Engineering Thermodynamics
A closed system is one in which

Both energy and mass cross the boundaries of the system
Neither mass nor energy crosses the boundaries of the system
Mass does not cross boundaries of the system, though energy may do so
Mass crosses the boundary but not the energy

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Engineering Thermodynamics
According to Avogadro’s law

Equal volumes of all gases, at the same temperature and pressure, contain equal number of molecules
The sum of partial pressure of the mixture of two gases is sum of the two
The product of the gas constant and the molecular mass of an ideal gas is constant
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

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

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