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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?

Today, the primary source of propeller power is the______, and the power requirement and rate of revolution considerably depend on the ship's hull formation and the propeller design.

Gas turbines differ from steam turbines in that ______ is used to turn a shaft.

Why are slow-speed diesel engines especially tall?

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

The diesel engine is a type of ______which ignites the fuel by injecting it into hot, high pressure air in a combustion chamber.

______are most common as the propulsion engines in smaller ships, ro-ro and passenger ships. They are used widely as the electrical power generation engines in most merchant cargo ships.

Comparing with two stroke diesel engine, a disadvantage of a four-stroke/cycle diesel engine is ______.

Among the following, which one is not internal combustion engine?

______can be found on most medium to large merchant vessels even if the main engine is either a steam turbine or a 2-stroke crosshead engine.

Medium-speed engines operate in speed ranges from 300 to 900 r/min. The majority of medium-speed engines operate on the four-stroke cycle. They are most common as the propulsion engines in smaller ships, ro-ro and passenger ships. They are used widely as the electrical power generation engines in most merchant cargo ships. Four-stroke engines have more moving parts, are more complex and produce less power for equivalent weight compared to two-stroke slow- speed engines. Medium-speed engines do, however, offer several advantages which make them attractive for marine applications.The engines are compact-they are not long or high, this allows them to fit in engine rooms with low head space such as those in ro-ro ships. Fitted under the vehicle deck.Medium-speed engines use less oil than slow- speed engines. Recent developments have produced medium-speed engines capable of burning low quality heavy fuel oil. Engines of considerable power, to 25,000 kW and more, have been developed, allowing a large power system to be achieved with compact engines and engine room. This makes them suitable for passenger ship applications where the smaller the space provided for engines and machinery the more space is available for paying passengers.Most medium-speed diesel engines are non-reversible meaning that a controllable pitch propeller is usually employed to cater for astern thrust. Propulsion system compared to an equivalent ship with a matched slow-speed propulsion system operating at optimum conditions, when used as the primary source of power for propulsion applications medium-speed engines can be used in a number of configurations.

Which feature allows the medium-speed engine to fit in engine rooms with low head space?

Which feature makes medium-speed engine suitable for passenger ship where the smaller the space provided for engines and machinery the more space is available for paying passengers?

For medium-speed engines, why is a controllable pitch propeller employed to cater for astern thrust?

______ are large, especially tall, heavy and operate on the two-stroke cycle.

The reason why more and more of the large merchant vessels are being powered by medium-speed diesel engines is ______.

The diesel engine is a form of ______ engine similar to that used in a bus.

The diesel engines have played an important role in the shipping industry because of their improved engine efficiencies and designs compared to other forms of propulsion such as steam or gas ______.

The gasoline engine is similar to the diesel engine except that the former has ______.

A ______ is a small space left open between two bulkheads, to give protection from heat, fire or collision.

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