單項(xiàng)選擇題The size of the discharge ring used for the efficient operation of a disk type purifier is dependent upon the（）

A.rated capacity of that purifier
B.viscosity of the oil being purified
C.maximum design speed of that purifier
D.specific gravity of the oil being purified


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1.單項(xiàng)選擇題In a disk-type lubricating oil purifier, （）

A.the purifier driving gears are lubricated by the reclaimed
B.oil as it leaves the bowl all dirt and sludge are automatically discharged with the cooling water
C.sealing water must never be supplied until after oil is fed to the unit
D.deterioration of the bowl ring gasket will cause the purifier to lose its water seal

2.單項(xiàng)選擇題In sewage treatment, the term maceration refers to the process of （）

A.breaking up solid matter into fine particles
B.precipitating non-decomposed waste in a collection tank
C.chemically adjusting the sewage ph to 7-0
D.eliminating bacterium coli from the sewage

3.單項(xiàng)選擇題Which of the equipment listed is most effective in processing bilge slops for overboard discharge?（）

A.100PPM oily water separator
B.Assembling the lube oil purifier as a separator and aligning bilge overboard
C.A 15PPM oily water separator
D.A magnetic duplex strainer

4.單項(xiàng)選擇題If you heard a ‘crackling’ noise in centrifugal pump, the most probable cause of the problem would be（）

A.insufficient speed
B.cavitation
C.excess discharge pressure
D.excessive net positive suction head B

5.單項(xiàng)選擇題The valve which is most suited for regulating the flow through a pipeline is a （）

A.gate valve
B.globe valve
C.swing-check valve
D.plug-cock valve