Basics of Chemical Engineering Thermodynamics Objective Questions - Set 09 - ObjectiveBooks

# Practice Test: Question Set - 09

1. Absolute zero temperature signifies the
(A) Minimum temperature attainable
(B) Temperature of the heat reservoir to which a Carnot engine rejects all the heat that is taken in
(C) Temperature of the heat reservoir to which a Carnot engine rejects no heat
(D) None of these

2. Compressibility factor of a gas is
(A) Not a function of its pressure
(B) Not a function of its nature
(C) Not a function of its temperature
(D) Unity, if it follows PV = nRT

3. A gas performs the maximum work, when it expands
(A) Non-uniformly
(C) Isobarically
(D) Isothermally

4. Efficiency of a heat engine working on Carnot cycle between two temperature levels depends upon the
(A) Two temperatures only
(B) Pressure of working fluid
(C) Mass of the working fluid
(D) Mass and pressure both of the working fluid

5. Pick out the wrong statement.
(A) The chemical potential of a pure substance depends upon the temperature and pressure
(B) The chemical potential of a component in a system is directly proportional to the escaping tendency of that component
(C) The chemical potential of ith species (μi) in an ideal gas mixture approaches zero as the pressure or mole fraction (xi) tends to be zero at constant temperature
(D) The chemical potential of species 'i' in the mixture (μi) is mathematically represented as,µi = ∂(nG)/∂ni]T,P,nj where, nni and nj respectively denote the total number of moles, moles of ith species and all mole numbers except ith species. 'G' is Gibbs molar free energy

6. For a thermodynamic system containing 'x' chemical species, the maximum number of phases that can co-exist at equilibrium is
(A) x
(B) x + 1
(C) x + 2
(D) x + 3

7. Gibbs free energy of mixing at constant pressure and temperature is always
(A) 0
(B)
(C) + ve
(D) - ve

8. At __________ point, all the three phases (i.e. solid, liquid and gas) co-exist.
(A) Eutectic
(B) Triple
(C) Plait
(D) Critical

9. For an incompressible fluid, the __________ is a function of both pressure as well as temperature.
(A) Internal energy
(B) Enthalpy
(C) Entropy
(D) All (a), (b) & (c)

10. Specific __________ does not change during a phase change (e.g. sublimation, melting, vaporization etc.).
(A) Entropy
(B) Internal energy
(C) Enthalpy
(D) Gibbs free energy

11. When dilute aqueous solutions of two salts are mixed, the process is associated with
(A) Decrease in temperature
(B) Increase in temperature
(C) No change in temperature
(D) Change in temperature which is a function of composition

12. Which of the following is Virial equation of state?
(A) (p + a/V2)(V - b) = nRT
(B) PV = nRT
(C) PV = A + B/V + C/V2 + D/V3 + ...
(D) None of these

13. For a cyclic process, a fixed ratio between heat and work
(A) Always exists
(B) May exist
(C) Never exists
(D) Is difficult to predict

14. Joule-Thomson effect i.e., a throttling process is a constant __________ process.
(A) Entropy
(B) Temperature
(C) Internal energy
(D) Enthalpy

15. Equilibrium constant of a reaction varies with the
(A) Initial concentration of the reactant
(B) Pressure
(C) Temperature
(D) None of these

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