Chemical Engineering Thermodynamics MCQ - Set 35 - ObjectiveBooks

# Practice Test: Question Set - 35

1. When a gas in a vessel expands, its internal energy decreases. The process involved is
(A) Reversible
(B) Irreversible
(C) Isothermal

2. In a P-V diagram (for an ideal gas), an isothermal curve will coincide within adiabatic curve (through a point), when
(A) Cp < Cv
(B) Cp = Cv
(C) Cp > Cv
(D) C ≥ Cv

3. The Joule-Thomson co-efficient is defined as (∂T/∂P)H. Its value at the inversion point is
(A)
(B) 1
(C) 0
(D) -ve

4. The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) Decreases linearly

5. Enthalpy 'H' is defined as
(A) H = E - PV
(B) H = F - TS
(C) H - E = PV
(D) None of these

6. Which of the following is not an equation of state?
(A) Bertholet equation
(B) Clausius-Clapeyron equation
(C) Beattie-Bridgeman equation
(D) None of these

7. A closed system is cooled reversibly from 100°C to 50°C. If no work is done on the system
(A) Its internal energy (U) decreases and its entropy (S) increases
(B) U and S both decreases
(C) U decreases but S is constant
(D) U is constant but S decreases

8. What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?
(A) 2
(B) 0
(C) 3
(D) 1

9. The chemical potential for a pure substance is __________ its partial molal free energy.
(A) More than
(B) Less than
(C) Equal to
(D) Not related to

10. A system is said to be isopiestic, if there is no __________ change.
(A) Temperature
(B) Pressure
(C) Volume
(D) None of these

11. The number of degrees of freedom at the triple point of water is
(A) 0
(B) 1
(C) 2
(D) 3

12. Maxwell's relation corresponding to the identity, dH = dS = Vdp + ∑μi dni is
(A) (∂T/∂V)S, ni = -(∂P/∂S)V, ni
(B) (∂S/∂P)T, ni = (∂V/∂T)P, ni
(C) (∂S/∂V)T, ni = (∂P/∂T)V, ni
(D) (∂T/∂P)S, ni = (∂V/∂S)P, ni

13. In a turbine, the fluid expands almost
(A) Isothermally
(B) Isobarically
(D) None of these

14. Critical solution temperature (or the con-solute temperature) for partially miscible liquids (e.g., phenol-water) is the minimum temperature at which
(A) A homogeneous solution (say of phenol water) is formed
(B) Mutual solubility of the two liquids shows a decreasing trend
(C) Two liquids are completely separated into two layers
(D) None of these

15. Compressibility factor (i.e., the ratio of actual volume of gas to the volume predicted by ideal gas law) for all gases are
(A) Always greater than one
(B) Same at the same reduced temperature
(C) Same at the same reduced pressure
(D) Both (b) & (c)

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