Why is gas-freeing rarely required for LPG cargo tanks? （）

Why is gas-freeing rarely required for LPG cargo tanks?

A.LPG is compatible with all cargos

B.LPG's high oxygen content makes it nonvolatile

C.Cargo tanks are inspected less frequently than on oil tankers

D.The cargo tanks are used for one type of cargo only

Generally speaking，the heavier cargo will go into the ______，distributing it evenly fore and aft，the lighter cargo will probably be placed in the ______．

A.Deep tanks/lower holds

B.Lower holds/tweendecks

C.Tweendecks/deep tanks

D.Deep tanks/tweendecks

Gas Carriers are generally referred to the cargo ships constructed or adapted and used for the carriage of ________ ．

A.LNG in bulk

B.LNG ＆ LPG in bulk

C.LPG in bulk

D.LNG ＆ LPG and other liquefied gas products

What is NOT required to be contained in the oil transfer procedures ________．

A.A line diagram of the vessel's oil transfer piping

B.The number of persons on duty during oil transfer operations

C.Any special procedures for topping off tanks

D.The location and capacity of all fuel and cargo tanks on the vessel

The capacity of the segregated ballast tanks shall be ______ determined that the ship may operate safely on ballast voyages without recourse to the use of cargo tanks for water ballast except as provided otherwise．

A.Such

B.As

C.So

D.Well

You are cleaning the tanks after carrying a cargo of crude oil. Which statement is TRUE?

A.Washing water should be recirculated if possible because it has the same electric potential as the cargo tank being cleaned

B.The hoses to portable cleaning machines should be disconnected before the machines are removed from the tank

C.The principal hazard with steaming cargo tanks is raising the ambient temperature above the flame point of the cargo residue

D.Steam cleaning and water washing are both capable of generating electrostatic charges within a tank

The system of valves and cargo lines in the bottom piping network of a tanker that connects one section of cargo tanks to another section is called a ______．

A.come-along

B.crossover

C.manifold

D.runaround

In no case shall ballast water be carried in cargo tanks，______ on those rare voyages when weather conditions are so severe that，in the opinion of the master，it is necessary to carry additional ballast water in cargo tanks for the safety of the ship.

A.besides

B.in particular

C.incase of

D.except

Valves on steam-smothering lines to cargo tanks shall be set with ______．

A.The master control valve shut and valves to individual cargo tanks shut

B.The master control valve open and valves to individual cargo tanks shut

C.The master control valve shut and valves to individual cargo tanks open

D.All valves open

Which spaces are required to be segregated from cargo tanks carrying grades A，B，C，or D cargoes ________．

A.Pump rooms

B.Enclosed deck spaces

C.Cofferdams

D.Navigation spaces