Engineering Thermodynamics
The universal gas constant (or molar constant) of a gas is the product of

Molecular mass of the gas and the specific heat at constant pressure
Molecular mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant volume
Atomic mass of the gas and the gas constant

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Engineering Thermodynamics
The condition for the reversibility of a cycle is

The pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process
All the processes, taking place in the cycle of operation, must be extremely slow
The working parts of the engine must be friction free
All of these

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Engineering Thermodynamics
The thermodynamic difference between a Rankine cycle working with saturated steam and the Carnot cycle is that

Rankine cycle is hypothetical
A Rankine cycle receives heat at two places
Carnot cycle can't work with saturated steam
Heat is supplied to water at temperature below the maximum temperature of the cycle

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