Chemical Engineering Thermodynamics problems
- 1. For a spontaneous process, free energy
Options- A. is zero
- B. increases
- C. decreases whereas the entropy increases
- D. and entropy both decrease Discuss
Correct Answer: decreases whereas the entropy increases
- 2. Pick out the wrong statement pertaining to the decomposition of PCl5 represented by, PCl5 ⇌ PCl3 + Cl2.Degree of dissociation of PCl5 will
Options- A. decrease on addition of Cl2.
- B. increase on addition of an inert gas at constant pressure.
- C. decrease on increasing the pressure of the system.
- D. none of these Discuss
Correct Answer: none of these
- 3. Pick out the correct statement:
Options- A. In an isothermal system, irreversible work is more than reversible work.
- B. Under reversible conditions, the adiabatic work is less than isothermal work.
- C. Heat, work, enthalpy and entropy are all 'state functions'.
- D. Matter and energy can not be exchanged with the surroundings in a closed system. Discuss
Correct Answer: Under reversible conditions, the adiabatic work is less than isothermal work.
- 4. A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?
Options- A. Vapor compression cycle using expansion valve.
- B. Air refrigeration cycle.
- C. Vapor compression cycle using expansion engine.
- D. Carnot refrigeration cycle. Discuss
Correct Answer: Carnot refrigeration cycle.
- 5. The accentric factor of a materical, '?', is defined as ? = -log10(Prsat)Tr-1 = 0.7, where, Prsat = reduced vapor pressure, Tr = reduced temperature. The value of accentric factor is always
Options- A. > 2
- B. < 1
- C. > 1
- D. < 3 Discuss
Correct Answer: < 1
- 6. Entropy is a measure of the __________ of a system.
Options- A. disorder
- B. orderly behaviour
- C. temperature changes only
- D. none of these Discuss
Correct Answer: disorder
- 7. Water on heating from 1 to 4°C
Options- A. contracts
- B. expands
- C. has same volume
- D. may contract or expand Discuss
Correct Answer: contracts
- 8. Fundamental principle of refrigeration is based on the __________ law of thermodynamics.
Options- A. zeroth
- B. first
- C. second
- D. third Discuss
Correct Answer: second
- 9. __________ increases with increase in pressure.
Options- A. The melting point of wax
- B. The boiling point of a liquid
- C. both (a) and (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) and (b)
- 10. The freezing point of a liquid decreases when the pressure is increased, if the liquid __________ while freezing.
Options- A. contracts
- B. expands
- C. does not change in volume
- D. either (a), (b) or (c) Discuss
Correct Answer: contracts
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