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Q5. State whether the following are true or false with brief justifications: (i) The maximum thermal efficiency...

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Mechanical Engineering

Q5. State whether the following are true orfalse with brief justifications:

(i) The maximum thermal efficiency for any power cycle operatingbetween two thermal reservoirs at temperaturesT1 andT2(T1 >T2) is 1-T2/T1.
(ii) Transferring heat from a cold object to a hot object isforbidden according to the Clausius statement of the secondlaw.

(iii) A cycle that does not violate the Kelvin-Planck statementcannot violate the Clausius statement of the second law.
(iv) For a reversible power cycle, if we hold the temperature ofthe cold reservoir (TC) constant,we can increase the thermal efficiency ? to anyvalue smaller than 1 (100%) by varyingTH.

(v) A system interacting with air at different heights in theatmosphere is interacting with only one thermal reservoir, i.e.,the atmosphere.

Answer & Explanation Solved by verified expert
4.3 Ratings (750 Votes)
i The maximum thermal efficiency for any power cycle operating between two thermal reservoirs at temperatures T1 and T2 T1 T2 is 1 T2T1 yes Carnots theorem states All heat engines between two heat reservoirs are less efficient than a Carnot heat engine operating between the same reservoirs Every Carnot heat engine between a pair of heat reservoirs is    See Answer
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