Chemical Engineering Thermodynamics Interview Questions - Set 17 - ObjectiveBooks
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# Practice Test: Question Set - 17

1. Critical compressibility factor for all substances
(A) Are more or less constant (vary from 0.2 to 0.3)
(B) Vary as square of the absolute temperature
(C) Vary as square of the absolute pressure
(D) None of these

2. The expression, nRT ln(P1/P2), is for the __________of an ideal gas.
(A) Compressibility
(B) Work done under adiabatic condition
(C) Work done under isothermal condition
(D) Co-efficient of thermal expansion

3. For an ideal liquid solution, which of the following is unity?
(A) Activity
(B) Fugacity
(C) Activity co-efficient
(D) Fugacity co-efficient

4. Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5  PCl3 + Cl2.Degree of dissociation of PCl5 will
(A) Decrease on addition of Cl2
(B) Increase on addition of an inert gas at constant pressure
(C) Decrease on increasing the pressure of the system
(D) None of these

5. The necessary and sufficient condition for equilibrium between two phases is
(A) The concentration of each component should be same in the two phases
(B) The temperature of each phase should be same
(C) The pressure should be same in the two phases
(D) The chemical potential of each component should be same in the two phases

6. As the temperature is lowered towards the absolute zero, the value of the quantity (∂∆F/∂T) approaches
(A) Zero
(B) Unity
(C) Infinity
(D) None of these

7. The relation connecting the fugacities of various components in a solution with one another and to composition at constant temperature and pressure is called the __________ equation.
(A) Gibbs-Duhem
(B) Van Laar
(C) Gibbs-Helmholtz
(D) Margules

8. Thermal efficiency of a Carnot engine can approach 100%, only when the temperature of the
(A) Cold reservoir approaches zero
(B) Hot reservoir approaches infinity
(C) Either (a) or (b)
(D) Neither (a) nor (b)

9. Equilibrium constant decreases as the temperature
(A) Increases, for an exothermic reaction
(B) Decreases, for an exothermic reaction
(C) Increases, for an endothermic reaction
(D) None of these

10. __________ calorimeter is normally used for measuring the dryness fraction of steam, when it is very low.
(A) Bucket
(B) Throttling
(C) Separating
(D) A combination of separating & throttling

11. Pick out the wrong statement.
(A) A refrigeration cycle violates the second law of thermodynamics
(B) Refrigeration cycle is normally represented by a temperature vs. entropy plot
(C) In a refrigerator, work required decreases as the temperature of the refrigerator and the temperature at which heat is rejected increases
(D) One ton of refrigeration is equivalent to the rate of heat absorption equal to 3.53 kW

12. The necessary condition for phase equilibrium in a multiphase system of N components is that the
(A) Chemical potentials of a given component should be equal in all phases
(B) Chemical potentials of all components should be same in a particular phase
(C) Sum of the chemical potentials of any given component in all the phases should be the same
(D) None of these

13. The main feature of Carnot refrigeration cycle is that, it
(A) Does not need the addition of external work for its functioning
(B) Transfers heat from high temperature to low temperature
(C) Accomplishes the reverse effect of the heat engine
(D) None of these

14. The chemical potential of a component (μi) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of substance added for an infinitesimal addition at constant temperature and pressure. It is given by
(A) (∂E/∂ni)S, v, nj
(B) (∂G/∂ni)T, P, nj = (∂A/∂ni) T, v, nj
(C) (∂H/∂ni)S, P, nj
(D) All (a), (b) and (c)

15. In a homogeneous solution, the activity co-efficient of a component depends upon the
(A) Pressure
(B) Composition
(C) Temperature
(D) All (a), (b) and (c)

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