Chemical Engineering Thermodynamics Numerical MCQ Test - Set 29 - ObjectiveBooks

Practice Test: Question Set - 29

1. For a constant pressure reversible process, the enthalpy change (ΔH) of the system is
(A) Cv.dT
(B) Cp.dT
(C) ∫ Cp.dT
(D) ∫ Cv.dT

2. Heat is added at constant pressure in an ideal __________ cycle.
(A) Stirling
(B) Brayton
(C) Rankine
(D) Both (b) and (c)

3. Work done is a
(A) Property of the system
(B) Path function
(C) Point function
(D) State description of a system

4. For the reversible exothermic reaction, N2 + 3H2  2NH3, increase of pressure would
(A) Shift the equilibrium towards right
(B) Give higher yield of NH3
(C) Both (b) and (c)
(D) Neither (a) nor (b)

5. Co-efficient of performance for a reversed Carnot cycle working between temperatures T1 and T2 (T1 > T2) is
(A) T2/(T1 - T2)
(B) T1/(T1 - T2)
(C) (T1 - T2)/T1
(D) (T1 - T2)/T2

6. The free energy change for a chemical reaction is given by (where, K = equilibrium constant)
(A) RT ln K
(B) -RT ln K
(C) -R ln K
(D) T ln K

7. After throttling, gas temperature
(A) Decreases
(B) Increases
(C) Remain same
(D) May increase or decrease; depends on the nature of the gas

8. For a real gas, the chemical potential is given by
(A) RT d ln P
(B) RT d ln f
(C) R d ln f
(D) None of these

9. If the molar heat capacities (Cp or Cv) of the reactants and products of a chemical reaction are identical, then, with the increase in temperature, the heat of reaction will
(A) Increase
(B) Decrease
(C) Remain unaltered
(D) Increase or decrease; depends on the particular reaction

10. Minimum number of phases that exists in a system is 1. Number of chemical species in a colloidal system is
(A) 1
(B) 2
(C) 3
(D) 4

11. The thermodynamic law, PVy = constant, is not applicable in case of
(A) Ideal compression of air
(B) Free expansion of an ideal gas
(C) Adiabatic expansion of steam in a turbine
(D) Adiabatic compression of a perfect gas

12. The expression for entropy change, ΔS = n Cp . ln (T2/T1), is valid for the __________ of a substance.
(A) Simultaneous pressure & temperature change
(B) Heating
(C) Cooling
(D) Both (b) and (c)

13. For an ideal gas, the chemical potential is given by
(A) RT d ln P
(B) R d ln P
(C) R d ln f
(D) None of these

14. Which of the following diagrams does not represent an Otto cycle?

15. Internal energy is equal to the heat absorbed in case of a/an __________ process.
(A) Constant volume
(B) Polytropic