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The three main classes are the internal combustion engines, steam engines, turbine engines.
Steam engines presently produce more power than all other types of engines combined. Most steam engines take the form of the steam turbine engine. The steam turbine is responsible for generating about 86% of the electric power used on this planet. Reciprocating steam engines are still in use for limited applications, but are generally considered obsolete. Steam engines, either the piston or turbine type were used on most big ships until recently, and there are still a few steam locomotives about.
Where "were", not "was", and "engines", not "engine". There were hundreds of firms building steam engines of all types, sizes and applications in the last couple of hundred years, in the UK, USA, France, Germany, Italy, Russia... almost all industrial nations.
The most common method is to convert the heat into steam and use the steam to drive mechanical devices such as engines and turbines.
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If you have a DIFFERENCE of temperatures, you can convert part of that energy to other types of energy, including electricity. In fact, that is how many engines work - steam engines, gasolene engines in cars, and even nuclear reactors.
Engines can be made out of iron, steel and aluminum. Aluminum is lightweight, but is not as durable as the formerly listed metals.
There are a number of different types of car engines. Some of these engine types are Straight/Inline engines, V type engines, Rotary engines and diesel engines.
Which one? A large number of Victorian manufacturers built many thousands of steam-engines of all types and sizes between them! Most had no individual names, but had type-names, maker's / brand names and serial numbers. The only specifically-named engines were railway locomotives.
Turbojet, turbofan and turboprop. Also, turboshaft and ramjet.
Depends on how you want to catigorize them ... mobile or stationary piston or turbine condensing or non-condensing and weither the power comes from the steam pressure or from the vacumm you get when you condence the steam.
There are 3 different types of engines for a Nissan X Trail. However, all three engines are 4 cylinders.