Engineering Thermodynamics
The heat absorbed or rejected by the working substance is given by (where ds = Increase or decrease of entropy, T = Absolute temperature, and dQ = Heat absorbed or rejected)

δQ = T.ds
δQ = T/ds
dQ = ds/T
None of the listed here

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Engineering Thermodynamics
Which of the following is the correct statement of the second law of thermodynamics?

There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
All of these
It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source

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