Chemical Engineering Thermodynamics pdf MCQ Practice - Set 14 - ObjectiveBooks

Chemical Engineering Thermodynamics pdf MCQ Practice - Set 14

Practice Test: Question Set - 14

1. Which of the following is not affected by temperature changes?
    (A) Fugacity
    (B) Activity co-efficient
    (C) Free energy
    (D) None of these

2. For multi-component multiple phases to be in equilibrium at the same pressure and temperature, the __________ of each component must be same in all phases.
    (A) Chemical potential
    (B) Fugacity
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

3. Helmholtz free energy (A) is defined as
    (A) A = H - TS
    (B) A = E - TS
    (C) A = H + TS
    (D) None of these

4. For a spontaneous process, free energy
    (A) Is zero
    (B) Increases
    (C) Decreases whereas the entropy increases
    (D) And entropy both decrease

5. The Carnot co-efficient of performance (COP) of a domestic air conditioner compared to a household refrigerator is
    (A) Less
    (B) More
    (C) Same
    (D) Dependent on climatic conditions

6. In an ideal refrigeration cycle, the change in internal energy of the fluid is
    (A) +ve
    (B) -ve
    (C) 0
    (D) Either of the above three; depends on the nature of refrigerant

7. Melting of ice is an example of an __________ process.
    (A) Adiabatic
    (B) Isothermal
    (C) Isometric
    (D) None of these

8. Which of the following equations is used for the prediction of activity co-efficient from experiments?
    (A) Van Laar equation
    (B) Margules equation
    (C) Wilson's equation
    (D) All (a), (b) and (c)

9. Measurement of thermodynamic property of temperature is facilitated by __________ law of thermodynamics.
    (A) 1st
    (B) Zeroth
    (C) 3rd
    (D) None of these

10. A system undergoes a change from a given initial state to a given final state either by an irreversible process or by a reversible process, then (where, Δ S1 and Δ SR are the entropy changes of the system for the irreversible and reversible processes respectively)
    (A) Δ S1 is always < Δ SR
    (B) Δ S1 is sometimes > Δ SR
    (C) Δ S1 is always > Δ SR
    (D) Δ S1 is always = Δ SR

11. Refrigeration cycle
    (A) Violates second law of thermodynamics
    (B) Involves transfer of heat from low temperature to high temperature
    (C) Both (a) and (b)
    (D) Neither (a) nor (b)

12. On a P-V diagram of an ideal gas, suppose a reversible adiabatic line intersects a reversible isothermal line at point A. Then at a point A, the slope of the reversible adiabatic line (∂P/∂V)s and the slope of the reversible isothermal line (∂P/∂V)T are related as (where, y = Cp/Cv)
    (A) (∂P/∂V)S = (∂P/∂V)T
    (B) (∂P/∂V)S = [(∂P/∂V)T]Y
    (C) (∂P/∂V)S = y(∂P/∂V)T
    (D) (∂P/∂V)S = 1/y(∂P/∂V)T

13. In the reaction, C + O2 → CO2; ΔH = - 94 kcal. What is the heat content (enthalpy) of O2?
    (A) -94 kcal
    (B) > -94 kcal
    (C) < - 94 kcal
    (D) Zero

14. "At the absolute zero temperature, the entropy of every perfectly crystalline substance becomes zero". This follows from the
    (A) Third law of thermodynamics
    (B) Second law of thermodynamics
    (C) Nernst heat theorem
    (D) Maxwell's relations

15. The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process.
    (A) Isobaric
    (B) Isothermal
    (C) Adiabatic
    (D) None of these

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