更多"Lubricating oil for an engine is st"的相关试题:
[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]In addition to lubricating, cylinder oil assists in forming a gas seal and contains （） which clean the cylinder liner.
A. additives
B. water
C. grease
D. acid solution
[单项选择]（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.
A. Except for
B. Beside
C. Except
D. In addition to
[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]Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）
A. Splash
B. Gravity
C. Pressure
D. Bypass
[单项选择]For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.
A. oil spray
B. oil bath
C. oil control rings
D. drilled passage through the camshaft
[单项选择]Lubricating oil used in a diesel engine serves to（）
A. reduce the wear of bearing surfaces
B. cool the bearing surfaces
C. assist in sealing bearing surfaces
D. all of the above
[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 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]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]Main propulsion engine lube oil sumps should be constructed （）
A. so as to never be integral lube
B. with a sloped bottom
C. only of nonferrous, noncorrosive metals
D. with drain/return lines terminating just above or at the designed normal level
[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 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]Excessive circulation of the lubricating oil with the refrigerant in a refrigeration system will cause （）.
A. carbon deposits on the compressor suction valves
B. the evaporator temperature to increase
C. rapid corrosion of the thermal expansion valve
D. no operating problems
[单项选择]Excessive lubricating oil consumption in a running diesel engine can be caused by （）
A. clogged lube oil piping
B. excessive valve-guide clearance
C. high lube oil viscosity
D. low lube oil temperature
