Chemical Engineering Thermodynamics Equations MCQs - Set 21 - ObjectiveBooks
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Chemical Engineering Thermodynamics Equations MCQs - Set 21

Practice Test: Question Set - 21


1. Internal energy of an element at 1 atm and 25° C is __________ kcal/kg.mole.
    (A) 0
    (B) 273
    (C) 25
    (D) None of these

2. Compressibility factor-reduced pressure plot on reduced co-ordinates facilitates
    (A) Use of only one graph for all gases
    (B) Covering of wide range
    (C) Easier plotting
    (D) More accurate plotting

3. For a constant volume process __________ by the system is used only to increase the internal energy.
    (A) Heat absorbed
    (B) Work done
    (C) Both (a) & (b)
    (D) Neither (a) nor (b)

4. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except
    (A) CO2
    (B) H2
    (C) O2
    (D) N2

5. A change in state involving a decrease in entropy can be spontaneous, only if
    (A) It is exothermic
    (B) It is isenthalpic
    (C) It takes place isothermally
    (D) It takes place at constant volume

6. The ratio of equilibrium constants (Kp2/Kp1) at two different temperatures is given by
    (A) (R/∆H) (1/T1 - 1/T2)
    (B) (∆H/R) (1/T1 - 1/T2)
    (C) (∆H/R) (1/T2 - 1/T1)
    (D) (1/R) (1/T1 - 1/T2)

7. Specific __________ does not change during phase change at constant temperature and pressure.
    (A) Entropy
    (B) Gibbs energy
    (C) Internal energy
    (D) Enthalpy

8. In the decomposition of PCl5 represented by, PCl5  PCl3 + Cl2, decrease in the pressure of the system will __________ the degree of dissociation of PCl5.
    (A) Increase
    (B) Decrease
    (C) Not alter
    (D) None of these

9. High __________ is an undesirable property for a good refrigerant.
    (A) Specific heat
    (B) Latent heat of vaporization
    (C) Viscosity
    (D) Specific vapor volume

10. Pick out the correct equation relating 'F' and 'A'.
    (A) F = A + PV
    (B) F = E + A
    (C) F = A - TS
    (D) F = A + TS

11. Which of the following liquid metals has the highest thermal conductivity?
    (A) Molten sodium
    (B) Molten lead
    (C) Mercury
    (D) Molten potassium

12. A cylinder contains 640 gm of liquid oxygen. The volume occupied (in liters) by the oxygen, when it is released and brought to standard conditions (0°C, 760 mm Hg) will be __________ liters.
    (A) 448
    (B) 224
    (C) 22.4
    (D) Data insufficient; can't be computed

13. If heat contents of CH4, C2H4 and C3H8 are -17.9, 12.5 and -24.8 kcal/mole respectively, than ΔH for the reaction CH4(g) + C2H4(g C3H8(g) will be __________ Kcal.
    (A) -19.4
    (B) -30.2
    (C) 55.2
    (D) -55.2

14. Which of the following is not an intensive property?
    (A) Chemical potential
    (B) Surface tension
    (C) Heat capacity
    (D) None of these

15. y = specific heat ratio of an ideal gas is equal to
    (A) Cp/Cv
    (B) Cp/(CP-R)
    (C) 1 + (R/CV)
    (D) All (a), (b) and (c)

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