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Question
How does heat engine convert thermal and chemical energy to mechanical energy?
Options:
A .  With the help of steam
B .  By converting the input energy into electrical energy which is then used to drive mechanical systems
C .  By bringing a working substance from a higher state temperature to a lower state temperature
D .  By converting the input electrical energy to mechanical energy
Answer: Option C
Answer: (c).By bringing a working substance from a higher state temperature to a lower state temperature

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