Engineering Thermodynamics
The value of the product of molecular weight and the gas characteristic constant for all the gases in S.I. units is

735 J/kmol °K
29.27 J/kmol °K
83.14 J/kmol °K
848 J/kmol °K

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Engineering Thermodynamics
Extensive property of a system is one whose value

Does not depend on the mass of the system, like temperature, pressure, etc.
Is dependent on the path followed and not on the state
Depends on the mass of the system like volume
Is not dependent on the path followed but on the state

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Engineering Thermodynamics
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
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
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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