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INTRODUCTION: Engine: An engine is a device which transforms one form of energy in to another form. Normally most of the engines convert thermal to mechanical work and are called heat engines. Heat Engines:     It is a device which transforms chemical energy of a fuel into is   Thermal energy and utilizes this to perform useful work. Thus, this Thermal energy converted to mechanical energy and are called heat engines.                             Heat engines are classified in to two types:

1.                                                                                                                                                                                   IC engines2.                                                                                                                                                                                        EC engines.