Chemical Engineering Thermodynamics problems
- 1. Degress of freedom at triple point will be
Options- A. 0
- B. 1
- C. 2
- D. 3 Also asked in: Bank Exams
Correct Answer: 0
- 2. Joule-Thomson experiment is
Options- A. isobaric
- B. adiabatic
- C. isenthalpic
- D. both(b) & (c) Discuss
Correct Answer: both(b) & (c)
- 3. A refrigerator may be termed as a
Options- A. heat pump
- B. heat engine
- C. Carnot engine
- D. none of these Discuss
Correct Answer: heat pump
- 4. "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
Correct Answer: , two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same.
- 5. 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
Correct Answer: Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio.
- 6. In any spontaneous process,
Options- A. only F decreases
- B. only A decreases
- C. both F and A decreases
- D. both F and A increase Discuss
Correct Answer: both F and A decreases
- 7. Entropy of an ideal gas depends upon its
Options- A. pressure
- B. temperature
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
Correct Answer: both (a) & (b)
- 8. Out of the following refrigration cycles, which one has the minimum COP (Co-efficient of performance)?
Options- A. Air cycle
- B. Carnot cycle
- C. Ordinary vapour compression cycle
- D. Vapour compression with a reversible expansion engine Discuss
Correct Answer: Air cycle
- 9. Keeping the pressure constant, to double the volume of a given mass of an ideal gas at 27°C, the temperature should be raised to __________ °C.
Options- A. 270
- B. 327
- C. 300
- D. 540 Discuss
Correct Answer: 327
- 10. Internal energy change of a system over one complete cycle in a cyclic process is
Options- A. zero
- B. +ve
- C. -ve
- D. dependent on the path Discuss
Correct Answer: zero
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