更多"The main function of the lubricatio"的相关试题:
[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]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]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]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]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 tie rods in the construction of large, low speed diesel engines is to（）.
A. stiffen the bedplate in way of the main bearings to increase the engines longitudinal strength
B. accept most of the tensile loading that results from the firing forces developed during operation
C. mount the engine frame securely to the hull to prevent shaft coupling misalignment
D. connect the crosshead solidly to the piston rod
[单项选择]The main function of piston compression rings is to （）
A. prevent excessive cylinder liner wear
B. reduce friction losses in the engine
C. seal the space between the piston and the liner
D. limit upward flow of lube oil into the combustion space
[单项选择]The main source of fuel injection system malfunctions is （）
A. improper adjustments
B. contaminated fuel
C. coated fuel lines
D. excessive vibration
[单项选择]In the fire main system, quick cleaning strainers are located at the（）.
A. pump suctions
B. pump discharge
C. fire hydrants
D. hose nozzle
[单项选择]（）is not the main function of CCS.
A. ship products survey
B. notarization survey
C. ship safety inspection
D. counseling service and publishing ship name list
[单项选择]A re-heater in an air conditioning system functions to （）.
A. control inlet air temperature
B. control inlet air volume
C. maintain relative humidity at 15%
D. restore conditioned air temperature to a comfortable level
[单项选择]The main function of the drawworks on a ship is to（）.
A. transport tubulars from the pipe racks to the derrick floor
B. maintain constant tension on the marine riser
C. store and secure the excess drill line
D. lower and hoist the drill string into and out of the drilled hole
[单项选择]How does an inert gas system on a tanker function to prevent explosions in cargo tanks? （）
A. De-energizes the "charged mist" effect
B. Maintains a positive pressure on the vent header to cool the flammable vapors
C. Inert gas filters out the flammable vapors from the cargo tank spaces
D. Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit
[单项选择]Each inert gas system gas main must have an automatic shut down valve at the outlet of the gas production plant. This valve must close automatically upon（）.
A. cargo pump failure
B. blower failure
C. deck seal low water level
D. low inert gas temperature
[单项选择]The main function of the core of a wire rope is to（）.
A. give flexibility
B. support the strands laid around it
C. allow some circulation around the strands
D. allow lubrication inside the rope
[单项选择]（）is main emergency fire system in all merchant ships.
A. CO2 system
B. Foam system
C. Dry power system
D. Water supply system
[单项选择]Each part of the fire-main system located on an exposed deck must be（）.
A. protected against freezing
B. locked to prevent theft
C. numbered sequentially
D. pressurized at all times
