HEAT ENGINE
Heat engine - Heat engine is the machine which converts heat energy into mechanical energy. Heat engine are of two types.
a. External combustion engine - In External combustion engine fuel is burnt or ignited outside the engine cylinder. So it is called as external combustion engine e.g. Steam engine.
b. Internal combustion engine - In internal combustion engine fuel is burnt or ignited inside the engine cylinder so it is called internal combustion engine e.g. Petrol engine, diesel engine.
They are of two types
a. Spark ignition engine - In this type of engine fuel is injected along with air in the cylinder and after compression this mixture is given electric spark due to which fuel starts burning and produces power. e.g. Petrol engine
