An inventor claims to have devised a closed cyclic engine which exchanges heat with cold and hot reservoirs at 25 and 350 ◦c, respectively, and produces 0.45 kj of work for every kj of heat extracted from the hot reservoir. is this claim believable?

Explanation:

The given data is as follows.

,  

Work produced per kJ of heat extracted from hot reservoir = 0.45 kJ = Efficiency

If the device is Carnot cycle then its efficiency will be maximum and its value will be equal to

Using this relation we will calculate the efficiency as follows.

                 Efficiency =

                        =

                       = 0.928

Hence, it means that this type of device is possible and the claim is also believable.

the answer to your question is c.

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