Civil Engineering - Waste Water Engineering
Exercise :: Waste Water Engineering - Section 2
| 1. |
The most dangerous pollutant in vehicular emissions is |
Answer: Option A
Explanation:
|
| 2. |
If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is |
| A. |
50 mg/l | | B. |
100 mg/l | | C. |
150 mg/l | | D. |
200 mg/l | | E. |
250 mg/l. |
Answer: Option E
Explanation:
|
| 3. |
The clarigesters are |
| A. |
circular septic tanks | | B. |
rectangular septic tanks | | C. |
circular Imhoff double tanks with bottom hoppers | | D. |
circular Imhoff double storey tanks without bottom hoppers. |
Answer: Option D
Explanation:
|
| 4. |
Rate of flow of sewage is generally assumed |
| A. |
more than the rate of water supply | | B. |
equal to the rate of water supply | | C. |
less than the rate of water supply | | D. |
at 150 litres per capita. |
Answer: Option C
Explanation:
|
| 5. |
Maximum permissible velocity 1.5 m/sec, is adopted in drains |
| A. |
with beds of rocks and gravels | | B. |
lined with stones | | C. |
both (a) and (b) | | D. |
neither (a) nor (b). |
Answer: Option C
Explanation:
|
