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
- (C) Adiabatic
- (D) Constant pressure