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An engine
which receives energy from the combustion of fuels and
converts it into mechanical work is known as Heat engine.
Heat
engine can be divided into two main categories.
1.
External Combustion Engine
2.
Internal Combustion Engine
External
Combustion Engine:
In this type of engine the combustion of fuel takes place
outside the cylinder. These types of engines are used to
locomotives, ships etc. In locomotive steam is produced by
the combustion of fuel and this steam is used to move a
piston in a cylinder.
It can be
further divided into the following types.
I.
Reciprocating type
a)
Reciprocating steam engine
i.
Simple
ii.
Compound
iii.
Uniflow
II.
Rotary
type
a)
Steam
Turbines
i.
Radial
flow
ii.
Axial flow
Internal
Combustion Engine:
In
this type of engine the combustion of fuel takes place
inside the cylinder. Examples of these types of engines are
gas engines, petrol engines and diesel engines. In these
engines the mixtures of gases and air or fuel and air enters
the cylinder.
It can be
further divided into the following types.
I.
Reciprocating Engine
a)
Spark
Ignition (Petrol and Gas Engine)
i.
2 stroke
ii.
4 stroke
b)
Compressed
Ignition (Diesel Engine)
i.
2 stroke
ii.
4 stroke
II.
Rotary
Engine
a)
Gas
Turbines
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