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    				| 1. | what is heat engine?Explain construction, working and uses. | 
| Answer» A heat engine typically uses energy provided in the form ofheatto doworkand then exhausts the heat which cannot be used to do work. Thefirst lawandsecond law of thermodynamicsconstrain the operation of a heat engine. The first law is the application of conservation of energy to the system, and the second sets limits on the possible efficiency of the machine and determines the direction of energy flow. | |