Engineering Thermodynamics
Gases have

Under some conditions one value and sometimes two values of specific heat
Only one value of specific heat
Two values of specific heat
No value of specific heat

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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 transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
All of these
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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