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

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

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Engineering Thermodynamics
Carnot cycle consists of

Two constant volume and two isentropic processes
Two constant pressure and two isentropic processes
One constant volume, one constant pressure and two isentropic processes
Two isothermal and two isentropic processes

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