三管轮机英语41-48期经整理

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.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

2.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

3.Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?

A. Radiation

B. Conduction

C. Natural convection

D.

Contact directly

4.In a chilled water air conditioning unit using a reciprocating compressor, the

refrigerating effect of the primary refrigerant can be increased by ______.

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 compressor

5.In a general cargo crane, ______is fitted to lift the cargo load.

A. the slewing motor

B. the luffing motor

C. the hoisting motor

D. the fan moter

二. 关联题（关联题题干下有4个小题，每小题4个选项）

With many small package boilers, the automatic control sequence usually ensures that the boiler fire is initially ignited from a diesel oil supply, and changed over to the usual source when ignition is completed. With good management, to facilitate subsequent starting from cold, the fuel system of large boilers will have been flushed through with diesel oil when the boiler was on light duty immediately prior to being secured. When burning such diesel fuel it is essential for safety that only the correct (small) burner tip should be used. It should be kept in mind that if fire does not light, immediately shut off fuel and vent furnace.

Complete ignition of fuel in the furnace is essential. The burner flame, the smoke indicator and the funnel should be frequently observed. With satisfactory combustion, the flame should appear in candescent （白热的）with an orange

shade at the flame tip, and a faint brownish haze should show at the funnel. If on first ignition the flame is uncertain, badly shaped and separates from the primary swirler, momentary opening or closing of air register may correct.

75. Small package boilers will use ____C___ while being lit up.

A. the usual source of oil

B. fuel oil

C. diesel oil

D. mixture of fuel oil and diesel oil

76. After large boilers being secured, the fuel in the feeding line will be__C__.

A. the usual source of oil

B. fuel oil

C. diesel oil

D. mixture of fuel oil and diesel oil

77. If large boilers were not lit up, __B___.

A. feed water to normal level

B. stop fuel supply immediately and purge the furnace

C. light the boiler again

D. reset the burner

78. An indication for a good combustion is ___C___.

A. white smoke

B. brown haze in the funnel

C. orange flame tip

D. swirl oil spray

中华人民共和国海事局2007年第1期海船船员适任证书全国统考试题(总第42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。

二、单项选择题

1.A dirty diesel engine oil filter element can best be detected by ______.

A. visual inspection of the elements

B. the pressure drop across the filter

C. high lube oil sump temperature

D. decrease in oil viscosity from the filter

2.Which of the valves listed will be cycled from fully open to fully closed when the handle is turned 90 degree?

A. A rising stem gate valve

B. A globe stop valve

C. A check valve

D. A butterfly valve

3.Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?

A. hydraulic pumps

B. valves

C. hydraulic cylinders D hydraulic motors

4.Obviously, for a given fuel oil, its pour point is ______its cloud point.

A. lower than

B. higher than

C. as same as

D. better than

5.The ship security officer shall have knowledge and have received training,

taking into account the guidance given in Part B of______.

A. the ISM Code

B. the ISPS Code

C. the IBC Code

D. the

IGC Code

二、关联题（关联题题干下有4个小题，每小题4个选项）The clearly visible benefit of RT-flex engines is their smokeless operation at all ship speeds. This is achieved by the superior combustion performance with the common-rail fuel injection.

This system maintains the fuel injection pressure at the optimum level right across the engine speed range, ensuring optimum combustion under all operating conditions. In addition, a selective shut-off of single injectors at very low speeds and an optimized exhaust valve timing help to keep smoke emissions below the visible limit.

Sulzer RT-flex engines also have the advantage of steady running at lower speeds than engines with mechanically-controlled injection. They can run very steadily, and without smoking, at 10-12% of nominal speed, which for the RT-flex 60C is about 10-14rpm. This is made possible by the precise control of injection, together with the higher injection pressures achieved at low speed, and the sequential shut-off injectors.

6.According to above massage, the advantage of common-rail injection is______

A. smokeless operation

B. shockless operation

C. noiseless operation

D. no vibration operation

7.According to above massage, RT-flex engine can optimize______.① fuel injection pressure

② combustion ③ exhaust valve timing

A.①②

B. ①②③

C..③

D. ②

8.The key feature of the Sulzer RT-flex system is that it gives complete freedom in the _____ and operation of fuel injection and exhaust valve actuation.

A. metering

B. timing

C.control

D. using

9.The RT-flex engine can run at very low speed, this is made possible by following things except _______.

A. the precise control of injection

B. the higher injection pressures

C. the optimized exhaust valve timing

D. the sequential shut-off injectors

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。

三、单项选择题

1.A high rate of separation between oil and water is favored by ______.

A. large size of oil globule

B. low temperature

C. high viscosity

D. high flow rate

2.When a clarifier is running the impurities and water collect at the bowl ______.

A. center

B. periphery

C. inlet

D. upper parts

3.In a ordinary cargo crane, ______is fitted to rotate the crane.

A. the slewing motor

B. the luffing motor

C. the hoisting motor

D. the fan motor

4.A fuse that blows often should be replaced only with a fuse of ______.

A. the recommended current and voltage rating

B. higher current and voltage rating

C. higher current and lower voltage rating

D. lower current and higher voltage rating

5.The most likely place for a fire to start through the process of spontaneous

combustion is in _____.

A. an electrical switchboard

B. the pressure tanks

C. the fuel oil tanks

D. the oily rag bin

6.The term 'oil', as used in the Pollution Prevention Regulations , means ______.

A. fuel oil only

B. crude oil only

C. liquefied petroleum gas

D. petroleum oil of any kind

二、关联题（关联题题干下有4个小题，每小题4个选项）The cooling water in the HT(high temperature) circuit cools the cylinder liners, cylinder heads and turbocharger. From the pump water is supplied to the engine manifold which is cast in the engine block. From the manifold the water is distributed to all cylinder liner sections and from each liner upwards through the cooling water channels in the liner collars. From the liner collars further into the cylinder heads. In the cylinder head the water is forced by an intermediate deck to flow along the flame plate, around the valves to the exhaust valve seats and up along the fuel injector sleeve. From the cylinder head the water is discharged via a connection piece into the discharge manifold.

The return water from the cylinder heads and turbocharger is supplied to the HT air cooler.

In the first stage of this cooler, most of the heat from the charge air is extracted. The LT circuit water cools the charge air in the second stage. The necessary cooling for the LT water is gained from a central cooler. By controlling the LT water temperature to the inter-cooler the correct charge air temperature can be obtained.

For preheating purposes, a heater circuit with a pump and heater are connected in the HT circuit before the engine. Before starting, the HT circuit is heated till about 60℃ by a separate heater The pre-heating of the engine is, prior of starting up and loading on HFO, of utmost importance.

75. From the passage we know that the charge air temperature was controlled by _D___.

A. sea water from a central cooler

B. fresh water from a central cooler

C. fresh water from a HT circuit

D.fresh water from the LT circuit

76. The cooling water to cool the engine was forced ____A__ .

A. into the cylinder block and then upwards into the cylinder head

B. into the cylinder intermediate section and then upwards into the cylinder head

C. into the cylinder head and then downwards into the cylinder block

D. into the cylinder ends and then further into the cylinder intermediate

77. After the charge air is discharged into the HT air cooler, __B_____.

A. the charge air temperature will become higher

B. the charge air temperature will become lower

C. the HT water temperature will remain constant

D. the HT water temperature will become lower

78. Which of the following devices may be used to warm the engine prior to starting? A

A. A high temperature cooling water system.

B. A low temperature cooling water system.

C. A central cooler.

D. The second stage cooler.

轮机英语第45期

2. The ratio of the brake horsepower to the indicated horsepower of

a diesel engine is its _______

A. thermal efficiency

B. mechanical efficiency

C. brake thermal efficiency

D. volumetric efficiency

4. The greatest turbulence in a diesel engine cylinder is created by the ________

A. shape of the combustion chamber

B. fuel injection spray pattern

C. cylinder swept volume

D. degree of penetration of the fuel oil droplets

8. Compared to four-stroke/cycle engines, two-stroke/cycle 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

11.Shaker, circulation, and spray are the three general methods used in _______

A. pre-injection fuel oil treatment

B. lube oil filtration

C. lube oil purification

D. piston cooling

45. The delivery rate of a variable stroke axial piston hydraulic pump is controlled by varying the position of the _______.

A. slide block

B. tilting box

C. pintle

D. reaction ring

56. _______ is used to control, modulate, monitor and protect generator set.

A. Control panel

B. Load panel

C. Paralleling panel

D. Busbar

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46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。

四、单项选择题

4.A piston in a four-stroke/cycle diesel engine makes four strokes during each b A.crankshaft revolution B.mechanical cycle of operation

C.period of two combustion cycles

D.cycle of two events

11.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 turbocharger , inlet air velocity is increased in the d .

A.inlet nozzle ring

B.stationary diffuser passages

https://www.sodocs.net/doc/6118124186.html,pressor outlet volute

D.rotating impeller vanes

26.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 present

B.to cool the shaft

C.in place of mechanical seals

D.in place of lantern rings

28.Centrifugal pumps,used to handle hot liquids, must have a minimum flow through them under all operating conditions.This flow serves to a

A.prevent overheating and damage to pump rotating parts due to rubbing

B.maintain the net positive suction head of the pump

C.maintain hydraulic differential in the pump impeller passages

D.purge the pump of non-condensable vapors and gases

42. In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called d A.evaporation Bdistillation

C.dehydration

D.condensation

47.Proper internal lubrication of a hydraulic anchor windlass left idle for extended penods can be accomplished by a .

A.performing a chech run on the unit at regular intervals

B.testing the hydraulic fluid for proper PH

C.checking the reservoir for proper level

D.cleaning strainers at regular intervals

中华人民共和国海事局2009年第1期海船船员适任统考试题（总第47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70分，考试时间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88题，每题1分，第89题至96题，每题1.5分。

一、单项选择题

8. 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

40.When separating the lube oil without additive, it is usually working with hot water; the aim is to remove _____from it .

A. Acid

B. Oil sludge

C. Mechanical impurity

D. Salinity

45.Among the basic categories of equipment, which of the following are used to convert mechanical into hydraulic energy?

A. The hydraulic pumps

B. Valves

C. Hydraulic cylinders D Hydraulic motors

二、关联题（关联题题干下有4个小题，每小题4个选项）

第一组：

Stating Air System

The engine is started with compressed air of max 30bar. Minimum pressure required is 15bar. A pressure transmitter PT301 mounted on the starting air line before the main starting valve has an indicator in the instrument panel. The supply line from the staring air bottles is provided with a non return valve and a drain valve.

The solenoid valve is electrical(remote control) or manual (on the engine) operated and send after activation a pilot air signal to the

main starting air valve. Interruption of the control air doses the main starting air valve. After the main starting air valve is activated the air flows through the flame arresters to the starting air valves in the cylinder heads. The starting air distributor controls the timing of opening and closing of the starting air valves. On the moment the main staring air valve is operated also the governor booster is energized. The main starting air line is provided of a safety valve. Interlock valve is a safety device to avoid an engine start with engaged turning gear.

89.As the engine is started with compressed air, the correct sequence of the following devices being activated is___B___.1.solenoid valve 2. Starting air valve 3. Starting air distributor 4. Main starting air valve. https://www.sodocs.net/doc/6118124186.html,ernor booster

A. 1,5,4,2,3

B. 1,4,5,3,2

C. 1,4,3,2,5

D. 4,3,1,2,5

90.inderline sentence "the governor booster is energized" probably means______D_____.

A. The governor booster is supplied with electric power

B. Hydraulic oil is pumped into the governor booster

C. The governor starts to work before starting the engine

D.The governor booster is supplied with pressurized air before starting the engine

91.Which of the following components are attached to the air bottles?

A. A pressure transmitter PT 301

B. A non-return valve and a drain valve

C. A solenoid valve

D. A starting air distributor

92.When the engine is engaged with turning gear, ___D____can keep the engine from starting.

A.the control air

B. The solenoid valve

C. The main starting air valve

D.the interlock valve

第二组：

（1）The company should establish procedures to ensure that the ship is maintained in conform the provisions of the relevant rules and regulations and with any additional requirements which established by the company.

（2）In meeting these requirements the company should ensure that: (2.1) inspections are held at appropriate intervals

(2.2) any non-conformity is reported, with its possible cause, if known；

(2.3) appropriate corrective action is taken; and

(2.4) records of these activities are maintained.

(3)The company should establish procedures in its safety management system to identify equipment and technical systems the sudden operational failure of which may result in hazardous situations. The safety management system should provide for specific measures aimed at promoting the reliability of arrangements and equipment or technical system that are nor in continuous use.

93.This passage concerns ___D___.

A. The inspections of the ship and equipment

B. The reports of

non-conformities

C. The corrective actions

D. The maintenance of the ship and equipment

94.In(2.4) of this passage,"these activities" refers to the following activities except____A_____.

A. The establishment of any additional requirement

B. The corrective action taken

C. The inspections held

D. The reporting of any non-conformity

95.According to this passage, some particular equipment should have specific measures to promote its reliability, because_____B__.

A. It is not in continuous use

B. Its sudden failure may result in hazardous situations

C. Its stand-by arrangements may not be regularly tested

D. It may not be identified by the company's safety management system

96.This passage is probably taken from____D_______.

A. The MARPOL convention

B. The STCW convention

C. The ISPS code

D. The ISM code

中华人民共和国海事局

2009年第5期海船船员适任统考试题（总第48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88题，每题1分，第89题至96题，每题1.5分。

一、单项选择题

21. A bypass line provided around a waste heat auxiliary boiler in a diesel engine exhaust system, may be used to avoid boiler______ A. corrosion at low engine loads B. erosion at high engine loads

C. overload at high engine loads

D. scaling at all exhaust temperature

73. _____, where minor repairs are carried out with a ship in service, often during a stay in port. This may be remote from a ship repair site.

A. Voyage repairs

B. Routine docking

C. Damager repairs

D. Conversion

二、关联题（关联提题干下有4个小题，每小题4个选项）

第一组：

In a closed fresh water system, the engine jackets, the heat exchanger and the circulating pumps form a continuous circuit which is not open to the atmosphere. The cylinder jacket cooling water after leaving the engine passes to a sea water circulating cooler (heat exchanger) and then into the jacket water circulating pumps. It is then pumped around

the cylinder jackets, cylinder heads, exhaust valves and turbo-blowers However, provision has to be made for the expansion of the water due to the increase in temperature and due to small amounts of air which may enter the system and become entrained and for water make-up due to leakages. These are met by a small head tank which is open to the atmosphere and placed at a higher level than any other point in the system so that the small changes in volume can be accommodated by changing the level of the free surface of the water in the tank. The head tank is generally connected into the system at the pump suction, as this minimizes the chance of air being draw into the system at the pump. The minimum height of the head tank may be based on maintaining pressure of fresh water in the heat exchanger above that of the seawater to ensure that in the event of a small internal lock developing seawater cannot enter the fresh water system. Alternatively, it may be based on the need for a minimum pressure to be maintained within the jackets to avoid cavitations effects. The closed systems usually need vents if steam pockets or air locks are not to cause trouble. Vent pipes of small-bore tube are lead from any local high point in the system to the top of the head tank for the release of air from the cooling water.

A heater in the circuit facilitates warming of the engine prior to starting by circulating hot water. The temperature of the water entering the engine jackets is regulated by means of a by-pass across the jacket water cooler. The proportions of water passing through the cooler, or bypassing it are controlled by a three-way valve. The

temperature is usually adjusted to maintain a constraint outlet water temperature from the engine regardless of the load or speed or the temperature of the seawater. The piston cooling system may be an open system which employs similar components with the closed system, except that a drain tank is used instead of a head tank and the vent are then led to a hopper or tundish at the high point in the machinery space. The hopper serves as a visual flow indicator. A separate piston cooling system is used to limit any contamination from piston cooling glands to the piston cooling system only.

89. The loop of the jacket cooling water is ______

A. engine----heat exchanger----circulating pumps-----engine

B. heat exchanger-----engine----circulating pumps----heat exchanger

C. circulating pumps----heat exchanger-----engine-----circulating pumps

D. circulating pumps----engine-----heat exchanger----head tank

90. A small head tank is provided in the closed jacket cooling water system for _____ A. water expansion B. water make-up

C. warming of the engine

D. water expansion and make-up

91. The head tank is connected to the closed circuit at _____

A. engine inlet

B. pumps inlet

C. heat exchange inlet

D. engine outlet

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?

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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

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