Chemical Engineering Thermodynamics MCQ Questions & Answers | Chemical Engineering

Freon is commonly is used as a refrigerant in vapour compression refrigeration system.

.For an ideal gas $$PV=nRT$$
So, at constant pressure volume is directly proportional to temperature so to double the volume the temperature also has to be doubled, so the temperature has to be $${327^ \circ }C.$$

All the given statements are correct a closed system is that kind of system which exchanges energy but not matter and an open system is that which exchanges both matter and energy.

Actually the internal energy ($$U$$) of a substance is a function of
$$\eqalign{ & dU = CvdT - \left[ {P + T\left( {\frac{{\left( {\frac{{\partial V}}{{\partial T}}} \right)p}}{{\left( {\frac{{\partial V}}{{\partial P}}} \right)T}}} \right)dV} \right] \cr & {\text{For an ideal gas, }}PV = RT \cr & {\text{So, }}\left( {\frac{{\partial V}}{{\partial T}}} \right)p = \frac{R}{P}\,\,{\text{and }}\left( {\frac{{\partial V}}{{\partial P}}} \right)T = - \frac{{RT}}{{{P^2}}} \cr & {\text{Hence, }}dU = CvdT \cr} $$
Similarly we can prove $$dH = {C_p}dT$$
So, enthalpy and internal energy are solely functions of temperature in case of ideal gas hence $$\Delta E = \Delta H = 0$$

Since the process is time dependent that is the amount of gas in the cylinder decreases with time and hence it is an unsteady state process.

Charles law states that for an ideal gas volume is directly proportional to temperature.

Boyle's law states that for an ideal gas then pressure is inversely proportional to volume when the temperature and the mass of the gas remain constant.

Since volume depends upon the amount of substance it is an extensive property.

Heat and work are both path functions since to bring a particular change in the system the amount of heat and work required will be different in different paths, but by first law of thermodynamics we can say the difference between them is a point function.