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- Question
A chemical reaction will occur spontaneously at constant pressure and temperature, if the free energy is
Options- A. zero
- B. positive
- C. negative
- D. none of these
- Correct Answer
- negative
- 1. The theoretical minimum work required to separate one mole of a liquid mixture at 1 atm, containing 50 mole % each of n- heptane and n- octane into pure compounds each at 1 atm is
Options- A. -2 RT ln 0.5
- B. -RT ln 0.5
- C. 0.5 RT
- D. 2 RT Discuss
- 2. Linde gas liquefaction process employs cooling
Options- A. by throttling
- B. by expansion in an engine
- C. at constant pressure
- D. none of these Discuss
- 3. In a working refrigerator, the value of COP is always
Options- A. 0
- B. < 0
- C. < 1
- D. > 1 Discuss
- 4. The chemical potential of a component (?i) of a phase is the amount by which its capacity for doing all work, barring work of expansion is increased per unit amount of sustance added for an infinitesimal addition at constant temperature and pressure. It is given by
Options- A.
- B.
- C.
- D. all (a), (b) and (c) Discuss
- 5. Solubility of a substance which dissolves with an increase in volume and liberation of heat will be favoured by the
Options- A. low pressure and high temperature.
- B. low pressure and low temperature.
- C. high pressure and low temperature.
- D. high pressure and high temperature. Discuss
- 6. Degress of freedom at triple point will be
Options- A. 0
- B. 1
- C. 2
- D. 3 Discuss
- 7. Joule-Thomson experiment is
Options- A. isobaric
- B. adiabatic
- C. isenthalpic
- D. both(b) & (c) Discuss
- 8. A refrigerator may be termed as a
Options- A. heat pump
- B. heat engine
- C. Carnot engine
- D. none of these Discuss
- 9. "Law of corresponding states" says that
Options- A. , two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same.
- B. the surface of separation (i. e. the meniscus) between liquid and vapour phase disappears at the critical temperature.
- C. no gas can be liquified above the critical temperature, howsoever high the pressure may be.
- D. the molar heat of energy of gas at constant volume should be nearly constant (about 3 calories). Discuss
- 10. Pick out the correct statement.
Options- A. Compression ratio of an Otto engine is comparatively higher than a diesel engine.
- B. Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio.
- C. Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat.
- D. Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work. Discuss
Chemical Engineering Thermodynamics problems
Search Results
Correct Answer: -RT ln 0.5
Correct Answer: by throttling
Correct Answer: > 1
Correct Answer: all (a), (b) and (c)
Correct Answer: low pressure and low temperature.
Correct Answer: 0
Correct Answer: both(b) & (c)
Correct Answer: heat pump
Correct Answer: , two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same.
Correct Answer: Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio.
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