大管轮轮机英语综合(33-48期)(2)

A. liquid strainer B. liquid receiver C. saltwater condenser D. evaporator

34．The fire pumps must be capable of delivering a total quantity of water at a defined head , not less

than______ of the total bilge pumping capacity.

A. one-third B. two-thirds C. one-fourth D. two-fourths

35．Which of the following factors will have the greatest effect on the heating load within a

conditioned space?

A. Solar gain B. Infiltration and ventilation air

C. Occupants inside the space D. Entertainment equipment within the space

36．On commonly used ships, if two A.C. generators are operated in parallel, the load is distributed

evenly by ______.

A. varying the D.C. exciter voltage B. varying the reluctance of the air gap

C. regulating the speed of prime mover D. shorting out part of the armature windings

37．Which of the listed sections of an emergency switchboard is used to supply power for alarm

signals under emergency conditions?

A. The generator and bus transfer section B. The 450 volt, 60 cycle, 3 phase bus C. The 120 volt, 3 phase, 60 cycle bus D. The 24 volt DC bus

38．Which of the following should be the FIRST step in removing a generator from parallel operation?

A. Trip the generator off the switchboard. B. Turn off all electrical equipment.

C. Remove the load from the 'off going' generator.

D. Increase the cycles of the generator staying on the line.

39．Which of the listed devices is used to measure pressure and convert it to an electrical signal?

A. Transducer B. Reducer C. Transformer D. Rectifier

40．An indicator on the main switchboard should show ______the emergency battery is in service or

not.

A. which B. when C. weather D. whether 41．The number of cycles per second occurring in AC voltage is known as the ______.

A. phase angle B. frequency C. wave form D. half mode

42．While on watch in the engine room, you hear a continuous sounding of the general alarm. Which

of the following actions should you take? A. Make an entry in the official logbook.

B. Open the master control valves on the fixed CO2 system. C. Start the fire pump and check discharge pressure. D. Secure auxiliary condenser overboard discharge.

43．The additional mark ______ in the Classification Certificate for Machinery represents that

personnel are watching at engine assembly control station and monitoring all machinery and electronic devices.

A. BRC B. MCC C. AUT-0 D. AUT-1

44．If the atomizer holes are enlarged beyond the maker's recommended size , the atomizer must be

______.

A. repaired B. replaced C. replenished D. repeated

45．In a diesel engine, an extremely leaking exhaust valve can cause ______.

A. misfiring B. pre-ignition C. interrupted scavenging D. reduced scavenging

46．One cylinder of a diesel engine is persistently knocking and does not cease when the fuel supply

to that cylinder is secured. Which of the following problems may be the cause? A. Low loading of the cylinder. B. Excessive cooling of that piston.

C. Sluggish ring action on the piston. D. A mechanical defect in a working part. 47．Poor combustion in a diesel engine can be caused by ______.

A. high compression pressure B. low intake air temperature C. low exhaust pressure D. high scavenge air temperature

48．Any increase in the exhaust back pressure of a four-stroke/cycle diesel engine will ______.

A. reduce engine horsepower output B. aid in silencing the exhaust noise

C. increase the mean effective pressure D. contribute to effective cylinder scavenging 49．Hearing a strong noise, ______at once.

A. the engine stopped B. the engine was stopped C. he stopped the engine D. he had stopped the engine

大管轮轮机英语综合

50．Fix the fuel injector into______after repair.

A. the cylinder liner B. the cylinder cover C. the cylinder jacket D. the piston 51．Lower suction pressure of a pump may be caused by ______.

A. too much air in the pipe line B. closed inlet valve C. empty tank D. leaky pipe

52．Diesel engine exhaust temperatures may be used to indicate ______.

A. leaking exhaust valves B. an overloaded cylinder C. a clogged injector nozzle D. all of the above.

53．The indications of a scavenge fire are excessive black smoke, ______ and peeling from scavenge

trunking.

A. turbo-chargers surge B. spark seen from the drains C. paint blistering D. all above are right 54．It is well known that the whole power distribution of the ship s electrical services mainly depend

on the______.

A. sub-boards B. main switchboards C. emergency switchboards D. distribution boards 55．Combustion knock can occur in the cylinders of a diesel engine under any condition permitting

______.

A. a shortened ignition delay period B. a lean fuel/air mixture

C. excess fuel in the combustion chamber D. rapid vaporization of injected fuel droplets

56．Oil mist detectors are usually used on board to detect oil mist density within ______.

A. the engine crankcase B. the engine scavenge boxes C. drain tanks D. fuel tanks

57．Before doing maintenance on electrical equipment, you should ______.

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