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 is not a grit removal equipment installed in the aerated grit chamber? |
| A. | Screw conveyers |
| B. | Tubular conveyers |
| C. | Jet pumps |
| D. | Communitors |
| Answer» E. | |
| 2. |
What is the detention time considered for aerated grit chamber? |
| A. | 5-6 mins |
| B. | 2-5 mins |
| C. | 1-2 mins |
| D. | 3-4 mins |
| Answer» C. 1-2 mins | |
| 3. |
What is the horizontal velocity considered for grit chamber? |
| A. | 0.25-0.4m/sec |
| B. | 0.6-0.9 m/sec |
| C. | 1-2 m/sec |
| D. | 3-4m/sec |
| Answer» B. 0.6-0.9 m/sec | |
| 4. |
Stoke’s law holds good for Reynolds’s number ______ |
| A. | Less than 1 |
| B. | Equal to 1 |
| C. | Greater than 1 |
| D. | Nearer to 1 |
| Answer» B. Equal to 1 | |
| 5. |
WHAT_IS_THE_HORIZONTAL_VELOCITY_CONSIDERED_FOR_GRIT_CHAMBER??$ |
| A. | 0.25-0.4m/sec |
| B. | 0.6-0.9 m/sec |
| C. | 1-2 m/sec |
| D. | 3-4m/sec |
| Answer» B. 0.6-0.9 m/sec | |
| 6. |
Which of these is not a grit removal equipment installed in the aerated grit chamber?$ |
| A. | Screw conveyers |
| B. | Tubular conveyers |
| C. | Jet pumps |
| D. | Communitors |
| Answer» E. | |
| 7. |
What is the detention time considered for aerated grit chamber?$ |
| A. | 5-6 mins |
| B. | 2-5 mins |
| C. | 1-2 mins |
| D. | 3-4 mins |
| Answer» C. 1-2 mins | |
| 8. |
Aerated grit chambers are usually designed to remove particles in which range of size? |
| A. | 0.1mm diameter |
| B. | 0.35 mm diameter |
| C. | 0.21 mm diameter |
| D. | 0.41 mm diameter |
| Answer» D. 0.41 mm diameter | |
| 9. |
Usually while designing what is the range of depth of the aerated grit chamber assumed? |
| A. | 0.5-2 m |
| B. | 8-10 m |
| C. | 2-5 m |
| D. | 12 m |
| Answer» D. 12 m | |
| 10. |
Usually while designing what is the range of length of the aerated grit chamber assumed? |
| A. | 7.5-20 |
| B. | 4-6 m |
| C. | 25 m |
| D. | 50 m |
| Answer» B. 4-6 m | |
| 11. |
Usually while designing what is the range of the width of the aerated grit chamber assumed? |
| A. | 0.5-2 m |
| B. | 8-10 m |
| C. | 2.5-7.0m |
| D. | 12m |
| Answer» D. 12m | |
| 12. |
What is the amount of grit quantities captured by the aerated grit chamber? |
| A. | 0.004-0.20 m<sup>3</sup>/10<sup>3</sup>.m<sup>3</sup> |
| B. | 0.25 m<sup>3</sup>/10<sup>3</sup>.m<sup>3</sup> |
| C. | <0.004 m<sup>3</sup>/10<sup>3</sup>.m<sup>3</sup> |
| D. | 0.5 m<sup>3</sup>/10<sup>3</sup>.m<sup>3</sup> |
| Answer» B. 0.25 m<sup>3</sup>/10<sup>3</sup>.m<sup>3</sup> | |
| 13. |
At what depth are the air diffusers placed in the grit chamber? |
| A. | 0.6-0.9 m |
| B. | 1-2 m |
| C. | 0.1-0.4m |
| D. | 0.45-0.6 m |
| Answer» E. | |
| 14. |
What is the amount of air supplied for these grit chambers? |
| A. | 1-2 m<sup>3</sup>/m.min |
| B. | 0.2-0.5 m<sup>3</sup>/m.min |
| C. | 0.5-0.8 m<sup>3</sup>/m.min |
| D. | 0.8-1 m<sup>3</sup>/m.min |
| Answer» C. 0.5-0.8 m<sup>3</sup>/m.min | |
| 15. |
Stoke’s law holds good for Reynolds’s number _____?# |
| A. | Less than 1 |
| B. | Equal to 1 |
| C. | Greater than 1 |
| D. | Nearer to 1 |
| Answer» B. Equal to 1 | |
| 16. |
What is the specific gravity of settleable particles in the grit chamber? |
| A. | 2.98 |
| B. | 2.56 |
| C. | 2.65 |
| D. | 2.89 |
| Answer» D. 2.89 | |
| 17. |
Grit chamber is similar to which of the following? |
| A. | Screening unit |
| B. | Sedimentation tank |
| C. | Coagulation tank |
| D. | Sand bed |
| Answer» C. Coagulation tank | |
| 18. |
What is the cleaning period for manual grit chambers? |
| A. | 3 days |
| B. | 5 days |
| C. | 48 hours |
| D. | 1 week |
| Answer» E. | |
| 19. |
Grit chambers are constructed to prevent their accumulation in _______ |
| A. | Sedimentation tank |
| B. | Sludge digesters |
| C. | Coagulation tank |
| D. | Sand filter |
| Answer» C. Coagulation tank | |
| 20. |
Grit chamber is constructed to protect the further mechanical equipment of the water treatment plant. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 21. |
At what velocity will the particles settle down? |
| A. | 0.5 m/s |
| B. | 0.3 m/s |
| C. | 0.1 m/s |
| D. | 0.25 m/s |
| Answer» C. 0.1 m/s | |
| 22. |
A grit chamber is usually installed ______ primary sedimentation tanks. |
| A. | Before |
| B. | After |
| C. | In between |
| D. | In |
| Answer» B. After | |
| 23. |
In aerated grit chambers, there are no moving parts below the water surface. |
| A. | True |
| B. | False |
| Answer» B. False | |