单项选择题
Oil control rings used in two-stroke/cycle diesel engines are located near the bottom of the piston skirt in order to （）
A.increase the liner area covered by the oil film
B.maintain an oil film on the lower liner where scuffing is prevalent
C.keep excess oil away from intake and exhaust ports
D.help cushion piston skirt side thrust by providing a hydrodynamic oil wedge
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相关考题
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单项选择题
In describing basic diesel engine operation，the term ‘event’ refers to （）
A.the production of high pressure gases
B.the removal of expended combustion gases
C.the admission of air to the cylinder
D.all of the above -
单项选择题
To shut down a diesel engine after it exceeds the set maximum speed，which type of device listed should be used?（）
A.Speed limiting governor
B.Over-speed governor
C.Over-speed trip
D.Over-speed relay -
单项选择题
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
