题目内容

( )allows the engines to be placed wherever is the most suitable, as they no longer have to be aligned with reduction gearing and shafting as is the case with conventional installations.

A. Diesel engine propulsion
B. Electrical propulsion
C. Steam engine propulsion
D. Gas turbine propulsion

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Of all types of commercial internal combustion engines now built, which one usually gives the best performance,and hence it is quite commonly used in marine applications,especially in larger sizes?( )

A. Steam engine.
B. Gasoline engine.
C. Gas turbine.
Diesel engine.

What is the application of high-speed diesel engines at sea?( )①They are used for emergency power generation to small applications; ②They are used forelectrical power generation on board ships driven by medium-speed propulsion engines;③They can be used on tugs,ferries and barges, etc. as main engines.

A. ①②.
B. ②③.
C. ③.
D. ①②③.

The maintenance period of the engine depends principally on( )

A. the working condition
B.the engineer's experience
C. operational schedule
D. the engine size

Modern diesel engines are run on( ),a fuel whose grade lies between that of HFO andMDO.

A. diesel oil
B. Intermediate Fuel Oil (IFO)
C. gas oil
D. residual oil