MCQOPTIONS
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MCQOPTIONS
This section includes 16 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. |
What is the percentage of dry solids assumed for the sludge at the outlet of a centrifuge? |
| A. | 10-15% |
| B. | 1-3% |
| C. | 4-8% |
| D. | 9-12% |
| Answer» D. 9-12% | |
| 2. |
What is the % of dry solids assumed for a primary sludge from a settling tank at the outlet? |
| A. | 12% |
| B. | 5-7% |
| C. | 8% |
| D. | 9-11% |
| Answer» C. 8% | |
| 3. |
How does the activated sludge appear? |
| A. | Gray |
| B. | Red |
| C. | Brown and flocculant like appearance |
| D. | Greasy |
| Answer» D. Greasy | |
| 4. |
How does the chemical sludge appear? |
| A. | Gray in colour and not slimy |
| B. | Brown and flocculant like appearance |
| C. | Red/grayish brown |
| D. | Black in colour |
| Answer» D. Black in colour | |
| 5. |
Sludge from the primary clarifier is ______ |
| A. | Brown and flocculant like appearance |
| B. | Dark in colour |
| C. | Gray and slimy |
| D. | Dark brown in colour |
| Answer» D. Dark brown in colour | |
| 6. |
Ws = Wsp + WssWhat does Wsp stand for in the above equation? |
| A. | Total dry solids |
| B. | Raw primary solids |
| C. | Suspended solids |
| D. | Polluted solids |
| Answer» C. Suspended solids | |
| 7. |
What is the percentage of aerobically digested sludge? |
| A. | 0.2-0.5 |
| B. | 0.3-0.6 |
| C. | 1.0-2.0 |
| D. | 1.5-3.0 |
| Answer» D. 1.5-3.0 | |
| 8. |
What is the amount of solids released into wastewater by human beings? |
| A. | 30 gpcd |
| B. | 40 gpcd |
| C. | 60 gpcd |
| D. | 70 gpcd |
| Answer» E. | |
| 9. |
What is the first step in the sewage treatment process? |
| A. | Dewatering |
| B. | Thickening |
| C. | Phosphorus recovery |
| D. | Digestion? |
| Answer» C. Phosphorus recovery | |
| 10. |
In which year was the term Biosolids introduced? |
| A. | 1990 |
| B. | 1995 |
| C. | 1998 |
| D. | 2000 |
| Answer» D. 2000 | |
| 11. |
What is the term used for reuse of sewage sludge? |
| A. | Compost |
| B. | Solids |
| C. | Biosolids |
| D. | Sludge |
| Answer» D. Sludge | |
| 12. |
From which of the following methods can toxic chemicals be removed? |
| A. | Sorption |
| B. | Adsorption |
| C. | Absorption |
| D. | Dewatering |
| Answer» B. Adsorption | |
| 13. |
Which of the following methods are used in rural communities? |
| A. | Aerobic digestion |
| B. | Mechanical dewatering |
| C. | Dewatering |
| D. | Composting |
| Answer» E. | |
| 14. |
Sludge treatment helps is reducing treatment costs. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
Secondary sludge includes treated sewage sludge. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 16. |
Primary sludge includes __________ |
| A. | Total suspended solids |
| B. | Suspended solids |
| C. | Removable solids |
| D. | Settleable solids |
| Answer» E. | |