walls

C. tubes of the salt water feed heater

D. tubes of the distiller condenser

22. Which one is not the ' clear grounds ' for a more detailed inspection?

A. serious corrosion on the hull

B. damaged sanitary pump

C. one page missing in the oil record book

D. the master and the chief engineer are unable to communicate effectively

23. In______ boiler the water flows through the inside of the tubes while the hot gases pass around the outside.

A. an exhaust gas

B. a fire-tube

C. a water-tube

D. any kind of

24. In the diesel engine, bearing replacement requires lifting the ______ which is held from above with studs and nuts.

A. bush

B. web

C. journal

D. bearing cap

25. The emergency generator or emergency battery is connected to______ on most large ships.

A. main switch boards

B. emergency switch boards

C. section boards

D. distribution boards

26. Which can make circuit and realize off circuit under normal condition?

A. voltmeters

B. synchroscope

C. distribution box

D. over speed governor

27. To maintain design discharge pressure from a centrifugal pump, the design clearance must be maintained between

the______.

A. motor and pump shaft

B. casing and impeller wearing rings

C. lantern ring and impeller

D. shaft and impeller

28. The alarm signal for engine room catching fire is a blast of random bell followed by______.

A. three knocks

B. five knocks

C. four knocks

D. two knocks

29. In order to increase the wearing resistance, the cylinder liner surfaces are sometimes______.

A. bronze-plated

B. chromium-plated

C. zinc-plated

D. aluminum-plated

30. If a centrifugal pump operating with a positive suction head becomes air bound, your first response should be to______.

A. vent the casing

B. re-prime the pump

C. tighten the packing

D. close the discharge

31. In a modern three-phase A. C. synchronous brushes generator, the excitation winding is on the rotor. That means______.

A. The winding on the rotor is for inputting excitation current.

B. There are three phase windings on the rotor.

C. The generator has no brushes.

D. The generator needs not excitation.

32. The International Sewage Pollution Prevention Certificate shall be issued for a period specified by the Administration, which shall not exceed ______ from the date of issue.

A. five years

B. one year

C. three years

D. six months

33. An orifice-check valve placed in a hydraulic system is used to______.

A. allow free movement of hydraulic fluid in both directions

B. restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction

C. allow a restricted fluid flow in one direction only

D. regulate the fluid flow in either direction

34. Scale formation on the waterside of boiler tubes, is generally produced by______

A. dissolved oxygen in the waterside

B. metal oxides in the waterside

C. the salts of calcium and magnesium

D. accumulations of phosphates in the feedwater

35. If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the______.

A. oil solids will be deposited only at the intermediate top disk

B. oil will be lost through the water discharge ports

C. oil has a tendency to emulsify in the bowl

D. purifier will act as a clarifier at the discharge ring

36. Hydraulic pumps most commonly used in steering systems are of the______.

A. volute type

B. axial piston type

C. screw type

D. lobe type

37. However, once the temperature rises to the point where decomposition of the steam into oxygen and hydrogen could occur, 649℃, the use of _____ would then intensify the fire and a serious explosion could result.

A. CO2 extinguisher

B. soot blowers

C. dry chemical

D. foam extinguisher

38. Noxious emissions amount to 0.25~0.4 percent by volume of the ______, depending on the amount of sulphur in the fuel and its lower heat value, and the engine type, speed and efficiency.

A. sulphur

B. suction air

C. exhaust gas

D. discharging air

39. The quantity of cooled air delivered by an air conditioning unit should ______ the sum of the quantity of air recirculated to the unit and the quantity mechanically exhausted.

A. balance

B. equal

C. be above and beyond

D. be less than

40. To incinerate solid waste, ______ and then charge it through the solid waste du mp chute.

A. start the auxiliary and waste oil burners

B. stop the auxiliary and waste oil burners

C. start the auxiliary burner and stop the waste oil burner

D. stop the auxiliary burner and start the waste oil burner

41. ______on a ship transmits power from the engine to the propeller.

A. The compression air system

B. The speed regularly system

C. The transmission system

D. The automatic control system

42. An inadequate reciprocating bilge pump discharge is most often caused by______.

A. clogged suction strainers

B. clogged drain valves

C. defective safety valves

D. scarred cylinder walls

43. The term used to express the ignition quality of a particular fuel is______.

A. volatility point

B. ignition index number

C. cetane number

D. octane number

44. After making the required notification that a large oil spill into the water has occurred, the FIRST action should be to______.

A. throw grains of sand into the oil

B. apply straw or sawdust on the oil

C. have the vessel move out of the spill area

D. contain the spread of the oil

45. ______allows for expansion and water make up in the water cooling system.

A. A settling tank

B. A head valve

C. A head tank

D. A drain tank

46. In a diesel engine, when the fuel is injected into the cylinder, ______.

A. the piston has just past the TDC

B. the piston has moved about one-fifth of the way up

C. the piston has almost reached the TDC

D. the piston is just coming upward from the bottom dead center

47. The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its______.

A. thermal efficiency

B. volumetric efficiency

C. mechanical efficiency

D. brake thermal efficiency

48. The temperature of a refrigerant gas is the highest______.

A. in the expansion valve

B. in the receiver

C. at the compressor suction

D. at the compressor discharge

49. The level of the ratings which consist of the engine room watch is______.

A. Operation 1evel.

B. support level

C. Officer level

D. service level

50. When administering artificial respiration, it is of the utmost importance to_____.

A. use the mouth-to-mouth method

B. use rhythmic pressure method

C. check the injured person s heartbeat

D. clear airways

51. Which distribution system has largely been used on the board?

A. a. c. system

B. earthed neutral

C. insulated earth

D. the fuse

52. When the union purchase derrick is operated, one derrick is positioned over the quayside and the other almost vertically over the______. A. dock B. pedestal C. cargo hold D. machinery space

53. Temperatures in the cylinder are naturally high, though only______are (is) subjected to actual flame temperatures.

A. the cylinder combustion space

B. the cylinder combustion space and piston crown

C. the cylinder head and piston

D. the piston crown

54. CO2 extinguishes a fire by _____.

A. isolating the heat from the fuel

B. a blanket of bubbles formed on the surface of the fire

C. smothering

D. cooling

55. In a four-stroke/cycle diesel engine, the camshaft rotates at______.

A. the same speed as the crankshaft

B. twice the crankshaft speed

C. half the crankshaft speed

D. a speed independent of the crankshaft

56. The upper piston rings in large, slow-speed, two-stroke/ cycle diesel engines are roost effectively lubricated by oil______.

A. supplied from wick fed drip lubricators

B. thrown off from the main bearings

C. flow from a centrifugal or banjo oiler

D. fed from mechanical lubricators

57. In automatic______, the winch may be overhauled and wire is paid off the barrel at a pre-determined maximum tension.

A. mooring winches

B. capstans

C. cranes

D. windlass

58. Prior to any overhaul work on electric equipment, it is important to ensure the circuits are______

A. excited

B. on line

C. dead

D. live

59. _____device is provided to prevent starting air from being admitted to the cylinder before the reversing is completed.

A. An automatic

B. An interlocking

C. A transmission

D. A self-regulating

60. When is the dock survey carried out?

A. After 5 years from last annual survey

B. Usually during dock repair

C. Before sea trial

D. During annual repair

61. If a crankcase explosion occurs in a diesel engine, you should stop the engine and______.

A. allow the engine to cool naturally

B. immediately open all crankcase relief ports

C. increase crank case scavenge air to remove unburned gases

D. increase crankcase exhauster speed to draw cool air into the engine

62. 'Insufficiency of manning or insufficiency of certification of seafarers' is an identification of a/an______.

A. substandard ship

B. standard ship

C. over-standard ship

D. reference ship

63. With a purely resistance load the voltage and current are in phase, giving a power factor of ______.

A. less than one

B. one

C. negative one

D. more than one

64. The device used for preventing the passage of flames into enclosed spaces is called _____.

A. safety valve

B. flame relief valve

C. flame arrester

D. flame stopper

65. Sludge may form in the crankcase of an air conditioning compressor as a result of ______.

A. reducing the cloud or floe point

B. bubbling refrigerant

C. lowered operating temperatures

D. overheating and oxidation

66. The main operating characteristic of diesel engines which distinguishes them from other internal combustion engines is the_____. A. valve op erathing mechanism B. method of supplying air C. method of igniting fuel D. cooling system

67. If two A. C. generators are operated in parallel, the load is distributed evenly by______.

A. changing field excitation

B. a rheostat

C. adjusting the governor settings

D. a balancing coil

68. Before stopping the oil purifier, you should______.

A. cut off the power

B. close oil outlet valve

C. open guide water valve

D. shut off the oil inlet firstly.

69. Before stopping the oil purifier, you should______.

A. cut off the power

B. close oil outlet valve

C. open guide water valve

D. shut off the oil inlet firstly.

70. Which of the following machinery space operations is required to be logged in the Oil Record Book?

A. Shifting suction of main fuel pump to reserve fuel oil tank.

B. Ballasting or cleaning of fuel oil tanks.

C. Daily inspection of engine room bilges.

D. Changing out sprayer plates to adjust for steam demand.

71. A DC generator is used to supply direct current in order to maintain an AC generator field and is known as a/an______.

A. stator

B. armature

C. exciter

D. Rotor

72. When received the order "Finished With Engine", which of the following operations is wrong?

A. stop the L. 0 pump, S. W pump, jacket water cooling pump immediately

B. engage the turning gear, turn the main engine

C. open the main engine scavenge air trunk's drain cocks

D. stop the F. 0 booster pump

73. Before the oily water separator put into operation, it should be______.

A. filled with bilge water

B. filled with oil

C. emptied

D. filled with clean water

74. Which of the following procedures decreases the total dissolved solids concentration in the water of an auxiliary boiler?

A. Frequent compounding

B. Chemical cleaning

C. Bottom blowing

D. Hydrazine treatment of condensate

75. The officer in charge of the engineering watch shall ensure that all machinery involved with the maneuvering of the ship can be immediately be placed in the manual mode of operation when notified that the ship is ______.

A. in congested waters

B. in an open road-stead

C. at unsheltered anchorage

D. at anchor

76. Which of the listed characteristics of lube oil are the most important to the engineer from an operational standpoint ?

A. Viscosity, acidity, and demulsibility

B. Autoignition point, viscosity index, and film strength

C. Ash content, carbon residue, and gravity

D. Pour point, flash point, and precipitation number

77. The part of the anchor windlass that engages the anchor chain for lifting is called the______.

A. capstan

B. fair lead

C. warping head

D. wildcat

78. To increase the frequency of an operating AC generator, you should______.

A. decrease the field excitation

B. increase the speed of the prime mover

C. increase the number of magnetic poles

D. increase the field excitation

79. In____engines, exhaust also takes place through a row of ports in the cylinder, these being arranged just above the air ports.

A. naturally aspirated

B. loop-scavenged

C. turbo charged

D. uniflow scavenged

80. The dew point is reached when the wet bulb temperature______.

A. 50C above the dry bulb temperature

B. less than the dry bulb temperature

C. equal to the dry bulb temperature

D. twice the dry bulb temperature

81. A marine diesel engine is started by______.

A. supplying high pressure oil into a hydraulic motor

B. electrical igniting

C. supplying high temperature air into the cylinder

D. supplying high pressure air into the cylinder

82. The activated sludge strength should be checked at regular intervals, and it is good that the color of the aeration compartment water is______. A. chocolate B. yellow C. blackish D. ivory-white

83. A generator is prevented from becoming motorized by the use of a/an______.

A. over-speed trip

B. governor controls

C. reverse power relay

D. back pressure trip

84. Gear pumps are of positive displacement type pumps because they discharge a near constant amount of liquid______ pressure. A. in relative to B. depending on C. because of D. regardless of

85. Which of the following is least likely to cause the ignition of fuel vapors?

A. An open running electric motor

B. Static electricity

C. Explosion proof lights

D. Loose wiring

86. The lifting pressure of ______is set in the presence of a surveyor, it is locked and cannot be changed.

A. safety valves of marine boiler

B. injector pump of main engine

C. safety valves of a reciprocating pump

D. fuel valves of main engine

87. Be sure to make the engine turn by ______ before starting and after stopping.

A. steering wheel

B. steering gear

C. turning gear

D. turning cycle

88. If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperature, then the air should be purged, and the ______.

A. compensating needle valve should be opened fully

B. speed limiting device should be adjusted

C. compensating needle valve should be adjusted to stabilize operat ion

D. rack position should be adjusted

89. A defective boiler atomizer couldn’t lead to______.

A. a bad combustion performance

B. low temperature in furnace

C. black smoke

D. high steam pressure

90. Before the seas get rough, it is a good safety practice to______.

A. increase lighting

B. move quickly about the ship

C. secure loose gear

D. shutdown auxiliary equipment

91. Check valve isn’t used to control______.

A. direction of oil flow

B. high pressure overflow

C. bypass of filter

D. back pressure of return oil

92. Oil water separators are used to ensure that ships don t disc harge oil when pumping out______.

A. bal1ast water

B. bilge water

C. sew age w ater

D. boiler w ater

【关联题】

The Wartsila 50DF applies the sophisticated dual-fuel technology incorporated in the reliable and well-tried Wartsila 46 HFO engine. The Wartsila 50DF is designed to provide high output with fuel flexibility, low emission rates, high efficiency and high reliability. The engine functions are controlled by an advanced automation system that allows optimum running conditions to be set independent of the ambient conditions or fuel. Both the gas admission and pilot fuel injection are electronically controlled.

This ensures that the correct air-fuel ratio can be set for each cylinder individually and that the minimum amount of pilot fuel can be injected while ensuring safe and stable combustion. All parameters are controlled automatically during operation.

The Wartsila 50DF is designed to meet customer demands for a safe and fuel-flexible engine, running both on gas and on liquid fuel. The 50DF, like all Wartsila engines, has a simple and straightforward design. Its piping and external connections have been minimized, the safety margins are ample, maintenance is easy and rapid, and the electronic safety protection system is a built-in feature. The individually and electronically controlled valves ensure that all cylinders say within the operating window, avoiding knocking and misfiring. This eliminates unnecessary load reductions and shutdowns.

The Wartsila 50DF is designed to give the same output whether it is running on natural gas or on LFO/HFO. For the Wartsila 50DF operating on gas, NO x and CO2 emissions are substantially lower than for an HFO engine. The engine is optimized for emissions of 500mg / m3 at 5%O2, dry and fulfils the German TA-luft standard for operation on natural gas. This corresponds to 2 g/KWh of NO x. Back-up fuel: 970 ppm vol @15%O2, dry, for World Bank NO x or below 12.91 g/kWh following the marine requirements.

93. (4) Which of the following can NOT be used on the Wartsila 50DF?

A. LNG

B.F.O.

D.O. D. Coal gas

94. (3)The gas admission and pilot fuel injection of the Wartsila 50DF are controlled by_____.

A. Electronically and individually controlled servomotor

B. Electronically and independently controlled valves

C. Electrically and integradually controlled valves

D. Electrically and individually controlled servomotor

95. (2) Which of the following is NOT the main functions of an advanced automation system for the Wartsila 50DF?

A. Ensure that the minimum amount of pilot fuel can be injected

B. Allow optimum running conditions to be set dependent of fuel

C. Allow optimum running conditions to be set regardless of the ambient conditions

D. Ensure that the correct air-fuel ratio can be set

96. (l)For the Wartsila 46, what is the content of NO X emissions at 5%O2?

A. 500rog /Nm3

B. Beyond 500ing/Nm3

C. 2 g/KWh

D. Below 2 g/KWh

把答案写在相应的题号后：（第四套）姓名

1-5: 6-10: 11-15: 16-20: 21-25:

26-30: 31-35: 36-40: 41-45:46-50:

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76-80: 81-85: 86-90: 91-96:

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

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?

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