Introduction to Chemical Engineering Thermodynamics Online Test - Set 12 - ObjectiveBooks
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# Practice Test: Question Set - 12

1. Fugacity is a measure of the
(A) Escaping tendencies of the same substance in different phases of a system
(B) Relative volatility of a mixture of two miscible liquids
(C) Behavior of ideal gases
(D) None of these

2. Pick out the wrong statement.
(A) The net change in entropy in any reversible cycle is always zero
(B) The entropy of the system as a whole in an irreversible process increases
(C) The entropy of the universe tends to a maximum
(D) The entropy of a substance does not remain constant during a reversible adiabatic change

3. A system is said to be at equilibrium, if the entropy of the system has reached __________ value.
(A) Minimum
(B) Zero
(C) Maximum
(D) None of these

4. During Joule-Thomson expansion of gases
(A) Enthalpy remains constant
(B) Entropy remains constant
(C) Temperature remains constant
(D) None of these

5. The kinetic energy of gas molecule is zero at
(A) 0°C
(B) 273°C
(C) 100°C
(D) -273°C

6. The value of Joule-Thomson co-efficient, in case where cooling occurs after the throttling process is
(A) 0
(B) ∞
(C) +ve
(D) -ve

7. In the equation PVn = constant, if the value of n = y = Cp/Cv, then it represents a reversible __________ process.
(A) Isothermal
(C) Isentropic
(D) Polytropic

8. Joule-Thomson co-efficient is defined as
(A) µ = (∂P/∂T)H
(B) µ = (∂T/∂P)H
(C) µ = (∂E/∂T)H
(D) µ = (∂E/∂P)H

9. Linde gas liquefaction process employs cooling
(A) By throttling
(B) By expansion in an engine
(C) At constant pressure
(D) None of these

10. Gibbs free energy per mole for a pure substance is equal to the
(A) Latent heat of vaporization
(B) Chemical potential
(C) Molal boiling point
(D) Heat capacity

11. For a given substance at a specified temperature, activity is __________ to fugacity.
(A) Directly proportional
(B) Inversely proportional
(C) Equal
(D) None of these

12. All gases except __________ shows a cooling effect during throttling process at atmospheric temperature and pressure.
(A) Oxygen
(B) Nitrogen
(C) Air
(D) Hydrogen

13. To obtain integrated form of Clausius-Clapeyron equation, ln (P2/P1) = (∆HV/R) (1/T1 - 1/T2) from the exact Clapeyron equation, it is assumed that the
(A) Volume of the liquid phase is negligible compared to that of vapor phase
(B) Vapor phase behaves as an ideal gas
(C) Heat of vaporization is independent of temperature
(D) All (a), (b) & (c)

14. Out of the following refrigeration cycles, which one has maximum COP?
(A) Air cycle
(B) Carnot cycle
(C) Ordinary vapor compression cycle
(D) Vapor compression with a reversible expansion engine

15. Joule-Thomson co-efficient which is defined as, η = (∂T/∂P)H = 1/Cp (∂H/∂T)P, changes sign at a temperature known as inversion temperature. The value of Joule-Thomson co-efficient at inversion temperature is
(A) 0
(B)
(C) +ve
(D) -ve

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