A) eleminate friction
B) find ideal sources
C) prevent radiation
D) reach absolute zero temperature
Correct Answer: D
Solution :
The efficiency of Carnot engine is \[\eta =\frac{{{T}_{1}}-{{T}_{2}}}{{{T}_{1}}}=1-\frac{{{T}_{2}}}{{{T}_{1}}}\] ?.(1) The value of efficiency of Carnot engine can be 1 or 100%, if the sink temperature (Ty must be 0 K. As practically absolute zero temperature cannot be achieved hence, Cannot engine cannot give 100% efficiency.
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