Chemical Engineering Thermodynamics Multiple Choice Questions - Set 11 - ObjectiveBooks
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# Practice Test: Question Set - 11

1. If the internal energy of an ideal gas decreases by the same amount as the work done by the system, then the
(A) Process must be isobaric
(B) Temperature must decrease
(D) Both (b) and (c)

2. Sublimation temperature of dry ice (solid CO2) is __________ °C.
(A) -273
(B) 0
(C) -78
(D) 5

3. As pressure approaches zero, the ratio of fugacity to pressure (f/P) for a gas approaches
(A) Zero
(B) Unity
(C) Infinity
(D) An indeterminate value

4. A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is
(A) Zero
(B) Positive
(C) Negative
(D) None of these

5. A two stage compressor is used to compress an ideal gas. The gas is cooled to the initial temperature after each stage. The intermediate pressure for the minimum total work requirement should be equal to the __________ mean of P1 and P2.(where, P1 and P2 are initial and final pressures respectively)
(A) Logarithmic
(B) Arithmetic
(C) Geometric
(D) Harmonic

6. During a reversible isothermal expansion of an ideal gas, the entropy change is
(A) +ve
(B) 0
(C) -ve
(D) ∞

7. Mollier chart is a __________ plot.
(A) Pressure vs. enthalpy
(B) Pressure vs. volume
(C) Enthalpy vs. entropy
(D) Temperature vs. entropy

8. The equation, (d loge PA/d loge xA) = (d loge PA/d loge xB) applicable to a binary solution of components. A and B in equilibrium with their vapors at constant temperature and pressure is called the __________ equation.
(A) Van Laar
(B) Margules
(C) Gibbs-Duhem
(D) Gibbs-Duhem-Margules

9. For a stable phase at constant pressure and temperature, the fugacity of each component in a binary system __________ as its mole fraction increases.
(A) Decreases
(B)
(C) Remain same
(D) Decreases linearly

10. Consider the process A & B shown in the figure given below: In this case, it is possible that

(A) Both the processes are adiabatic
(B) Both the processes are isothermal
(C) Process A is isothermal while B is adiabatic
(D) Process A is adiabatic while B is isothermal

11. A domestic refrigerator has a/an __________ cooled condenser.
(A) Water
(B) Air
(C) Evaporative
(D) Gas

12. Rotary lime kiln is an example of a/an __________ system.
(A) Closed
(B) Open
(C) Isolated
(D) Non-thermodynamic

13. The equilibrium constant for a chemical reaction at two different temperatures is given by
(A) Kp2/Kp1 = - (∆H/R) (1/T2 - 1/T1)
(B) Kp2/Kp1 = (∆H/R) (1/T2 - 1/T1)
(C) Kp2/Kp1 = ∆H (1/T2 - 1/T1)
(D) Kp2/Kp1 = - (1/R) (1/T2 - 1/T1)

14. Isobaric process means a constant process.
(A) Temperature
(B) Pressure
(C) Volume
(D) Entropy

15. Pick out the wrong statement.
(A) System (of partially miscible liquid pairs), in which the mutual solubility increases with rise in temperature, are said to possess an upper consolute temperature
(B) Systems, in which the mutual solubility increases with decrease in temperature, are said to possess lower consolute temperature
(C) Nicotine-water system shows both an upper as well as a lower consolute temperature, implying that they are partially miscible between these two limiting temperatures
(D) None of these

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