MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 25 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. |
Determine the size of a flash mixer for the following data. Round off to the nearest digit.Flow rate: 2200 m3/hr |
| A. | 37 m3 |
| B. | 73 m3 |
| C. | 367 m3 |
| D. | 183 m3 |
| Answer» B. 73 m3 | |
| 2. |
What is the detention time assumed while designing a flash mixer? |
| A. | 2 mins |
| B. | 10 mins |
| C. | >10 mins |
| D. | 1min |
| Answer» E. | |
| 3. |
Calculate the volume of flocculator for the following data:Flow rate: 500m3/hr |
| A. | 355 m3 |
| B. | 155 m3 |
| C. | 167 m3 |
| D. | 285 m3 |
| Answer» D. 285 m3 | |
| 4. |
Calculate the volume of flocculator for the following data:Flow rate: 2200m3/hr |
| A. | 733 m3 |
| B. | 855 m3 |
| C. | 933 m3 |
| D. | 785 m3 |
| Answer» B. 855 m3 | |
| 5. |
Addition of which of these result in lowering the BOD level? |
| A. | Lime |
| B. | Polymer |
| C. | Aluminum salts |
| D. | Ferrous salts |
| Answer» C. Aluminum salts | |
| 6. |
At what pH is the solubility of FePO4 minimum? |
| A. | 3 |
| B. | 5.3 |
| C. | 4.3 |
| D. | 6.3 |
| Answer» C. 4.3 | |
| 7. |
At what pH is the solubility of AlPO4 minimum? |
| A. | 8 |
| B. | 6.3 |
| C. | 9.5 |
| D. | 10 |
| Answer» C. 9.5 | |
| 8. |
What is the ratio of Alum/Phosphate while adding alum to a waste water in order to remove the phosphates present? |
| A. | 1.4 : 2.5 |
| B. | 1 : 2 |
| C. | 3:5 |
| D. | 5:7 |
| Answer» B. 1 : 2 | |
| 9. |
What is the test used to select the type of coagulant required/ |
| A. | Bar test |
| B. | Jar test |
| C. | Stock test |
| D. | Coagulant test |
| Answer» C. Stock test | |
| 10. |
WHAT_IS_THE_RATIO_OF_ALUM/PHOSPHATE_WHILE_ADDING_ALUM_TO_A_WASTE_WATER_IN_ORDER_TO_REMOVE_THE_PHOSPHATES_PRESENT??$ |
| A. | 1.4 : 2.5 |
| B. | 1 : 2 |
| C. | 3:5 |
| D. | 5:7 |
| Answer» B. 1 : 2 | |
| 11. |
At what pH is the solubility of FePO4 minimum?$ |
| A. | 3 |
| B. | 5.3 |
| C. | 4.3 |
| D. | 6.3 |
| Answer» C. 4.3 | |
| 12. |
At_what_pH_is_the_solubility_of_AlPO4_minimum?$ |
| A. | 8 |
| B. | 6.3 |
| C. | 9.5 |
| D. | 10 |
| Answer» C. 9.5 | |
| 13. |
What is the ratio of Polymer/Phosphate while adding polymer to a waste water in order to remove the phosphates present? |
| A. | 1:3 |
| B. | 1 : 2 |
| C. | 3:5 |
| D. | 5:7 |
| Answer» B. 1 : 2 | |
| 14. |
Calculate the volume of flocculator for the following data: |
| A. | |
| B. | 733 m<sup>3</sup> |
| C. | 855 m<sup>3</sup> |
| Answer» B. 733 m<sup>3</sup> | |
| 15. |
What is the detention time assumed while designing a flocculator? |
| A. | 10 mins |
| B. | 20 mins |
| C. | 45 mins |
| D. | 60 mins |
| Answer» C. 45 mins | |
| 16. |
What is the ideal mixing time required for polymers? |
| A. | 60 secs |
| B. | 120 secs |
| C. | 10-30 secs |
| D. | 30-60 secs |
| Answer» D. 30-60 secs | |
| 17. |
Addition_of_which_of_these_result_in_lowering_the_BOD_level? |
| A. | Lime |
| B. | Polymer |
| C. | Aluminum salts |
| D. | Ferrous salts |
| Answer» C. Aluminum salts | |
| 18. |
What is the test used to select the type of coagulant required? |
| A. | Bar test |
| B. | Jar test |
| C. | Stock test |
| D. | Coagulant test |
| Answer» C. Stock test | |
| 19. |
1 micrometer = _______ |
| A. | 10<sup>-2</sup> m |
| B. | 10<sup>-3</sup> m |
| C. | 10<sup>-6</sup> m |
| D. | 10<sup>-9 </sup>m |
| Answer» D. 10<sup>-9 </sup>m | |
| 20. |
What is the chemical formula of aluminium sulphate? |
| A. | Al<sub>2</sub>(SO<sub>4</sub>)<sub>3</sub> |
| B. | Al(SO4)<sub>3</sub> |
| C. | Al<sub>2</sub>(SO<sub>4</sub>) |
| D. | Al(SO<sub>4</sub>) |
| Answer» B. Al(SO4)<sub>3</sub> | |
| 21. |
The clustered particles formed in the presence of a flocculant are called ______ |
| A. | Colloid |
| B. | Flocs |
| C. | Ion |
| D. | Polymer |
| Answer» C. Ion | |
| 22. |
What is the movement of solids in water called? |
| A. | Motion |
| B. | Brownian motion |
| C. | Horizontal motion |
| D. | Viscous motion |
| Answer» C. Horizontal motion | |
| 23. |
How many types of solids are present in water? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» B. 4 | |
| 24. |
What is the other name for deflocculation? |
| A. | Flocculation |
| B. | Peptisation |
| C. | Coagulation |
| D. | Dewatering |
| Answer» C. Coagulation | |
| 25. |
A process of contact and adhesion whereby the particles of a dispersion form larger-size clusters is called ________ |
| A. | Coagulation |
| B. | Flocculation |
| C. | Suspension |
| D. | Sedimentation |
| Answer» C. Suspension | |