Engineering Thermodynamics
The specific heat at constant volume is

The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
Any one of the above
The amount of heat required to raise the temperature of 1 kg of water through one degree

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

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