MCQOPTIONS
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MCQOPTIONS
This section includes 19 Mcqs, each offering curated multiple-choice questions to sharpen your Waste Water Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Calculate the fast rinse period of the regenerant liquid for a softener system with the given below data.Calcium Load: 40 ppm as CaCO3Capacity: 37 Kg/m3Correction factor: 0.9Flow rate: 235 m3/hrOperation hours: 10 hrs |
| A. | 25 mins |
| B. | 30 mins |
| C. | 20 mins |
| D. | 15 mins |
| Answer» B. 30 mins | |
| 2. |
Calculate the rinse volume of the regenerant liquid for the softener system with the given below data.Calcium Load: 60 ppm as CaCO3Capacity: 37 Kg/m3Correction factor: 0.9Flow rate: 35 m3/hrOperation hours: 10 hrs |
| A. | 1.5 m3/hr |
| B. | 3.5 m3/hr |
| C. | 4.9 m3/hr |
| D. | 2.5 m3/hr |
| Answer» C. 4.9 m3/hr | |
| 3. |
Calculate the regenerant flow required for the softener system with the given below data.Calcium Load: 85 ppm as CaCO3Capacity: 37 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrs |
| A. | 25 m3/hr |
| B. | 28 m3/hr |
| C. | 12 m3/hr |
| D. | 21 m3/hr |
| Answer» E. | |
| 4. |
Calculate the fast rinse flow of the regenerant liquid for a softener with the below given data.Magnesium Load: 10 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrs |
| A. | 4.5 m3 /hr |
| B. | 7.2 m3/hr |
| C. | 1.7 m3 /hr |
| D. | 7.5 m3/hr |
| Answer» C. 1.7 m3 /hr | |
| 5. |
Calculate the diameter of the softener vessel required for the below given data.Magnesium Load: 500 ppm as CaCO3Capacity: 57 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrsLinear velocity: 16.6 m3/h/ m3Space velocity: 20 m3/h/ m3 |
| A. | 5.2 m |
| B. | 5.0 m |
| C. | 7.6 m |
| D. | 9.8 m |
| Answer» B. 5.0 m | |
| 6. |
Calculate the area of the softener vessel required for the following information.Magnesium Load: 180 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrsLinear velocity: 16.6 m3/h/ m3Space velocity: 20 m3/h/ m3 |
| A. | 8.5 m2 |
| B. | 11.6 m2 |
| C. | 9.7 m2 |
| D. | 8.5 m3 |
| Answer» C. 9.7 m2 | |
| 7. |
Calculate the theoretical softener resin bed depth for the following data:Magnesium Load: 130 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrsLinear velocity: 16.6 m3/h/ m3Space velocity: 20 m3/h/ m3 |
| A. | 1.5 m |
| B. | 1.2 m3 |
| C. | 2.6 m |
| D. | 2.5 m |
| Answer» C. 2.6 m | |
| 8. |
Calculate the amount of softener resin required for the following information.Magnesium: 80 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrs |
| A. | 4.5 m3 |
| B. | 3.5 m3 |
| C. | 5.1 m3 |
| D. | 2.5 m3 |
| Answer» D. 2.5 m3 | |
| 9. |
Which is the commonly used chelator? |
| A. | Rhodamine B |
| B. | EDTA |
| C. | Chlorine |
| D. | Bromine |
| Answer» C. Chlorine | |
| 10. |
________ is used in detergents to soften water. |
| A. | Hydraulic acid |
| B. | Sulphuric acid |
| C. | Citric acid |
| D. | Chlorine |
| Answer» D. Chlorine | |
| 11. |
WHICH_IS_THE_COMMONLY_USED_CHELATOR??$ |
| A. | Rhodamine B |
| B. | EDTA |
| C. | Chlorine |
| D. | Bromine |
| Answer» C. Chlorine | |
| 12. |
________ is used in detergents to soften water? |
| A. | Hydraulic acid |
| B. | Sulphuric acid |
| C. | Citric acid |
| D. | Chlorine |
| Answer» D. Chlorine | |
| 13. |
_____ is added to hard water to make it softer. |
| A. | Lime |
| B. | Chlorine |
| C. | Hydraulic acid |
| D. | Sulphuric acid |
| Answer» B. Chlorine | |
| 14. |
Ion exchange resins contain cation functional groups. |
| A. | True |
| B. | False |
| Answer» C. | |
| 15. |
Ion exchange resins are ______ |
| A. | Inorganic polymers |
| B. | Organic polymers |
| C. | Sandy materials |
| D. | Liquids |
| Answer» C. Sandy materials | |
| 16. |
Which of these methods does not remove hardness? |
| A. | Reverse osmosis |
| B. | Ion exchange resins |
| C. | Chelating agents |
| D. | Sedimentation |
| Answer» E. | |
| 17. |
________ form insoluble salts. |
| A. | Aluminium ions |
| B. | Sodium ions |
| C. | Calcium ions |
| D. | Manganese ions |
| Answer» D. Manganese ions | |
| 18. |
Soft water can foul plumbing. |
| A. | True |
| B. | False |
| Answer» C. | |
| 19. |
________ is the removal of calcium, magnesium and certain other metal cations in hard water. |
| A. | Disinfection |
| B. | Sedimentation |
| C. | Softening |
| D. | Cleaning |
| Answer» D. Cleaning | |