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单选题
Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）
A
bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversed
B
bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversed
C
the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine
D
two-stoke/cycle diesel engines require more complicated lubrication piping
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更多 “单选题Proper lubrication of the main bearing is more easily obtained in a single acting four-stroke/cycle diesel engine than in a single acting two-stroke/cycle diesel engine because （）A bearing pressure in a four-stroke/cycle acting single diesel engine is continually reversedB bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversedC the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engineD two-stoke/cycle diesel engines require more complicated lubrication piping” 相关考题
考题
Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because________.A.The direction of pressure on the journal in four-stroke engine is continuouslyB.positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineC.four-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesD.Low-stroke engines usually consume less lube oil than four-stroke engines
考题
Radar is not only to obtain ______, but also to measure their distance away from you.A.brightness of objectsB.color of targetsC.shape of targetsD.bearing of objects
考题
The most crucial time for any bearing with regards to lubrication isA.during low loadsB.after proper oil viscosity is reachedC.during startingD.after cleaning filters
考题
The common method of applying oil to the cylinder walls is by means of small pump assembled in units, known asA.mechanical lubricatorB.lubrication functionC.forced feed systemD.bearing lubrication
考题
Lubrication for the main reduction gears used with diesel engines is usually supplied byA.oil from the main engine sumpB.an independent lube oil systemC.the stern bearing head tankD.the stem bearing sump tank
考题
Adjust ______by means of lead wire.A.the clearance of the main bearingB.the diameter of main bearingC.the gap of main bearingD.the tolerance of main bearing
考题
单选题On a large low-speed main propulsion diesel engine, lower main bearing wear is usually measured by using a/an （）A
dial indicatorB
outside caliperC
bridge gaugeD
tram rod
考题
单选题（）is an equipment used to detect the presence of ships ,buoys,coast and many other targels and to obtain range and bearing of these targets.A
The marine sextantB
The chronometerC
The echo sounderD
The radar
考题
单选题Adjust （） by means of lead wire.A
the clearance of the main bearingB
the diameter of main bearingC
the gap of main beatingD
the tolerance of main bearing
考题
单选题In the management of the shafting, because（） carry heavy load and caused high temperature easily, it should be paid attention.A
the bearing near to the diesel engineB
the intermediate bearing near to the thrust bearingC
the intermediate bearing near to the sterntubeD
the bearing located at the middle of the diesel engine and the sterntube
考题
单选题In an engine with a pot-shaped piston, some lubricating oil from the main bearing will pass along a drilled passage in the crankshaft to the bottom end bearing and then up a connection rod to the （）.A
crossheadB
crankpinC
crank journalD
gudgeon pin
考题
单选题Which of the listed bearing types is an example of a solid bearing?（）A
Piston wrist pin bushingB
turbine bearingC
Spring bearingD
Diesel engine main bearing
考题
单选题The most crucial time for any bearing with regards to lubrication is （）A
during low loadsB
after proper oil viscosity is reachedC
during startingD
after cleaning filters
考题
单选题The main bearing metal is a lining （）.A
inside the bearingB
outside the bearingC
covering the crankshaftD
none of the above
考题
单选题Proper lubrication of the main bearings is more easily obtained in a single acting, four-stroke/cycle diesel engine than in a tow-stroke/cycle diesel engine because（）.A
The direction of pressure on the journal in four-stroke engine is continuouslyB
positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engineC
four-stroke engines usually utilize a heavier grade of oil than tow-stroke enginesD
Low-stroke engines usually consume less lube oil than four-stroke engines
考题
单选题The main function of the lubrication system in to enable （） of a film of oil between the moving parts.A
the informationB
the formationC
the scatterD
the friction
考题
单选题Measure （） by means of lead wire.A
the clearance of the main bearingB
the play of the miler bearingC
the gap of the main bearingD
the tolerance of the main bearing
考题
单选题A squeeze-grip type carbon dioxide portable fire extinguisher has been partially discharged. It should be（）.A
labeled empty and recharged as soon as possibleB
replaced in its proper location if weight loss is no more than 25%C
replaced in its proper location regardless of weightD
replaced in its proper location if weight loss is no more than 15%
考题
单选题The oil quantity for bearing lubrication should be applied in such an amount as to be sufficient to carry away the （） caused by the friction at the bearings.A
acidsB
additivesC
heatD
gear
考题
单选题The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）A
main bearing shellsB
main bearingC
steelD
bearing metal
考题
单选题To guarantee that a reduction gear bearing is receiving proper oil supply, you should check the （）A
lube oil temperature at the cooler outletB
lube oil strainer magnets bearingC
lube oil temperatureD
lube oil pressure to the bearing
考题
单选题To determine the main bearing clearance of a propulsion diesel engine, you should measure the main bearing shell using a ball anvil outside micrometer and measure the crankshaft journal using a/an （）A
telescopingB
ring ‘snap’ gaugeC
inside vernier caliperD
outside micrometer
考题
单选题While inspecting the main bearings on a diesel engine you find impregnated dirt and scratches in the bearing surface you would, therefore, suspect that （）A
the bearing had been overheatedB
water was present in the oilC
the lube oil was not being properly filteredD
the maximum allowable bearing pressure had been exceeded
考题
单选题The design of （） is similar to that of the main bearing.A
the block bearingB
the camshaft bearingC
the connecting rod small end bearingD
the connecting rod large end bearing
考题
单选题Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?（）A
Correct the cause of the scoring and repair the sleeve or replace with a new oneB
Reassemble the unit and provide more water leak off for proper lubricationC
Check for parallel alignment of the sleeve radial faces to the sleeve boresD
Reassemble the unit and adjust the governor to obtain a slower speed
考题
单选题Two important considerations for the proper lubrication of a diesel engine include the delivery of the oil in sufficient amount and the （）.A
cetane numberB
pour pointC
viscosity temperatureD
quality of the oil
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