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Indicate whether each of the following statements about a heat engine is correct. To decrease the...

Indicate whether each of the following statements about a heat engine is correct.
To decrease the efficiency of a heat engine, TH must be maximized or TC must be minimized.
Raising the temperature of the cold region will reduce efficiency.
Raising the temperature of the hot region will reduce efficiency.
Lowering the temperature of the hot region will increase efficiency.
To increase the efficiency of a heat engine, TH must be minimized or TC must be maximized .

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Answer #1

First statement is wrong because maximising TH or minimising TC will increase efficiency.
Second statement is correct because raising the temperature of cold region will reduce efficiency
Third statement is wrong because raising the temperature of hot region will increase efficiency
Fourth statement is wrong because lowering the temperature of the hot region will decrease efficiency.
Fifth statement is wrong because minimising TH or maximising TC will reduce the efficiency of engine
Hence, the only correct statement is the second statement from top.

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