GATE 2023 Mechanical Engineering Q41

Question

Which one of the following statements is FALSE?

Answer

For an ideal gas, the enthalpy is independent of pressure.

Answer

For a real gas going through an adiabatic reversible process, the process equation is given by $PV^\gamma$ = constant, where P is the pressure, V is the volume and $\gamma$ is the ratio of the specific heats of the gas at constant pressure and constant volume.

Answer

For an ideal gas undergoing a reversible polytropic process $PV^{1.5}$ = constant, the equation connecting the pressure, volume and temperature of the gas at any point along the process is $\frac{P}{R} = \frac{mT}{V}$, where R is the gas constant and m is the mass of the gas.

Answer

Any real gas behaves as an ideal gas at sufficiently low pressure or sufficiently high temperature.