单项选择题
The function of lubricating oil is to （）
A.maintain even distribution of bearing wear
B.maintain a constant oil temperature
C.maintain a pressurized film between moving surfaces
D.remove entrained water
点击查看答案&解析
相关考题
-
单项选择题
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 -
单项选择题
The ash content of a fuel oil is significant to the operating engineer because it （）
A.is an indication of the amount of noncombustible material present in the oil
B.indicates the quantity of energy released by burning a unit amount of the fuel
C.is useful for determining proper atomization temperatures
D.reflects the overall thermal efficiency of the fuel oil service system -
单项选择题
The shape of a cam on a diesel engine determines the valve’s （）
A.point of opening
B.speed of opening
C.lift from its seat
D.all of the above
