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...Engine working principles a heat is machine which converts energy into mechanical the combustion of fuel such as coal petrol diesel generates this supplied to substance at high temperature by expansion in suitable machines converted useful work engines can be further divided two types i external and ii internal steam takes place outside thus formed used run it known case inside cylinder itself ic classified stationary or mobile horizontal verti cal iii low medium speed distinct for either operations are carburettor reciprocating wankel rotary gas turbine ci si stroke four chart spark ignition type liquid atomised vaporized mixed with air correct proportion before being taken through intake manifolds mixture caused an electric compression only injected under pressure constructional features cross section shown fig brief description these parts given below constitutes basic supporting portion power unit its major function provide space piston operate draw depending upon compress allow ex...