MCQOPTIONS
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MCQOPTIONS
This section includes 23 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. |
Which of these equations for an ammonia stripping tower is true. |
| A. | Z = HTU X NTU |
| B. | Z= HTU/NTU |
| C. | Z= NTU/HTU |
| D. | Z= HTU2/NTU |
| Answer» B. Z= HTU/NTU | |
| 2. |
What is the temperature required for thermal destruction? |
| A. | 330˚F |
| B. | 420˚F |
| C. | 550˚F |
| D. | 670˚F |
| Answer» D. 670˚F | |
| 3. |
Which of the following is an advantage of closed loop? |
| A. | Initial cost |
| B. | Operating cost |
| C. | Disposal of concentrated ammonia sulphate |
| D. | Air emissions |
| Answer» E. | |
| 4. |
WHICH_OF_THE_FOLLOWING_IS_AN_ADVANTAGE_OF_CLOSED_LOOP??$ |
| A. | Initial cost |
| B. | Operating cost |
| C. | Disposal of concentrated ammonia sulphate |
| D. | Air emissions |
| Answer» E. | |
| 5. |
Which of these equations for an ammonia stripping tower is true.$ |
| A. | Z = HTU X NTU |
| B. | Z= HTU/NTU |
| C. | Z= NTU/HTU |
| D. | Z= HTU2/NTU |
| Answer» B. Z= HTU/NTU | |
| 6. |
What_is_the_temperature_required_for_thermal_destruction?$ |
| A. | 330ÀöF |
| B. | 420ÀöF |
| C. | 550ÀöF |
| D. | 670ÀöF |
| Answer» D. 670‚àö√Ñ‚àö‚àÇF | |
| 7. |
What is the packing depth maintained for an ammonia stripping tower? |
| A. | 2-6 m |
| B. | 6-10 m |
| C. | 10-14 m |
| D. | 14-18 m |
| Answer» C. 10-14 m | |
| 8. |
What is the packing depth maintained for an ammonia stripping tower for the removal of volatile organic compounds? |
| A. | 1-6 m |
| B. | 6-8 m |
| C. | 8-12 m |
| D. | 12-16 m |
| Answer» B. 6-8 m | |
| 9. |
At what pH should be the wastewater be maintained in order to remove the Volatile organic compounds? |
| A. | 5.5-8.5 |
| B. | 8.5-11.5 |
| C. | 12-15 |
| D. | 15-18 |
| Answer» B. 8.5-11.5 | |
| 10. |
What is the allowable pressure drop assumed for the ammonia stripping tower to remove ammonia? |
| A. | 800-1200{N/m<sup>2</sup>}/m |
| B. | 100-400{N/m<sup>2</sup>}/m |
| C. | 400-800{N/m<sup>2</sup>}/m |
| D. | 1200-1600{N/m<sup>2</sup>}/m |
| Answer» C. 400-800{N/m<sup>2</sup>}/m | |
| 11. |
What is the stripping factor assumed for the ammonia stripping tower to remove ammonia? |
| A. | 1.5-5 |
| B. | 5-9 |
| C. | 9-13 |
| D. | 13-15 |
| Answer» B. 5-9 | |
| 12. |
What is the stripping factor assumed for the ammonia stripping tower to remove volatile organic carbon? |
| A. | 1.5-5 |
| B. | 5-9 |
| C. | 9-13 |
| D. | 13-17 |
| Answer» B. 5-9 | |
| 13. |
What is the liquid loading rate assumed for an ammonia stripping tower for the removal of ammonia? |
| A. | 200-500 L /m<sup>2</sup>min |
| B. | 40-80 L /m<sup>2</sup>min |
| C. | 80-200 L /m<sup>2</sup>min |
| D. | 20-40 L /m<sup>2</sup>min |
| Answer» C. 80-200 L /m<sup>2</sup>min | |
| 14. |
What is the liquid loading rate assumed for an ammonia stripping tower for the removal of volatile organic carbon? |
| A. | 400-500 L /m<sup>2</sup>min |
| B. | 500-600 L /m<sup>2</sup>min |
| C. | 600-1800 L /m<sup>2</sup>min |
| D. | 1800-2500 L /m<sup>2</sup>min |
| Answer» D. 1800-2500 L /m<sup>2</sup>min | |
| 15. |
How is the height of the transfer unit expressed? |
| A. | HTU = L/K<sub>la</sub>A |
| B. | HTU = L X K<sub>la</sub>A |
| C. | HTU = L2 X K<sub>la</sub>A |
| D. | HTU = L2 / K<sub>la</sub>A |
| Answer» B. HTU = L X K<sub>la</sub>A | |
| 16. |
What is the most favourable pH for the operation? |
| A. | 7 |
| B. | 8.5 |
| C. | 11 |
| D. | 13 |
| Answer» D. 13 | |
| 17. |
Which of the below factors do not favour high efficiency? |
| A. | High pH |
| B. | Low temperature |
| C. | High air flow |
| D. | Greater packed bed depth |
| Answer» C. High air flow | |
| 18. |
The higher the temperature, the lower the________ |
| A. | Ammonia ions |
| B. | Air flow |
| C. | pH |
| D. | Reaction |
| Answer» C. pH | |
| 19. |
Percentage of dissolved gas ________ with temperature and pH. |
| A. | Increases |
| B. | Decreases |
| C. | Does not alter |
| D. | Fluctuates |
| Answer» B. Decreases | |
| 20. |
What is the state of ammonia above a pH of 12? |
| A. | Dissolved gas |
| B. | Ammonia ions |
| C. | Soluble ions |
| D. | Inert gas |
| Answer» B. Ammonia ions | |
| 21. |
Above pH 7, ammonia will be in the form of soluble ammonia ions. |
| A. | True |
| B. | False |
| Answer» C. | |
| 22. |
What is the limit of ammonia content for which ammonia stripping is suited? |
| A. | 10 mg/l |
| B. | 50 mg/l |
| C. | 75 mg/l |
| D. | 100 mg/l |
| Answer» E. | |
| 23. |
Ammonia stripping is done to increase ammonia content. |
| A. | True |
| B. | False |
| Answer» C. | |