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

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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

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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

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The primary purpose of oil control rings on a diesel piston is to（）

A.provide a reservoir for cylinder lubrication
B.pump oil into the combustion space for cylinder cooling
C.prevent excessive lubricating oil consumption
D.allow hydraulic oil film formation on the cylinder