An engine is a ____ designed to convert one form of energy into ____ energy. Heat engines burn ____ to create heat, which is then used to do work. It is a complex machine built to convert heat from burning ____ into the force that turns the ____. The chain of reactions that achieve that objective is set in motion by a ____, which ignites a mixture of petrol, vapor, and compressed air inside a momentarily sealed cylinder and causes it to burn rapidly. The engine has two types, one is the ____ combustion engine and another one is the external ____ engine. The internal combustion engine is those heat engines that burn their fuel inside the engine ____. External combustion engines are those heat engines that burn their fuel outside the cylinder. The main parts of an car engine are cylinder ____, cylinder head, oil ____, manifolds, gasket, and piston, a piston ____, piston pin, connecting ____, crankshaft, camshaft, flywheels, rod ____, main bearings, and bearing caps.

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