更多"The lubrication to the cylinders af"的相关试题:
[单项选择]Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A. operated manually once an hour
B. operated until the engine has started
C. placed into operation only at maximum load
D. adjustable to meet lubrication requirements
[单项选择]What could be a result of insufficient lubrication of lifeboat winches and davits?（）
A. Moisture accumulation in winch motor damaging the electrical wiring
B. Freezing of gears in cold weather
C. Corroding of sheaves on the davits so they will not rotate
D. All of the above
[单项选择]Cylinder lubrication oil for low speed main propulsion diesel engines is admitted to each cylinder during （）.
A. the power stroke
B. the compression stroke
C. low load operation only
D. periods of standby
[单项选择]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. acids
B. additives
C. heat
D. gear
[单项选择]During repair,lubrication lines and orifices must be （）.
A. taken away
B. engaged
C. connected
D. sealed off
[单项选择]Boilers and cylinders are（）.
A. raw metallic products
B. finished metallic products
C. consumable products
D. Manufactured goods of large Size
[单项选择]The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to （） the acid conditions.
A. invade
B. provide
C. detergent
D. neutralize
[单项选择]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 continuously
B. positive feed lubricators are installed on all bearings of four-stroke engine, whereas as a splash feed system is used on tow-stroke engine
C. four-stroke engines usually utilize a heavier grade of oil than tow-stroke engines
D. Low-stroke engines usually consume less lube oil than four-stroke engines
[单项选择]Generally the function of lubrication is to form of a film of lubricant between any two surfaces that have relative （）, so that surfaces dont get touch with each other.
A. gravity
B. motion
C. ratio
D. density
[单项选择]The main function of the lubrication system in to enable （） of a film of oil between the moving parts.
A. the information
B. the formation
C. the scatter
D. the friction
[单项选择]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
[单项选择]CO2 cylinders equipped with pressure actuated discharge heads will discharge automatically when（）.
A. the discharge valve is open
B. the control box glass is broken
C. pressure from the control cylinders is detected
D. the control cylinders have been completely discharged
[单项选择]
Exhaust temperature increases in all cylinders, the possible cause may be（）
(1) increased scavenging air temperature
(2) air in fuel pumps and fuel valves
(3) fouling of air and gas passages
A. (1)+(2)
B. (1)+(3)
C. (2)+(3)
D. (1)+(2)+(3)
[单项选择]Successful combustion inside the cylinders of a diesel engine is dependent upon （）.
A. fine atomization
B. high temperature
C. good mixing of fuel and air
D. all of the above
[单项选择]Cylinders of marine diesel engines are normally cooled by （）.
A. sea water
B. fine mineral oil
C. sanitary water
D. fresh water
[单项选择]In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.
A. lube oil pump suction line
B. lube oil pump discharge line
C. bottom of the lube oil sump
D. outlet from the lube oil header
[单项选择]Oil pressure in the lubrication system is （） the static sea water head to ensure that sea water （） the stem-tube.
A. lower than；can lubricate
B. lower than；can cool
C. higher than；can enter
D. higher than ；cannot enter
[单项选择]Oil pressure in the lubrication system is（）than the static sea water head to ensure that sea water cannot enter the sterntube in the event of seal failure.
A. higher
B. lower
C. very higher
D. very lower
[单项选择]It is well known that good lubrication will （） the bearings from becoming overheated.
A. present
B. prevent
C. avoid
D. provide
