更多"How often should the lubricating oi"的相关试题:
[单项选择]Diesel engine fuel oil contamination often results in （）
A. governor malfunctions
B. fuel injection system malfunctions
C. high cylinder lube oil temperatures
D. low intake temperatures
[单项选择]There should be a lubricating oil （） between the main beatings and the crankshaft.
A. film
B. cap
C. lacquer
D. shell
[单项选择]Lubricating oil should be changed on a heavy duty diesel engine when（）.
A. it gets dark in color
B. a sample rubbed between fingers feels thin
C. it has been in use for a specified interval
D. it no longer supports combustion
[单项选择]Diesel engine lube oil diluted with fuel oil is indicated by（）
A. decreased viscosity
B. decreased pour point
C. increased flash point
D. increased viscosity
[单项选择]Diesel engine lube oil can become contaminated as a result（）
A. the water produced during combustion
B. the sulfur in the fuel
C. unburned fuel oil
D. all of the above
[单项选择]Sludge formation in a diesel engine lube oil system is caused by（）
A. carbonization of oils from the combustion chambers
B. emulsions of lube oil and water
C. coagulation of unburned fuel below the piston rings
D. all of the above
[单项选择]One of function of diesel engine lubricating oil is to （）
A. induce carbon formation on cylinder walls
B. improve fuel penetration in the combustion space
C. form a friction reducing film between mating surfaces
D. lubricate the fuel injection
[单项选择]Permitting a diesel engine fuel oil day tank to run dry can cause （）
A. overheated injection pumps
B. water condensation in the cylinders
C. fuel dilution of the lube oil
D. air in the fuel system
[单项选择]Clogged diesel engine fuel oil filters can cause（）
A. loss of power
B. misfiring
C. low fuel oil pressure
D. All of the above
[单项选择]A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.
A. the engine was over filled
B. there might be a fuel leak
C. there might be a water leak
D. all of the above
[单项选择]A sudden decrease in the diesel engine lube oil viscosity could be an indication of（）
A. loss of additives from the lube oil
B. carbon deposits in the lube oil
C. excessive centrifuging
D. excessive fuel dilution
[单项选择]In a marine diesel engine the oil sump is （）.
A. just below the crankcase
B. the oil cup for the exhaust valve
C. the pan for collecting drain fuel oil
D. oil circulating pump
[单项选择]In a diesel engine lube oil system, which of the following parts should be lubricated first?（）
A. Camshaft beatings
B. Main bearings
C. Piston crowns
D. Cylinder walls
[单项选择]A dirty diesel engine oil filter element can best be detected by （）.
A. visual inspection of the elements
B. the pressure drop across the filter
C. high lube oil sump temperature
D. decrease in oil viscosity from the filter
[单项选择]The ignition quality of a diesel fuel oil is indicated by the （）
A. specific gravity
B. cetane number
C. viscosity
D. calorific valve
[单项选择]The cetane number of a diesel fuel oil indicates its（）
A. Viscosity
B. acid content
C. heating value
D. ignition quality
[单项选择]Diesel oil may be used to cool （） of a diesel engine.
A. cylinders
B. exhaust valves
C. pistons
D. fuel valves
[单项选择]For a main diesel engine the lube oil in the bearings is drawn from （）, usually located in the bedplate.
A. a gravity tank
B. a sump
C. a vessel
D. a bottle
[单项选择]Burning diesel oil should be treated as which class of fire?（）
A. Class "A"
B. Class "B"
C. Class "C"
D. Class "D"
