单项选择题
A.obtain injection lag B.help mix fuel and air C.increase combustion pressure D.utilize higher injection pressures
The ratio of the brake horsepower to the indicate of a ...
单项选择题The ratio of the brake horsepower to the indicate of a diesel engine is its （）
A.thermal efficiency B.mechanical efficiency C.brake thermal efficiency D.volumetric efficiency
In order to keep excess oil from the intake ports in tw...
单项选择题In order to keep excess oil from the intake ports in two-stroke/cycle diesel engines, （）
A.wide compression rings are used B.oil rings are located above the piston C.chromium plating is used on all piston rings D.oil rings are located near the bottom of the piston skirt
An over-speed trip stops a diesel engine when the engin...
单项选择题An over-speed trip stops a diesel engine when the engine （）
A.runs out of fuel B.has low lubricating oil pressure C.exceeds a set maximum speed D.has high cooling water temperature
