单项选择题

At which of the following locations would a duplex pressure gage most likely be located?（）

A.Fuel oil service pump discharge
B.Fuel oil strainer
C.Fuel oil heater
D.Fuel oil flow meter

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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

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

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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