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- Question
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
- Correct Answer
- Air cycle
- 1. Entropy of an ideal gas depends upon its
Options- A. pressure
- B. temperature
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 2. 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
- 3. 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
- 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
- 5. A refrigerator may be termed as a
Options- A. heat pump
- B. heat engine
- C. Carnot engine
- D. none of these Discuss
- 6. 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
- 7. 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
- 8. High __________ is an undesirable property for a good refrigerant.
Options- A. specific heat
- B. latent heat of vaporisation
- C. viscosity
- D. specific vapor volume Discuss
- 9. All gases during throttling process at atmospheric temperature and pressure show a cooling effect except
Options- A. CO2
- B. H2
- C. O2
- D. N2 Discuss
- 10. The expression,
, gives the free energy change
Options- A. with pressure changes at constant temperature.
- B. under reversible isothermal volume change.
- C. during heating of an ideal gas.
- D. during cooling of an ideal gas. Discuss
Chemical Engineering Thermodynamics problems
Search Results
Correct Answer: both (a) & (b)
Correct Answer: both F and A decreases
Correct Answer: Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio.
Correct Answer: , two different gases behave similarly, if their reduced properties (i.e. P, V and T) are same.
Correct Answer: heat pump
Correct Answer: 327
Correct Answer: zero
Correct Answer: viscosity
Correct Answer: H2
Correct Answer: with pressure changes at constant temperature.
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