displacement value

The amount of fluid delivered by a positive displacement pump can be regulated by _____.

A.throttling the pressure line

B.changing the speed of the driving rotor

C.either A or B

D.None of the above is tree

When displacement increases，the free surface corrections for slack tanks ______．

A.increase

B.decrease

C.are directly proportional

D.remain unchanged

The righting moment can be determined by multiplying the displacement by the ______．

A.vertical center of gravity（KG）

B.longitudinal center of gravity（LCG）

C.righting arm（GZ）

D.center of gravity（CG）

Deadweight is ________ ．

A.the tonnes of the displacement of a vessel in water of a specific gravity of 1．025 at summer load water line

B.the difference in tonnes between the displacement in salt water at summer load waterline and the light weight of the vessel

C.the cargoes in tonnes that can be loaded in a vessel at summer load water line

D.the bale capacity in cubic meters of a vessel

A vessel’s KG is determined by ______.

A.dividing the total longitudinal moment summation by displacement

B.dividing the total vertical moment summation by displacement

C.multiplying the MTl by the longitudinal moments

D.subtracting LCF from LCB

Which statement is NOT true？

A.While displacement pump works, volume of the working chamber will increase and decrease alternately

B.A gear pump always has two gears

C.Any vane pump will have a rotor within a ring

D.A balanced vane pump has two outlet ports and they are positioned symmetrically

Displacement refers to the ______.

A.cubic capacity of a vessel

B.deadweight carrying capacity of a vessel

C.gross tonnage of a vessel

D.number of tons of water displaced by a vessel afloat