Which statement is NOT true？A.While displacement pump works, volume of the working chamber

Cooling water is circulated through______in some injectors.

A.the nozzle

B.the nozzle tip

C.the internal passages

D.the fuel re-circulated

第一组

Older loop scavenged engines may have a single injector mounted centrally in the cylinder head. Because the exhaust valve is in the center of the cylinder head on modern uniflow scavenged engines the fuel valves (2 or 3) are arranged around the periphery of the head. The pressure at which the injector operates can be adjusted by adjusting the loading on the spring. The pressures at which the injectors operate vary depending on the engine, but can be as high as 540 bar. Some injectors have internal cooling passages in them extending into the nozzle through which cooling water is circulated. This is to prevent overheating and burning of the nozzle tip. Injectors on modern engines do not have internal cooling passages. They are cooled by a combination of the intensive bore cooling in the cylinder head being close to the valve pockets and by the fuel which is re-circulated through the injector when the follower is on the base of the cam or when the engine is stopped. As well as cooling the injector, re-circulating the fuel when the engine is stopped keeps the fuel at the correct viscosity for injection by preventing it from cooling down. Fuel injectors must be kept in good condition to maintain optimum efficiency, and to prevent conditions arising which could lead to damage within the cylinder. Injectors should be changed in line with manufacturers&39; recommendations, overhauled and tested. Springs can weaken with repeated operation leading to the injector opening at a lower pressure than designed. The needle valve and seat can wear which together with worn nozzle holes will lead to incorrect atomization and dribbling.

Modern uniflow scavenged engines have______.

A.a single injector mounted in the center of the cylinder head

B.several injectors mounted around the external boundary of the cylinder head

C.a single injector mounted at the external boundary of the cylinder head

D.several injectors mounted in the center of the cylinder head

The fire drill must, as far as practicable, be conducted as if______.

A.there is a minor emergency

B.there is an actual emergency

C.there were a minor emergency

D.there were an actual emergency

、Disposal of oil residues. II、 Internal transfer of fuel oil

A.I only

B.II only

C.both I and II

D.neither I nor II

The installation and provision of fire fighting equipment is mainly subject to ___.

A.ISM code

B.ISPS code

C.IBC code

D.FSS code

Each ship shall carry on board a ship security plan approved by______.

A.the chief engineer officer

B.the master of the ship

C.the manager of the company

D.the Administration

l?

A.Fire pump and lube oil pump

B.Lube oil pump and distilling plant

C.Distilling plant and shaft alley door

D.Shaft alley door and fixed CO2 release

Bulk (IGC Code) of______.

A.SOLAS

B.MARPOL

C.STCW

D.Ballast Water convention

reas from ships, the disposal into the sea of all plastics is______.

A.welcome

B.admitted in some special sea areas

C.prohibited

D.acceptable

In cleaning up an oil spill, the use of chemical agents would______.

A.absorb the oil for easy removal

B.remove the oil from the water

C.disperse or dissolve the oil in the water

D.not affect the oil