单选题 The three largest categories of ships are container ships, ____ (for bulk goods such as grain, coal, ores, etc.) and tankers, which again can be divided into more precisely defined classes and types.

单选题 Since the buming or combustion takes place within the engine itself, the engine is known as____.

单选题 ____ speed engines operate in speed ranges from 300 to 1000 rpm.

单选题 Effective horsepower is the power developed by the ____ in the cylinder, but some of this is lost by friction within the engine.

单选题 Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in____.

单选题 For the diesel engine, the operation between two fuel oil injections is called a ____, which consists of a fixed sequence of events.

单选题 Where will the thrust forces from the propeller be transferred to through a thrust bearing?

单选题 Since most medium - speed diesel engines are non - reversible, what is usually used to cater for astern thrust?

单选题 The ____ engine is used for alternators and sometimes for main propulsion with a gearbox to provide a propeller of between 90 to 120 rpm.