轮机英语大证考试真题44期

轮机英语第44期考试题

一、单项选择题

1.The diesel engine is similar to the gasoline engine in that ______.

A.both of them are ignited by compressed air

B.both of them are the form of external combustion engines

C.both of them have spark plugs

D.the power is developed by the piston in the cylinder

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

3. The ignition quality of diesel fuel oil is indicated by the ______.

A. specific gravity

B. cetane number

C. viscosity

D. calorific value

4. How are the pressure and temperature affected in a diesel engine cylinder during compression?

A. Pressure and temperature decrease

B. Pressure and temperature increase

C. Pressure decreases and temperature increases

D. Pressure increases and temperature decreases

5. An aluminum piston has lower inertia and higher coefficient of ______compared to that of cast iron.

A. viscosity

B. twisting moments

C. inertia

D. thermal expansion

6. Each cylinder is closed at the top by a ______ , made of a special heat-resistant steel.

A. cylinder liner

B. coupling flange

C. cylinder cover

D. piston crown

7. The amount of fuel delivered by a helical plunger type fuel injection pump is controlled by ______.

A. rotation of the pump plunger

B. rotation of the pump barrel

C. varying the pump supply pressure

D. varying the pump return pressure

8. 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

9. Sacrificial zinc anodes are used on the saltwater side of diesel engine heat exchangers to ______.

A. reduce clectrolytic action on heat exchanger metals

B. keep heat transfer surfaces shiny and clean

C. prevent rapid accumulation of marine growth

D. provide a protective coating on heat exchanger surfaces

10. In a turbocharger, inlet air velocity is increased in the ______.

A. inlet nozzle ring

B. stationary diffuser passages

C. compressor outlet volute

D. rotating impeller vanes

11. Diesel engine cylinder air start valve timing is controlled by ______.

A. engine operating speed

B. an air manifold

C. a hydraulic distributor

D. the air distributor

12. If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will ______.

A. have a larger than normal dead band

B. produce excessive speed response to a load change

C. respond slowly to any change in engine load

D. stabilize engine speed at the new governor setting

13. A pyrometer is an instrument commonly used to measure ______

A. cylinder pressure

B. flame intensity

C. exhaust gas temperature

D. crankshaft axial alignment

14. Pump up the starting air reservoirs to their maximum pressure and ______ the air reservoirs and air system.

A. open

B. close

C. drain

D. vent

15. In reducing engine speed to an efficient propeller speed by the use of reduction gears, ______.

A. speed and torque are both reduced

B. speed is reduced and torque remains unchanged

C. speed is reduced and torque is increased

D. speed is something unchanged while torque is increased

16. Which of the following statements concerning fire-tube boilers is correct?

A. Combustion gases flow through the tubes

B. Flame impinge（撞击）on the tubes

C. Combustion occurs in the tubes

D. Water flows through the tubes

17. The safety valves should be tested and adjusted when the boiler survey is ______

A. completed

B. carried out

C. cleaned

D. steamed

18. When an auxiliary boiler is panting and emitting black smoke, you should_______.

A. increase the fuel oil temperature

B. decrease the fuel oil temperature

C. decrease the fuel oil supply pressure

D. increase the air supply

19. If the feed pump for an auxiliary boiler fails to deliver the feed water to the boiler ,the cause may be ______.

A. high steam pressure in the boiler

B. decrease the fuel oil temperature

C. abnormally high boiler water temperature

D. steam demand exceeding feed pump capacity

20. A vane pump belongs to ______ according to its working principle.

A. reciprocating pump

B. positive displacement pump

C. centrifugal pump

D. centripetal pump

21. The packing installed in the pump stuffing box is lubricated by _______.

A. gravity and feed oil cups

B. grease cups

C. hand during installation

D. leakage through the stuffing box

22. If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the ______.

A. packing gland

B. mechanical seals

C. lantern rings

D. wearing rings

23. Which of the listed conditions can lead to cavitation in a centrifugal pump?

A. Vapor pockets formed in the suction flow steam

B. Rough casing volute surfaces

C. Worn wearing rings

D. Heavy liquid in the flow stream

24. In a compression refrigeration plant, the hot, high pressure refrigerant gas is cooled by the sea water and becomes liquid in the ______.

A. compressor

B. condenser

C. throttle valve

D. evaporator

25. The temperature at which water vapor in the atmosphere begins to condense is called the ______.

A. dew point temperature

B. condensation temperature

C. psychometric temperature

D. absolute humidity temperature

26. In an air conditioning system, moisture is removed from the air by ______.

A. filters

B. separators

C. ducted traps

D. dehumidifiers

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

A. bubbling refrigerant

B. lowered operating temperature

C. overheating and oxidation

D. reducing the cloud or floc point

28. Coalescence is the breakdown of surface tension between oil droplets in an oil/water mixture, which causes them to join and ______in size.

A. expand

B. extract

C. increase

D. decrease

29. When started, a complete oily water separating unit is first filled ______. The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.

A. with dirty water

B. with clean water

C. by oily water

D. by mixed water

30. Which is the pollution prevention equipment?

A. booster pump

B. evaporator

C. incinerator

D. cooler

31. The ______is used to burn oil sludge.

A. clarifier

B. oily water separator

C. incinerator

D. distiller

32. In sewage treatment, the term …maceration? refers to the process of ______.

A. breaking up solid matter into fine particles

B. precipitating non-decomposed waste in a collection tank

C. chemically adjustment the sewage pH to 7.0

D. eliminating bacterium coli from the sewage

33. Which of the substances listed is satisfactorily removed from the fuel by a centrifugal oil purifier?

A. Carbon particles

B. Lube oil

C. Gasoline

D. Diesel fuel

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

A. oil has tendency to emulsify in the bowl

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

C. oil will be lost through the water discharge ports

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

35. The process of boiling seawater in order to separate it into freshwater vapor and brine is usually defined as ______.

A. dehydration

B. condensation

C. evaporation

D. dissolution

36. What type of valve is used to direct the flow of hydraulic fluid?

A. relief valve

B. direction control valve

C. stop valve

D. pressure control valve

37. 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

38. The drive motor will have a brake arranged to fail-safe, i.e. it will ______the load if power fails or machine is stopped.

A. lift

B. put

C. take

D. hold

39. On tank vessels with an electrically-driven capstan, the motor should be meggered periodically to test ______.

A. insulation resistance

B. eddy currents

C. capacitance

D. armature reactance

40. Overheating of a hydraulic system may be a result of _______________.

A. changing pump discharge pressure in response to normal load variations

B. a high oil level

C. incorrect fluid viscosity

D. continued slow re- circulation of the oil

41. Purging air from a hydraulic system is necessary when ______.

A. adding small amounts of oil to the system

B. the system has been overheated

C. the system has been drained and then filled with new oil

D. the system has been idle for a long period of time

42. A direct current passing through a wire coiled around a soft iron core is the description of a simple ______.

A. magnetic shield

B. electromagnet

C. piezoelectric ( 压电的)

D. electromagnetic domain

43. The operation of ______ two alternators requires the voltages to be equal and also in phase.

A. paralleling

B. series-mounting

C. running

D. controlling

45. The power factor of an AC generator operating singularly is determined by the ______.

A. connected load

B. prime mover speed

C. field excitation

D. generator?s rated voltage

46. After a ship enters service it is ______for the main bus-bar to be made dead.

A. usually

B. commonly

C. exceptional

D. unavoidably

47. A transformer in an electric circuit serves to ______.

A. generate its own electrical power

B. transform electrical energy into mechanical energy

C. increase or decrease circuit voltage as required

D. convert AC to DC

48. The separate supplies are connected in either star or delta formation. The star formation is most commonly used and requires ______ slip-rings on the alternator.

A. two

B. three

C. four

D. five

49. Most conducting materials such as copper, aluminum, iron, nickel, and tungsten(钨)______.

A. increase in resistance with increased temperature

B. increase in resistance with decreased temperature

C. decrease in resistance with increased temperature

D. increase in conductance with increased temperature

50. Which of the following statements represents the main difference between a relay and a contactor?

A. Contactors control current and relays control voltage

B. A relay is series connected and a contactor is parallel connected

C. Contactors can handle heavier loads than relays

D. Contactors are made from silver and relays are made from copper

51. The energy consumed by an AC motor, as strictly reactive power, is ______.

A. used to do mechanical work

B. used to establish the magnetic field of the motor

C. lost as heat generated by the windings

D. lost in doing work to turn the motor itself

52. The energy consumed by an AC motor, as strictly reactive power, is ______.

A. visual inspection for dirt accumulation

B. used to establish the magnetic field of the motor

C. low as heat generated by the windings

D. lost in doing work to turn the motor itself

53. Before starting the engine, the air bottle should be ______.

A. pumped up

B. loaded

C. discharged

D. closed

54. At the beginning of the watch the current operational parameters and the condition of all machinery should be verified and also the log readings should correspond with those ______.

A. noted by the bridge officer

B. told by last duty engineer

C. observed

D. in the instruction manual

55. “Movement of engine no longer required.” means ______.

A. Stop Engine

B. No Engine Revolution

C. Stand-by Engine

D. Finished With Engine

56. Which of the listed conditions can be considered as the single greatest cause of accidents?

A. Speed

B. Excessive knowledge or skill

C. Human error

D. Excitement

57. A class …C? fire would occur in ______.

A. bedding

B. pipe insulation

C. paint

D. a generator

58. If a fire occurs in the boiler room as a result of a leaking fuel line, you should FIRST ______.

A. notify the engineer on watch

B. isolate and secure the piping

C. throw and on the fire

D. extinguish the fire using a combination nozzle with applicator

59. At the earliest indication of fire aboard your vessel, you must FIRST ______.

A. locate the fire

B. determine which type of fire is burning

C. sound the alarm

D. fight the fire

60. If there has been a fire in a closed unventilated compartment it may be unsafe to enter because of ______.

A. unburned carbon particles

B. excess nitrogen

C. lack of oxygen

D. excess hydrogen

61. If you observe any situation which presents a safety or pollution hazard during fuel transfer operations, which of the following actions should be taken FIRST?

A. Close the valves at the transfer manifold

B. Notify the person in charge of the shore facility

C. Stop the transfer operation

D. Sound the fire alarm

62. Before replacing a piston you should check the rings to see that all clearances and gaps are within the permissible ______.

A. deflection

B. discrepancy

C. error

D. tolerance

63. ______ is an opening for supplying seawater to condensers, pumps, ect. Located in the hull below the waterline and having means for the attachment of the associated piping.

A. Sea chest

B. Supper

C. Scuttle

D. Sea port

64. 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.BRC

B. MCC

C. AUT-0

D. AUT-1

65. The International Oil Pollution Prevention Certificate is valid for a period of ______.

A. one year from the date of issue

B. five years from the date of issue

C. three years from the date of issue

D. four years from the date of issue

66. Which one is the …clear grounds? for a more detailed inspection?

A. paint peeling off the uptake

B. no operation procedures for the oil separator

C. one of ship?s certificates required is invalid

D. damaged sanitary pump

67. The Port State Control officer may witness a fire drill carried out by the crew assigned to these duties on the ______.

A. Navigation Log Book

B. Engine

C. Oil Record Book

D. Muster List

68. The ______Convention is the first to establish basic requirements on training, certification and watch-keeping for seafarers on an international level.

A. STCW78

B. STCW95

C. SOLAS74

D. SOLAS88

69. When the machinery spaces are in the periodic unmanned condition, ______ shall be immediately available and on call to attend the machinery space.

A. the chief engineer

B. the designated engineer from shipyard

C. the designated duty officer in charge of the engineering watch

D. the designated surveyor from classification society

70. The officer in charge of the engineering watch shall ensure that all machinery involved with the maneuvering of the ship can immediately be place in the ______ of operation when notified that the ship is in congested waters.

A. manual mode

B. automatic mode

C. remote mode

D. follow-up mode

71. Small oil spills on deck can be prevented from contaminating any waters by ______.

A. plugging all scuppers and drains

B. placing floating booms around the ship

C. regularly emptying all drip pans

D. thoroughly draining all bunkering hoses

72. When off loading garbage to another ship, your records must identify that ship by name and ______.

A. home port

B. operator?s name of record

C. official number

D. master?s name

73. The main objective of the SOLAS Convention is to specify ______for the construction, equipment and operation of ships, compatible their safety.

A. at most references

B. at least references

C. maximum standards

D. minimum standards

74. The objectives of the ISM Code are to ensure ______ ①safety at sea ②prevention of human injury or loss of life ③ avoidance of damage to the marine environment and to property

A. ①

B. ①②

C. ②③

D. ①②③

二、关联题（关联题题干下有4个小题，每小题4个选项）

The main starting valve (automatic valve) is operated by a pneumatic actuator, and similar actuator controls are fitted for slow turning and to the timing valves. The main starting valve can be locked shut and this must be done before the engine turning gear is engaged. When this valve is open, air passes through a non-return valve and flame arrester to the main manifold supplying pressure to the cylinder valves, one of which is fitted to each cylinder of the engine.

The cylinder air start valves are normally held closed by a compression spring together with cylinder pressure acting over the valve lid. Air from the manifold enters these valves where it forms a pressure balance between the underside of the valve lid and a balance piston of equal area on the valve spindle.

Consequently this does not cause the valve to open.

Cylinder valves are opened when operating air, transmitted from the distributor, applies pressure to the larger operating piston on the valve spindle. As the valve is forced open, starting air from the manifold enters the cylinder, applying pressure on the piston and causing the engine to rotate in the corresponding direction. To close the cylinder valves the connection from the distributor is opened to atmosphere, allowing the spring to close the valve and return the operating piston.

75. The timing valves ( in the first paragraph ) refer to ______.

A. the valves for slow running

B. fuel valves

C. the distributor

D. not mentioned

76. After the main starting valve opens, air will not supply to ______.

A. the flame arrester

B. each cylinder valve

C. a non-return valve

D. a pneumatic actuator

77. The balance piston used on a cylinder air start valve is to ______.

A. increase acting area

B. keep pressure balance and help the valve close before operating air applied

C. increase the force and help the valve open after the operating air applied

D. cause the valve to open

78. After the engine being started, the air in the distributor will ______.

A. be vented to open air

B. be leaded to the corresponding cylinder

C. be trapped until engine stops

D. return to air reservoir

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?

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

轮机英语历年真题43期

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