Mechanical Engineering :: Thermodynamics
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The general gas energy equation is (where Q1 - 2 = Heat supplied, dU = Change in internal energy, and W1 - 2 = Work done in heat units)
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In an isothermal process,
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Which of the following is the correct statement of the second law of thermodynamics?It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work.
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A.
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work. |
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B.
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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C.
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy. |
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D.
all of the above |