单选题Increasing differential pressure of an oil filter indicates that （）A it is dirtyB it is leakyC it has been renewedD all the above

For a continuous operation diesel engine, a duplex filter unit would be the best arrangement because

A.changing filter elements would not interrupt engine operation

B.filtering occurs twice in each pass of oil through the system

C.clogging will not occur

D.dropping pressure is half of that through a single filter unit

The pressure differential across a diesel engine lube oil system duplex filter should be checked to ________.

A.determine the need for filter cleaning

B.measure any change in oil viscosity

C.prevent damage to the filter

D.determine the need for batch filtration

A dirty diesel engine oil filter element can best be detected by ______.

A.visual inspection of the elements

B.the pressure drop across the filter

C.high lube oil sump temperature

D.decrease in oil viscosity from the filter

A.Low level is monitored on the drain tank and header tank.

B.If there is high differential the filters pressure across the circulating

pumps is alarmed

C.The lubricating oil purifier cannot take oil from the drain tank

D.If the sea water pressure falls, this also operates an alarm