Computer Based Test Chemical Engineering Thermodynamics - Set 04 - ObjectiveBooks
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# Practice Test: Question Set - 04

1. When a gas is subjected to adiabatic expansion, it gets cooled due to
(A) Decrease in velocity
(B) Decrease in temperature
(C) Decrease in kinetic energy
(D) Energy spent in doing work

2. Choose the condition that must be specified in order to liquify CO2 (triple point for CO2 is - 57°C and 5.2 atm).
(A) Pressure must be kept below 5.2 atm
(B) Temperature must be kept above - 57°C
(C) Pressure must be kept below 5.2 atm. and temperature must be kept above 57°C
(D) Pressure and temperature must be kept below 5.2 atm. and - 57°C respectively

3. Work done in case of free expansion is
(A) Indeterminate
(B) Zero
(C) Negative
(D) None of these

4. The change in __________ is equal to the reversible work for compression in steady state flow process under isothermal condition.
(A) Internal energy
(B) Enthalpy
(C) Gibbs free energy
(D) Helmholtz free energy

5. Ideal gas law is applicable at
(A) Low T, low P
(B) High T, high P
(C) Low T, high P
(D) High T, low P

6. Gibbs free energy (F) is defined as
(A) F = E - TS
(B) F = H - TS
(C) F = H + TS
(D) F = E + TS

7. For an isothermal process, the internal energy of a gas
(A) Increases
(B) Decreases
(C) Remains unchanged
(D) Data insufficient, can't be predicted

8. A refrigeration cycle is the same as a __________ cycle,
(A) Turbine
(B) Heat engine
(C) Reversed heat engine
(D) None of these

9. The molar excess Gibbs free energy, gE, for a binary liquid mixture at T and P is given by, (gE/RT) = A . x1x2, where A is a constant. The corresponding equation for ln y1, where y1 is the activity co-efficient of component 1, is
(A) A . x22
(B) Ax1
(C) Ax2
(D) Ax12

10. The partial molar enthalpy of a component in an ideal binary gas mixture of composition Z, at a temperature T and pressure P, is a function only of
(A) T
(B) T and P
(C) T, P and Z
(D) T and Z

11. The standard Gibbs free energy change of a reaction depends on the equilibrium
(A) Pressure
(B) Temperature
(C) Composition
(D) All (a), (b) and (c)

12. A solute distributes itself between two non-miscible solvents in contact with each other in such a way that, at a constant temperature, the ratio of its concentrations in two layers is constant, irrespective of its total amount". This is
(A) The distribution law
(B) Followed from Margules equation
(C) A corollary of Henry's law
(D) None of these

13. The most important application of distribution law is in
(A) Evaporation
(B) Liquid extraction
(C) Drying
(D) Distillation

14. Pick out the wrong statement
(A) Phase rule variables are intensive properties
(B) Heat and work are both state function
(C) The work done by expansion of a gas in vacuum is zero
(D) CP and CV are state function

15. Enthalpy changes over a constant pressure path are always zero for __________ gas.
(A) Any
(B) A perfect
(C) An easily liquefiable
(D) A real

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