MCQOPTIONS
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MCQOPTIONS
This section includes 28 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 volumetric organic loading in Kg COD/ m3 day for an anaerobic sequence batch reactor? |
| A. | 4-6 |
| B. | 1.2-2.4 |
| C. | 2.6-3.4 |
| D. | 6.4-7.6 |
| Answer» C. 2.6-3.4 | |
| 2. |
What is the volumetric organic loading in Kg COD/ m3 day for an anaerobic contact digestion process? |
| A. | 1-8 |
| B. | 8-10 |
| C. | 10-12 |
| D. | 12-15 |
| Answer» B. 8-10 | |
| 3. |
What is the volumetric organic loading in Kg COD/ m3 day for a completely mixed anaerobic digestion process? |
| A. | 1-5 |
| B. | 5-7 |
| C. | 7-9 |
| D. | 9-12 |
| Answer» B. 5-7 | |
| 4. |
What is the optimum temperature at which anaerobic digestion is carried out? |
| A. | 25-35 degree Celsius |
| B. | 55 degree Celsius |
| C. | 45 degree Celsius |
| D. | 40-50 degree Celsius |
| Answer» B. 55 degree Celsius | |
| 5. |
In anaerobic digestion system which of the following statement holds good? |
| A. | Acids are necessary to be added to make the pH neutral |
| B. | Alkalines are necessary to be added to make the pH neutral |
| C. | A flocculant is to be added to bring about flocculation |
| D. | A coagulant is necessary to be added in order to bring about coagulation |
| Answer» C. A flocculant is to be added to bring about flocculation | |
| 6. |
How much is the cow yield from anaerobic digestion that can be obtained? |
| A. | 0.1 m3/Kg dung |
| B. | 0.2 m3/Kg dung |
| C. | 0.3 m3/Kg dung |
| D. | 0.4 m3/Kg dung |
| Answer» E. | |
| 7. |
What is the range of retention time during anaerobic digestion? |
| A. | 10-20 days |
| B. | 20-30 days |
| C. | 40-80 days |
| D. | 40-100 days |
| Answer» E. | |
| 8. |
The pathogens in digestate are _________ |
| A. | Highly active |
| B. | Inactive |
| C. | Partly inactive |
| D. | Neutral |
| Answer» D. Neutral | |
| 9. |
WHAT_IS_THE_RANGE_OF_RETENTION_TIME_DURING_ANAEROBIC_DIGESTION??$ |
| A. | 10-20 days |
| B. | 20-30 days |
| C. | 40-80 days |
| D. | 40-100 days |
| Answer» E. | |
| 10. |
In anaerobic digestion system which of the following statement holds good?$ |
| A. | Acids are necessary to be added to make the pH neutral |
| B. | Alkalines are necessary to be added to make the pH neutral |
| C. | A flocculant is to be added to bring about flocculation |
| D. | A coagulant is necessary to be added in order to bring about coagulation |
| Answer» C. A flocculant is to be added to bring about flocculation | |
| 11. |
How_much_is_the_cow_yield_from_anaerobic_digestion_that_can_be_obtained?$ |
| A. | 0.1 m<sup>3</sup>/Kg dung |
| B. | 0.2 m<sup>3</sup>/Kg dung |
| C. | 0.3 m<sup>3</sup>/Kg dung |
| D. | 0.4 m<sup>3</sup>/Kg dung |
| Answer» E. | |
| 12. |
What is the hydraulic retention time for a completely mixed anaerobic contact type process? |
| A. | 8-10 days |
| B. | 5-8 days |
| C. | 0.5-5 days |
| D. | 10-12 days |
| Answer» D. 10-12 days | |
| 13. |
What is the hydraulic retention time for a completely mixed anaerobic digestion process? |
| A. | 15-30 days |
| B. | 40-50 days |
| C. | 50-60 days |
| D. | 60-80 days |
| Answer» B. 40-50 days | |
| 14. |
What is the volumetric organic loading in Kg COD/ m3 day for an anaerobic sequence batch reactor? |
| A. | 4-6 |
| B. | 1.2-2.4 |
| C. | 2.6-3.4 |
| D. | 6.4-7.6 |
| Answer» C. 2.6-3.4 | |
| 15. |
What is the volumetric organic loading in Kg COD/ m3 day for an anaerobic contact digestion process? |
| A. | 1-8 |
| B. | 8-10 |
| C. | 10-12 |
| D. | 12-15 |
| Answer» B. 8-10 | |
| 16. |
What is the volumetric organic loading in Kg COD/ m3 day for a completely mixed anaerobic digestion process? |
| A. | 1-5 |
| B. | 5-7 |
| C. | 7-9 |
| D. | 9-12 |
| Answer» B. 5-7 | |
| 17. |
What is the rate limiting step in anaerobic digestion? |
| A. | Methanogenesis |
| B. | Hydrolysis |
| C. | Acidification |
| D. | Biogas production |
| Answer» B. Hydrolysis | |
| 18. |
What is the percentage of Carbon dioxide produced during anaerobic digestion? |
| A. | 70-80% |
| B. | 80-90% |
| C. | 30-50% |
| D. | 50-60% |
| Answer» D. 50-60% | |
| 19. |
For what range of COD level anaerobic digestion is carried out? |
| A. | 400-800 |
| B. | 900-1200 |
| C. | 1500-2000 |
| D. | 300-400 |
| Answer» D. 300-400 | |
| 20. |
What_is_the_optimum_temperature_at_which_anaerobic_digestion_is_carried_out? |
| A. | 25-35 degree Celsius |
| B. | 55 degree Celsius |
| C. | 45 degree Celsius |
| D. | 40-50 degree Celsius |
| Answer» B. 55 degree Celsius | |
| 21. |
The pathogens in digestate are ________? |
| A. | Highly active |
| B. | Inactive |
| C. | Partly inactive |
| D. | Neutral |
| Answer» D. Neutral | |
| 22. |
What is the temperature that needs to be maintained during the process? |
| A. | 90ÀöF |
| B. | 95ÀöF |
| C. | 100ÀöF |
| D. | 105ÀöF |
| Answer» D. 105‚àö√Ñ‚àö‚àÇF | |
| 23. |
How many steps are present in anaerobic digestion? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 24. |
What is the percentage of methane in the biogas? |
| A. | 10-20 % |
| B. | 20-40 % |
| C. | 45-65 % |
| D. | 55-75 % |
| Answer» E. | |
| 25. |
What is biogas composed of? |
| A. | O<sub>2</sub> and CO<sub>2</sub> |
| B. | CO<sub>2</sub> and NO<sub>2</sub> |
| C. | CH<sub>4</sub> and O<sub>2</sub> |
| D. | CH<sub>4</sub> and CO<sub>2</sub> |
| Answer» E. | |
| 26. |
_________ uses anaerobic digestion. |
| A. | Incineration |
| B. | Combustion |
| C. | Fermentation |
| D. | Oxygenation |
| Answer» B. Combustion | |
| 27. |
Anaerobic digestion can be used to produce fuel. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 28. |
Anaerobic digestion occurs in the presence of oxygen. |
| A. | True |
| B. | False |
| Answer» C. | |