單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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