单选题What is a characteristic of all centrifugal cargo pumps? （）A They are self-primingB Decreasing the speed of rotation will decrease the discharge pressureC Opening the discharge valve wider will increase the discharge pressureD All of the above

What should be done after putting down the ramp on a Ro-Ro vessel，prior to loading or discharging cargo ________．

A.Turn on red cargo light

B.Turn on ventilation for cargo holds

C.Call out the deck department for all hands

D.None of the above

A bonding cable should be connected for cargo operations aboard a tank vessel as soon as the ______．

A.Cargo has been loaded or discharged

B.Cargo hose is connected

C.Cargo pumps are started

D.Vessel is ready to handle cargo

A segregated ballast system is a system where

A.all ballast is processed through the oily water separator

B.ballast is taken on and discharged through a separate main deck

C.ballast and cargo tanks are separated by cofferdams

D.all ballast lines, tanks, and pumps are independent of those used for oil

You are on a tanker discharging oil．When all of the oil that the main cargo pumps can handle is pumped out of a tank，the remainder is ______．

A.Stripped out and pumped directly ashore into the mainline as the remaining cargo tanks are pumped out with the main pumps

B.Stripped to one tank and then pumped out with the main pumps

C.Stripped out and pumped directly ashore after all the tanks have been emptied by the main pumps

D.Gravitated to the centers from the wings and pumped out with the main pumps

What entry on a dangerous cargo manifest concerning the classification of a cargo is correct ________．

A.Class 8

B.Class 3 - flammable liquid

C.Division 2.2 - nonflammable gas

D.All of the above are correct

What is the function of wearing rings found on some centrifugal pumps ________．

A.Absorb erosion of high velocity discharge stream

B.Seal pump shaft against entry of air

C.Isolate the outlet side from the inlet side

D.Dampen the turbulent discharge flow

Regulations require that cargo pumps in tankers carrying grade D liquid cargo shall be isolated from sources of vapor ignition by ______．

A.Cofferdams

B.Gastight bulkheads

C.Passageways or living quarters

D.General cargo spaces

______ is just to put it ______ and notify me as to where and how the cargo was damaged．

A.What you ought to do with the damaged cargo／aside

B.What you should do with the damaged cargo／beside

C.What will you do with the damaged cargo／besides

D.What have you to do with the damaged cargo／side by side

What is a requirement for remote manual shutdown stations for internal combustion engine driven cargo pumps on tank barges ________．

A.They must be conspicuously marked

B.They must be located at least 10 feet from the engine

C.There must be at least two such shutdown devices

D.The valve rods shall be fitted with stuffing boxes

Centrifugal pumps have what advantage（s）over reciprocating pumps ________．

A.They are less expensive

B.They are smaller for equivalent pumping ability

C.They pump more cargo in less time

D.All of the above