单选题When a clarifier is running the impurities and water collect at the bowl （）.A centerB peripheryC inletD upper parts

A centrifuge arranged to separate two liquids is known as

A.an oily water separator

B.a purifier

C.a centrifugal compressor

D.a clarifier

When a clarifier is running the impurities and water collect at the bowl _____.

A.center

B.periphery

C.inlet

D.upper parts

_____, water turns into ice.

A、When freezing

B、When frozen

C、When it has been frozen

D、When freezes to it

The purpose of a bilge well is to ______．

A.Afford access to the shell through the double bottoms

B.Collect water to be pumped out

C.Provide access for the pneumercator

D.Provide a base line for sounding measurements

The separation of impurities and water from ______is essential for good combustion of diesel engines.

A.lube oil

B.fuel oil

C.turbine oil

D.grease

When is the density of the water required to be logged in the logbook of a ship?

A.Any time the vessel moves from water of one density into waters of a different density

B.Prior to getting underway when the vessel is floating in fresh or brackish water

C.Only when the vessel moves from fresh water into salt water

D.The density of the water is not required to be logged in the unofficial logbook

If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the

A.oil has a tendency to emulsify in the bowl

B.purifier will act as a clarifier at the discharge ring

C.oil will be lost through the water discharge ports

D.oil solids will be deposited only at the intermediate top disk

What prevents water running along the shaft of a leaking centrifugal pump from entering the shaft bearing ________．

A.Shaft seal

B.Water flinger

C.Drain hole

D.Lantern ring