单选题When installed for bilge pumping or ballast duty, centrifugal pumps require a （） to remove air from the suction pipe.A air chamberB head lankC primerD prime mover

With UMS, when the engine room is unwatched will control the main engine

A.the bridge officer on watch

B.the chief engineer

C.the duty engineer

D.the duty motorman

Permission is kindly ______ about 1000 tons of clean sea water ballast，as and when required for trimming purposes．

A.requested to pump out

B.requested pumping out

C.requesting to pump out

D.requesting pumping out

Accidental flooding of the engine room bilges by the bilge main is prevented by( ).

A.stop-check valves installed in the bilge suction manifolds

B.using a positive displacement reciprocating bilge pump

C.installing educators in all bilge rose boxes

D.installing a swing check before each bilge valve

Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited ________．

A.It is required on all vessels

B.It may be located in a conspicuous place in the wheelhouse

C.It may be located at the bilge and ballast pump control station

D.All of the above

explain bilge and ballast pumping through ejector ?

A vessel in ocean service that does not have an approved means of processing oily bilge slops or oily ballast must have ______.

A.a fixed piping system for ballast discharge to a reception facility

B.a discharge outlet for the ballast system on each side of the weather deck

C.one portable adapter for a shore connection to the ballast line

D.All of the above

When the ships is going to enter into the harbor

A.change from heavy fuel oil to diesel oil for main engine

B.pumping out bilge water

C.change sea chest form high level one to lower level one

D.test emergency generator

Aboard damaged vessels, the MOST important consideration is preserving ______.

A.bilge pumping capacity

B.reserve buoyancy

C.level attitude

D.Instability