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