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- Question
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
- Correct Answer
- zero
- 1. 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
- 2. 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
- 3. Entropy of an ideal gas depends upon its
Options- A. pressure
- B. temperature
- C. both (a) & (b)
- D. neither (a) nor (b) Discuss
- 4. 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
- 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
- 6. 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
- 7. 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
- 8. 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
- 9. The co-efficient of performance (COP) of a refrigerating system, which is its index of performance, is defined as the ratio of useful refrigeration to the net work. The units of __________ and COP are the same.
Options- A. kinematic viscosity
- B. work
- C. temperature
- D. none of these Discuss
- 10. In jet refrigerators, the refrigerating fluid is practically always
Options- A. water
- B. ammonia
- C. freon
- D. brine Discuss
Chemical Engineering Thermodynamics problems
Search Results
Correct Answer: 327
Correct Answer: Air cycle
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: viscosity
Correct Answer: H2
Correct Answer: with pressure changes at constant temperature.
Correct Answer: none of these
Correct Answer: water
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