MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Environmental Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
BOD of sewage is dependent on food to microorganism ratio. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 2. |
The maximum BOD removal efficiency of the Step aeration process of the activated sludge system is ___________ |
| A. | 92% |
| B. | 80% |
| C. | 99% |
| D. | 78% |
| Answer» B. 80% | |
| 3. |
The design value of food to microorganism ratio in the tapered aeration sludge process is ___________ |
| A. | 0.1 |
| B. | 0.2 |
| C. | 0.4 |
| D. | 0.8 |
| Answer» D. 0.8 | |
| 4. |
_________ is defined as a volume in ml occupied by 1 gram of solid in the mixed liquor after 30 minutes of settling. |
| A. | BOD loading |
| B. | Suspended solid volume |
| C. | Sludge volume index |
| D. | Organic loading |
| Answer» D. Organic loading | |
| 5. |
The organic loading in an activated sludge plant is defined as ___________ |
| A. | Mass of BOD per day/Volume of the aeration tank |
| B. | Volume of aeration tank/Mass of BOD per day |
| C. | The mass of BOD per day/Volume of secondary clarifier |
| D. | Aeration period * Volume of aeration tank |
| Answer» B. Volume of aeration tank/Mass of BOD per day | |
| 6. |
The maximum aeration period for a conventional activated sludge system is ___________ |
| A. | 2 hours |
| B. | 3 hours |
| C. | 4 hours |
| D. | 6 hours |
| Answer» E. | |