MCQOPTIONS
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MCQOPTIONS
This section includes 8 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. |
The sludge in water softening accelerator is deposited at ____________ |
| A. | Sedimentation tank |
| B. | Reaction zone |
| C. | Concentrator |
| D. | Secondary mixing zone |
| Answer» D. Secondary mixing zone | |
| 2. |
The minimum reaction time allowed in the recarbonation basin is ____________ |
| A. | 5minutes |
| B. | 10minutes |
| C. | 15minutes |
| D. | 20minutes |
| Answer» E. | |
| 3. |
The detention period of a lime soda treatment plant is ____________ |
| A. | 1hour |
| B. | 3hours |
| C. | 2-4hours |
| D. | 4-7hours |
| Answer» D. 4-7hours | |
| 4. |
Softening chemicals, lime and soda do not depend on ____________ |
| A. | Free carbon dioxide present |
| B. | Non carbonate hardness |
| C. | Total magnesium |
| D. | Carbonate hardness |
| Answer» E. | |
| 5. |
Which chemical is used for removing the permanent hardness of Calcium chloride? |
| A. | Lime |
| B. | Chlorine |
| C. | Soda |
| D. | Both lime and soda |
| Answer» C. Soda | |
| 6. |
The temperature at which the softening of water takes place by lime soda process is ____________ |
| A. | 10<sup>o</sup>-21<sup>o</sup>C |
| B. | 20<sup>o</sup>-30<sup>o</sup>C |
| C. | 39<sup>o</sup>-45<sup>o</sup>C |
| D. | 90<sup>o</sup>C |
| Answer» B. 20<sup>o</sup>-30<sup>o</sup>C | |
| 7. |
The time required for the mixing of lime and soda in lime soda process is _____________ |
| A. | 10min |
| B. | 20min |
| C. | 40min |
| D. | 80 min |
| Answer» D. 80 min | |
| 8. |
The permanent hardness can be removed by adding lime and soda. |
| A. | True |
| B. | False |
| Answer» B. False | |