MCQOPTIONS
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MCQOPTIONS
This section includes 50 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Chemistry knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the feed flow for a two stage pass for the following data.Recovery: 85℅Permeate flow: 100 m3/hr |
| A. | 310 m3/hr |
| B. | 320 m3/hr |
| C. | 325 m3/hr |
| D. | 305 m3/hr |
| Answer» B. 320 m3/hr | |
| 2. |
What is a recovery? |
| A. | Permeate flow/ Feed flow |
| B. | Reject flow/ Feed flow |
| C. | Permeate flow/ Reject flow |
| D. | Feed flow/ Permeate flow |
| Answer» B. Reject flow/ Feed flow | |
| 3. |
The molecular weight greater than _____ is likely rejected by an RO system. |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» E. | |
| 4. |
What is the percentage of dissolved salts achieved from the RO unit? |
| A. | 30-40% |
| B. | 50-65% |
| C. | 75-85% |
| D. | 95-999% |
| Answer» E. | |
| 5. |
Reverse osmosis helps in mineralizing water. |
| A. | True |
| B. | False |
| Answer» C. | |
| 6. |
The total hardness of the potable water should be less than ___________ |
| A. | 500 ppm |
| B. | 700 ppm |
| C. | 900 ppm |
| D. | 1000 ppm |
| Answer» B. 700 ppm | |
| 7. |
The pH for the potable water should be in the range of ___________ |
| A. | 5-6 |
| B. | 7-8.5 |
| C. | 9-10 |
| D. | 12-13 |
| Answer» C. 9-10 | |
| 8. |
The process of reverse osmosis is also known as ___________ |
| A. | Hyper-filtration |
| B. | Double-filtration |
| C. | Double-osmosis |
| D. | Hyper-osmosis |
| Answer» B. Double-filtration | |
| 9. |
The pressure which is applied to separate the water from its contaminants is of the order ___________ |
| A. | 5-10 kg/cm2 |
| B. | 15-40 kg/cm2 |
| C. | 50-100 kg/cm2 |
| D. | 100-150 kg/cm2 |
| Answer» C. 50-100 kg/cm2 | |
| 10. |
The basis of reverse osmosis is _____________ |
| A. | Osmotic pressure is greater than the hydrostatic pressure |
| B. | Osmotic pressure is equal to the hydrostatic pressure |
| C. | Hydrostatic pressure is greater than the osmotic pressure |
| D. | Osmotic pressure does not exist |
| Answer» D. Osmotic pressure does not exist | |
| 11. |
What is a normal tolerance value for concentration polarization coefficient? |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.3 |
| D. | 0.5 |
| Answer» C. 0.3 | |
| 12. |
Which of the following is not a use of reverse osmosis? |
| A. | Treatment of industrial waste water to remove heavy metal ions |
| B. | Separation of sulfites and bisulfites from paper and processing industry effluents |
| C. | Treatment of municipal water to remove inorganic salts |
| D. | Treatment of industrial effluents to decolorize it |
| Answer» E. | |
| 13. |
If the Temperature is 300K and the concentration of solute(CB) is 0.3, what is the osmotic pressure? |
| A. | 50R |
| B. | 60R |
| C. | 70R |
| D. | 90R |
| Answer» E. | |
| 14. |
If the Temperature is 300K and the concentration of solute(CB) is 0.75, what is the osmotic pressure? |
| A. | 150R |
| B. | 200R |
| C. | 225R |
| D. | 325R |
| Answer» D. 325R | |
| 15. |
If the Temperature is 350K and the concentration of solute(CB) is 0.6, what is the osmotic pressure? |
| A. | 150R |
| B. | 167R |
| C. | 175R |
| D. | 350R |
| Answer» D. 350R | |
| 16. |
If the Temperature is 100K and the concentration of solute(CB) is 0.6, what is the osmotic pressure? |
| A. | 150R |
| B. | 200R |
| C. | 600R |
| D. | 60R |
| Answer» E. | |
| 17. |
If the Temperature is 400K and the concentration of solute(CB) is 0.5, what is the osmotic pressure? |
| A. | 150R |
| B. | 200R |
| C. | 300R |
| D. | 350R |
| Answer» C. 300R | |
| 18. |
If the Temperature is 300K and the concentration of solute(CB) is 0.5, what is the osmotic pressure? |
| A. | 150R |
| B. | 200R |
| C. | 300R |
| D. | 350R |
| Answer» B. 200R | |
| 19. |
Why is osmosis not a good separation process? |
| A. | Because it involves semipermeable membrane |
| B. | Because it transfers solvent from wrong direction |
| C. | Because it involves movement of solute particles |
| D. | Because it requires high temperatures |
| Answer» C. Because it involves movement of solute particles | |
| 20. |
WHAT_IS_THE_PERCENTAGE_OF_DISSOLVED_SALTS_ACHIEVED_FROM_THE_RO_UNIT??$ |
| A. | 30-40% |
| B. | 50-65% |
| C. | 75-85% |
| D. | 95-999% |
| Answer» E. | |
| 21. |
WHICH_OF_THE_FOLLOWING_IS_NOT_A_USE_OF_REVERSE_OSMOSIS??$ |
| A. | Treatment of industrial waste water to remove heavy metal ions |
| B. | Separation of sulfites and bisulfites from paper and processing industry effluents |
| C. | Treatment of municipal water to remove inorganic salts |
| D. | Treatment of industrial effluents to decolorize it |
| Answer» E. | |
| 22. |
THE_PH_FOR_THE_POTABLE_WATER_SHOULD_BE_IN_THE_RANGE_OF?$ |
| A. | 5-6 |
| B. | 7-8.5 |
| C. | 9-10 |
| D. | 12-13 |
| Answer» C. 9-10 | |
| 23. |
What is a recovery? |
| A. | Permeate flow/ Feed flow |
| B. | Reject flow/ Feed flow |
| C. | Permeate flow/ Reject flow |
| D. | Feed flow/ Permeate flow |
| Answer» B. Reject flow/ Feed flow | |
| 24. |
The molecular weight greater than _____ is likely rejected by an RO system.$ |
| A. | 50 |
| B. | 100 |
| C. | 150 |
| D. | 200 |
| Answer» E. | |
| 25. |
What is a normal tolerance value for concentration polarization coefficient?$ |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.3 |
| D. | 0.5 |
| Answer» C. 0.3 | |
| 26. |
The_total_hardness_of_the_potable_water_should_be_less_than$ |
| A. | 500 ppm |
| B. | 700 ppm |
| C. | 900 ppm |
| D. | 1000 ppm |
| Answer» B. 700 ppm | |
| 27. |
Calculate the feed flow for a two stage pass for the following data. |
| A. | |
| B. | |
| Answer» B. | |
| 28. |
What is the average pressure at which the reverse osmosis operates for treating brackish water? |
| A. | 100-200 psi |
| B. | 250-600 psi |
| C. | 600-800 psi |
| D. | 800-1200 psi |
| Answer» C. 600-800 psi | |
| 29. |
What is the average pressure at which the reverse osmosis operates for sea water desalination? |
| A. | 800-1000 psi |
| B. | 1000-2000 psi |
| C. | 2000-3000 psi |
| D. | 5000-8000 psi |
| Answer» B. 1000-2000 psi | |
| 30. |
How is the salt flux expressed mathematically? |
| A. | F<sub>s</sub>= K<sub>s</sub> ∆ C<sub>s</sub> |
| B. | F<sub>s</sub>= K<sub>s</sub> /∆ C<sub>s</sub> |
| C. | F<sub>s</sub>= K<sub>s</sub> 2∆ C<sub>s</sub> |
| D. | F<sub>s</sub>= K<sub>s</sub> |
| Answer» B. F<sub>s</sub>= K<sub>s</sub> /‚Äö√Ñ√∂‚àö‚Ć‚àö√∫ C<sub>s</sub> | |
| 31. |
How is the permeate flux expressed mathematically? |
| A. | F<sub>w</sub>= K<sub>w</sub>(∆ p- ∆∏) |
| B. | F<sub>w</sub>= ∆ p- ∆∏ |
| C. | F<sub>w</sub>= K<sub>w</sub>∆∏ |
| D. | F<sub>w</sub>= K<sub>w</sub>(∆ p- ∆∏) |
| Answer» E. | |
| 32. |
What is the concentration factor? |
| A. | 1/ recovery |
| B. | 1/(1-recovery) |
| C. | 1- recovery |
| D. | Recovery X permeate flow |
| Answer» C. 1- recovery | |
| 33. |
What is salt rejection? |
| A. | 1- salt passage |
| B. | Reject flow X ( 1- salt passage) |
| C. | (1-salt passage)/ reject flow |
| D. | Reject flow/ salt passage |
| Answer» B. Reject flow X ( 1- salt passage) | |
| 34. |
What is the other name for reject stream? |
| A. | Permeate |
| B. | Non-concentrated stream |
| C. | Brine stream |
| D. | Polluted water stream |
| Answer» D. Polluted water stream | |
| 35. |
Select the incorrect statement about reverse osmosis from the following option? |
| A. | It is simple and reliable process |
| B. | It is relatively energy efficient |
| C. | It operates at a comparatively high temperature |
| D. | The life of an SPM is about 2 years and it can be easily replaced within a few minutes |
| Answer» D. The life of an SPM is about 2 years and it can be easily replaced within a few minutes | |
| 36. |
If the Temperature is 300K and the concentration of solute(CB) is 0.75, what is the osmotic pressure? |
| A. | 150R |
| B. | 200R |
| C. | 225R |
| D. | 325R |
| Answer» D. 325R | |
| 37. |
The desalinated water is called ________ |
| A. | Clean water |
| B. | Clear water |
| C. | Pure water |
| D. | Permeate |
| Answer» E. | |
| 38. |
Which of the following is not an application of reverse osmosis? |
| A. | Desalination |
| B. | Reclamation of minerals |
| C. | For dialysis in hospitals |
| D. | For industrial use |
| Answer» E. | |
| 39. |
The amount of pressure to be applied depends on ______ |
| A. | Organic content |
| B. | Salt concentration |
| C. | Bacteria |
| D. | Membrane strength |
| Answer» C. Bacteria | |
| 40. |
The process of reverse osmosis is also known as |
| A. | Hyper-filtration |
| B. | Double-filtration |
| C. | Double-osmosis |
| D. | Hyper-osmosis |
| Answer» B. Double-filtration | |
| 41. |
In RO, pressure that is greater than the naturally occurring osmotic pressure is applied in order to ______ |
| A. | Mineralize water |
| B. | Desalinate water |
| C. | Decompose organics |
| D. | Push bacteria across membrane |
| Answer» C. Decompose organics | |
| 42. |
The pressure which is applied to separate the water from its contaminants is of the order |
| A. | 5-10 kg/cm<sup>2</sup> |
| B. | 15-40 kg/cm<sup>2</sup> |
| C. | 50-100 kg/cm<sup>2</sup> |
| D. | 100-150 kg/cm<sup>2</sup> |
| Answer» C. 50-100 kg/cm<sup>2</sup> | |
| 43. |
A reverse osmosis membrane is a semi-permeable membrane that allows the passage of _________ |
| A. | Water |
| B. | Dissolved salts |
| C. | Organics |
| D. | Bacteria |
| Answer» B. Dissolved salts | |
| 44. |
Which of the following is not used for semi-permeable membrane? |
| A. | Polymethyl sulphate |
| B. | Cellulose acetate |
| C. | Polyamide polymer |
| D. | Polymethyl acrylate |
| Answer» B. Cellulose acetate | |
| 45. |
______ is used for the RO process. |
| A. | Highly permeable membrane |
| B. | Permeable membrane |
| C. | Semi-permeable membrane |
| D. | Non-permeable membrane |
| Answer» D. Non-permeable membrane | |
| 46. |
If the Temperature is 300K and the concentration of solute(CB) is 0.5, what is the osmotic pressure? |
| A. | 150R |
| B. | 200R |
| C. | 300R |
| D. | 350R |
| Answer» B. 200R | |
| 47. |
Semi-permeable membrane is selective membrane which does not permit the passage of dissolved ________ particles. |
| A. | Solvent |
| B. | Solute |
| C. | Anhydrous |
| D. | Saturated |
| Answer» C. Anhydrous | |
| 48. |
Osmosis is a process where a stronger saline solution will tend to migrate to a weaker saline solution. |
| A. | True |
| B. | False |
| Answer» C. | |
| 49. |
What is the principle of reverse osmosis? |
| A. | The direction of solvent flow Can be reversed by applying pressure greater than osmotic pressure |
| B. | The direction of solvent flow can be reversed by applying pressure less than osmotic pressure |
| C. | The direction of solvent flow can be reversed by using a permeable membrane |
| D. | The solvent flow can be reversed by concentrating the mixture |
| Answer» B. The direction of solvent flow can be reversed by applying pressure less than osmotic pressure | |
| 50. |
The basis of reverse osmosis is |
| A. | Osmotic pressure is greater than the hydrostatic pressure |
| B. | Osmotic pressure is equal to the hydrostatic pressure |
| C. | Hydrostatic pressure is greater than the osmotic pressure |
| D. | Osmotic pressure does not exist |
| Answer» D. Osmotic pressure does not exist | |