MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 40 Mcqs, each offering curated multiple-choice questions to sharpen your Chemical Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
For film wise condensation on a vertical plane, the film thickness δ and heat transfer coefficient h vary with distance x from the leading edge as |
| A. | δ decreases, h increases |
| B. | Both δ and h increases |
| C. | δ increases, h decreases |
| D. | Both δ and h decreases |
| Answer» D. Both δ and h decreases | |
| 2. |
In condensation over a vertical surface, the value of convection coefficient varies as |
| A. | k 0.25 |
| B. | k 0.33 |
| C. | k 0.75 |
| D. | k -0.5 |
| Answer» B. k 0.33 | |
| 3. |
Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensation |
| A. | Remains constant at all heights of the surface |
| B. | Decreases with increasing distance from the top of the surface |
| C. | Increases with increasing thickness of film |
| D. | Increases with increasing temperature differential between the surface and vapour |
| Answer» C. Increases with increasing thickness of film | |
| 4. |
Consider the following statements(i) If a condensing liquid does not wet a surface, then drop wise condensation will not take place on it(ii) Drop wise condensation gives a higher transfer rate than film wise condensation(iii) Reynolds number of condensing liquid is based on its mass flow rate(iv) Suitable coating or vapor additive is used to promote film wise condensationIdentify the correct statement |
| A. | i and ii |
| B. | ii, iii and iv |
| C. | iv only |
| D. | i, ii and iii |
| Answer» E. | |
| 5. |
Condensation process is very common in(i) Boilers(ii) Condensers(iii) EvaporatorsIdentify the correct statements |
| A. | i and ii |
| B. | ii and iii |
| C. | i, ii and iii |
| D. | i and iii |
| Answer» D. i and iii | |
| 6. |
Condensation refers to a change from the |
| A. | Solid to a liquid phase |
| B. | Vapor to a liquid phase |
| C. | Liquid to a solid phase |
| D. | Liquid to a vapor phase |
| Answer» C. Liquid to a solid phase | |
| 7. |
A process is carried out for the feed mixture of 40% air and 60% oxygen, the compressor recovered 2% of oxygen, what is the exit pressure of the compressor, if the partial pressure of oxygen vapor is 5 mm Hg? |
| A. | 2.4 mm Hg |
| B. | 4.8 mm Hg |
| C. | 6.5 mm Hg |
| D. | 8.4 mm HgView answer |
| Answer» B. 4.8 mm Hg | |
| 8. |
A process is carried out for the feed mixture of 50% air and 50% methane vapor, the compressor recovered 20% of methane, what is the exit pressure of the compressor, if the partial pressure of methane vapor is 25 mm Hg? |
| A. | 56.3 mm Hg |
| B. | 78.9 mm Hg |
| C. | 92.1 mm Hg |
| D. | 98.7 mm HgView answer |
| Answer» B. 78.9 mm Hg | |
| 9. |
A process is carried out for the feed mixture of 80% air and 20% CO2, the compressor recovered 50% of CO2, what is the exit pressure of the compressor, if the partial pressure of CO2 is 15 mm Hg? |
| A. | 135 mm Hg |
| B. | 145 mm Hg |
| C. | 175 mm Hg |
| D. | 200 mm HgView answer |
| Answer» B. 145 mm Hg | |
| 10. |
What is the fraction of water vapor at 27oC and 1 atm, if the fraction of water vapor at 127oC and 1 atm is 0.8? |
| A. | 0.2 |
| B. | 0.4 |
| C. | 0.6 |
| D. | 0.8View answer |
| Answer» D. 0.8View answer | |
| 11. |
If the fraction of water vapor at 27oC and 5 atm is 0.5, then what is the fraction of water vapor at 27oC and 1 atm? |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.5 |
| D. | 0.8View answer |
| Answer» B. 0.2 | |
| 12. |
Water changes into water vapour only when boiling occurs. The statement is |
| A. | Correct |
| B. | Incorrect |
| C. | Always correct |
| D. | None of the mentioned |
| Answer» C. Always correct | |
| 13. |
Leonard set up the experiment shown below.9. Correct statement is/areA: Steam is formed when water boils.B: water vapour loses heat during condensation. |
| A. | Both A and B |
| B. | Neither A nor B |
| C. | Only A |
| D. | Only B |
| Answer» B. Neither A nor B | |
| 14. |
________ is the change of vapour in a non-condensable gas. |
| A. | Saturation |
| B. | Vaporization |
| C. | Condensation |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 15. |
FOR_FILM_WISE_CONDENSATION_ON_A_VERTICAL_PLANE,_THE_FILM_THICKNESS_‚ÂÀ√≠¬¨‚Ä¢_AND_HEAT_TRANSFER_COEFFICIENT_H_VARY_WITH_DISTANCE_X_FROM_THE_LEADING_EDGE_AS?$# |
| A. | δ decreases, h increases |
| B. | Both δ and h increases |
| C. | δ increases, h decreases |
| D. | Both δ and h decreases |
| Answer» D. Both ‚âà√≠¬¨‚Ä¢ and h decreases | |
| 16. |
WATER_CHANGES_INTO_WATER_VAPOUR_ONLY_WHEN_BOILING_OCCURS._THE_STATEMENT_IS?$ |
| A. | Correct |
| B. | Incorrect |
| C. | Always correct |
| D. | None of the mentioned |
| Answer» C. Always correct | |
| 17. |
A_PROCESS_IS_CARRIED_OUT_FOR_THE_FEED_MIXTURE_OF_40%_AIR_AND_60%_OXYGEN,_THE_COMPRESSOR_RECOVERED_2%_OF_OXYGEN,_WHAT_IS_THE_EXIT_PRESSURE_OF_THE_COMPRESSOR,_IF_THE_PARTIAL_PRESSURE_OF_OXYGEN_VAPOR_IS_5_MM_HG??$ |
| A. | 2.4 mm Hg |
| B. | 4.8 mm Hg |
| C. | 6.5 mm Hg |
| D. | 8.4 mm Hg |
| Answer» B. 4.8 mm Hg | |
| 18. |
IN_CONDENSATION_OVER_A_VERTICAL_SURFACE,_THE_VALUE_OF_CONVECTION_COEFFICIENT_VARIES_AS?$ |
| A. | k <sup>0.25</sup> |
| B. | k<sup> 0.33</sup> |
| C. | k<sup> 0.75</sup> |
| D. | k <sup>-0.5</sup> |
| Answer» B. k<sup> 0.33</sup> | |
| 19. |
Saturated steam is allowed to condense over a vertical flat surface and the condensate film flows down the surface. The local coefficient of heat transfer for condensatio? |
| A. | Remains constant at all heights of the surface |
| B. | Decreases with increasing distance from the top of the surface |
| C. | Increases with increasing thickness of film |
| D. | Increases with increasing temperature differential between the surface and vapour |
| Answer» C. Increases with increasing thickness of film | |
| 20. |
If the fraction of water vapour at 127 Degree Celsius and 1 atm is 0.5, what is the fraction of water vapour at 27 Degree C and 1 atm? |
| A. | 0.275 |
| B. | 0.375 |
| C. | 0.475 |
| D. | 0.875 |
| Answer» C. 0.475 | |
| 21. |
A process is carried out for the feed mixture of 80% air and 20% CO2, the compressor recovered 50% of CO2, what is the exit pressure of the compressor, if the partial pressure of CO2 is 15 mm Hg? |
| A. | 135 mm Hg |
| B. | 145 mm Hg |
| C. | 175 mm Hg |
| D. | 200 mm Hg |
| Answer» B. 145 mm Hg | |
| 22. |
A plate condenser was designed to be kept vertical. How would the condensation coefficient be effected if due to site constraints, it has to be kept at 60 degree to the horizontal? |
| A. | 1.53% reduction in condensation coefficient |
| B. | 2.53% reduction in condensation coefficient |
| C. | 3.53% reduction in condensation coefficient |
| D. | 4.53% reduction in condensation coefficient |
| Answer» D. 4.53% reduction in condensation coefficient | |
| 23. |
When the vapour is condensed at constant system pressure, the pressure changes. |
| A. | Correct statement |
| B. | Incorrect statement |
| C. | Can`t say anything |
| D. | None of the mentioned |
| Answer» B. Incorrect statement | |
| 24. |
A process is carried out for the feed mixture of 95% air and 5% ammonia vapor, the compressor recovered 40% of ammonia, what is the exit pressure of the compressor, if the partial pressure of ammonia vapor is 10 mm Hg? |
| A. | 225.4 mm Hg |
| B. | 326.8 mm Hg |
| C. | 451.2 mm Hg |
| D. | 593.5 mm Hg |
| Answer» C. 451.2 mm Hg | |
| 25. |
Depending upon the behavior of condensate up on the cooled surface, the condensation process are classified into how many distinct modes? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 26. |
When gas changes to liquid through the process of condensation, the temperature |
| A. | Increases |
| B. | Decreases |
| C. | Remains constant |
| D. | None of the mentioned |
| Answer» D. None of the mentioned | |
| 27. |
A process is carried out for the feed mixture of 90% air and 10% water vapor, the compressor recovered 90% of water, what is the exit pressure of the compressor if the partial pressure of water vapor is 50 mm Hg? |
| A. | 286.1 mm Hg |
| B. | 396.4 mm Hg |
| C. | 458.7 mm Hg |
| D. | 529.5 mm Hg |
| Answer» D. 529.5 mm Hg | |
| 28. |
Consider the following statements |
| A. | If a condensing liquid does not wet a surface, then drop wise condensation will not take place on it |
| B. | Drop wise condensation gives a higher transfer rate than film wise condensation |
| C. | Reynolds number of condensing liquid is based on its mass flow rate |
| D. | Suitable coating or vapor additive is used to promote film wise condensation |
| Answer» E. | |
| 29. |
Condensation starts ________ point. |
| A. | Dew point |
| B. | Bubble point |
| C. | Triple point |
| D. | None of the mentioned |
| Answer» B. Bubble point | |
| 30. |
What is the fraction of water vapor at 27oC and 1 atm, if the fraction of water vapor at 127oC and 1 atm is 0.8? |
| A. | 0.2 |
| B. | 0.4 |
| C. | 0.6 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 31. |
Drop wise condensation usually occurs on |
| A. | Oily surface |
| B. | Glazed surface |
| C. | Smooth surface |
| D. | Coated surface |
| Answer» B. Glazed surface | |
| 32. |
When vapour is compressed isothermally the ____________ changes. |
| A. | Volume |
| B. | Pressure |
| C. | Temperature |
| D. | None of the mentioned |
| Answer» B. Pressure | |
| 33. |
If the fraction of water vapor at 27oC and 5 atm is 0.5, then what is the fraction of water vapor at 27oC and 1 atm? |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.5 |
| D. | 0.8 |
| Answer» B. 0.2 | |
| 34. |
The convective coefficients for condensation usually lie in the range |
| A. | 30-300 W/m<sup>2</sup> K |
| B. | 60-3000 W/m<sup>2</sup> K |
| C. | 300-10000 W/m<sup>2</sup> K |
| D. | 2500-10000 W/m<sup>2</sup> K |
| Answer» E. | |
| 35. |
When vapour is cooled at constant total system volume, the _______ changes. |
| A. | Volume |
| B. | Pressure |
| C. | Temperature |
| D. | None of the mentioned |
| Answer» C. Temperature | |
| 36. |
Condensation starts at which point? |
| A. | Dew point |
| B. | Bubble point |
| C. | Triple point |
| D. | None of the mentioned |
| Answer» B. Bubble point | |
| 37. |
Condensation process is very common in |
| A. | Boilers |
| B. | Condensers |
| C. | Evaporators |
| Answer» D. | |
| 38. |
In a condensation process, _______ to _________ |
| A. | Gas, Solid |
| B. | Gas, Liquid |
| C. | Liquid, Gas |
| D. | Liquid, Solid |
| Answer» C. Liquid, Gas | |
| 39. |
Which of the following is not a way of condensation of vapor? |
| A. | Cooling at constant volume |
| B. | Cooling at constant pressure |
| C. | Compress it isothermally |
| D. | Compress it |
| Answer» E. | |
| 40. |
Which of the following defines condensation? |
| A. | Change of solid to vapor |
| B. | Change of vapor to liquid |
| C. | Change of liquid to vapor |
| D. | Change of vapor to solid |
| Answer» C. Change of liquid to vapor | |