40 TOP Chemical Engineering Thermodynamics Online Test – Multiple Choice Questions and Answers 1. When liquid and vapour phases of one component system are in equilibrium (at a given temperature and pressure), the molar free energy is more in liquid phase same in both the phases replaced by chemical potential which is more in vapour phase more in vapour phase 2. Enthalpy changes over a constant pressure path are always zero for __________ gas a perfect an easily liquefiable a real any 3. First law of thermodynamics deals with the irreversible processes only reversible processes only direction of energy transfer none of these 4. For organic compounds, group contribution method can be used for the estimation of critical properties thermal conductivity specific gravity specific volume 5. A solid is transformed into vapour without going to the liquid phase at below triple point always boiling point triple point 6. The work done in isothermal compression compared to that in adiabatic compression will be more more or less depending upon the extent of work done same less 7. A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount”. This is the distribution law a corollary of Henry’s law followed from Margule’s equation none of these 8. For spontaneous changes in an isolated system (S = entropy) ds = 0 ds > 0 ds < 0 ds = Constant 9. One mole of nitrogen at 8 bar and 600 K is contained in a piston-cylinder arrangement. It is brought to 1 bar isothermally against a resisting pressure of 1 bar. The work done (in Joules) by the gas is 10373 4364.9 4988.4 30554 10. Which one is true for a throttling process ? The inversion temperature is different for different gases The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity The inversion temperature is same for all gases A gas may have more than one inversion temperatures Loading … Question 1 of 10
