Chemical Engineering Thermodynamics MCQ Questions & Answers | Chemical Engineering

The given number of component $$= 2$$
Given number of phases $$= 2$$
We know, $${\text{degree of freedom (number of independent variables) }} = C - \phi + 2$$
$$\left( {{\text{assuming no reaction taking place}}} \right)$$
$$f = 2 - 2 + 2 = 2$$
And since under azeotropic conditions the composition of a component in both the phases remains same one of the independent variable becomes dependent and hence the degree of freedom reduces to 1.

The given number of component $$= 2$$
Given number of phases $$= 2$$
We know, $${\text{degree of freedom (number of independent variables) }} = C - \phi + 2$$
$$\left( {{\text{assuming no reaction taking place}}} \right)$$
$$f = 2 - 2 + 2 = 2$$
And since under azeotropic conditions the composition of a component in both the phases remains same one of the independent variable becomes dependent and hence the degree of freedom reduces to 1.

At the triple point all the three physical phases coexist in equilibrium. And at this point the degree of freedom is zero.

Since at reduced conditions all the substances behaves more or less same we can say that the critical compressibility of two substances is also more or less same.

Definition: one ton of refrigeration is defined as the heat rate corresponding to melting of one ton of ice in one day.

Since a perfect gas can also be considered as an ideal gas and for ideal gas hence at constant pressure the temperature remains constant and for ideal gas since enthalpy is solely a function of temperature we can say enthalpy is zero.

Since Efficiency of a Carnot engine is $$\aleph = 1 - \frac{{{T_2}}}{{{T_1}}}$$
So, when the cold reservoir temperature is zero or when the hot reservoir temperature is infinity we can say that the efficiency is $$100\% .$$
But this is purely an impossible situation even under ideal conditions as given by second law of thermodynamics.

$$f = C - \phi + 2 + {\text{ number of chemical reactions}} + {\text{ number of constraints}}$$
$$ \Rightarrow {\text{ given number of components}} = 3$$
Number of phase $$=2,$$  number of independent chemical reactions $$=1,$$  number of constraints $$= 1$$  (initially only $$A$$ is present)
So, $$f=2$$

We know, $$PV=nRT$$   for an ideal gas so at constant temperature (isothermal process) $$PV=constant.$$

Mollier diagram is a plot between the enthalpy and entropy and it is very useful during phase change calculations.