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 . x1. x2, 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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