For design of sewers, percentage of sewage discharge is assumed_____________________?

Related Mcqs:

1. The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is_____________________?

   A. 0.05552 cumec
   B. 0.05554 cumec
   C. 0.05556 cumec
   D. 0.0556 cumec

2. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?

   A. 1.5
   B. 2.0
   C. 2.5
   D. 3.0

3. In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is_____________________?

   A. 5
   B. 10
   C. 15
   D. 20

4. In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

   A. 100 mm dia.
   B. 150 mm dia.
   C. 225 mm dia.
   D. All of these

5. The sewer which received discharge from two or more main sewers, is known as_______________?

   A. A trunk sewer
   B. An outfall sewer
   C. A main sewer
   D. An intercepting sewer

6. Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is ?

   A. Centrifugal pump
   B. Pneumatic ejector
   C. Reciprocating pump
   D. None of these

7. If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is_________________?

   A. 100 mg/l
   B. 200 mg/l
   C. 300 mg/l
   D. 400 mg/l

8. A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is____________________?

   A. 100
   B. 1000
   C. 5000
   D. 10000

9. 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. 250 mg/l

10. If q is the average sewage flow from a city of population P, the maximum sewage flow______________?

    A. Q = [(4 + )/(18 + )] q
    B. Q = [(18 + P)/(4 + )] q
    C. Q = [(18 + )/(4 + )] q
    D. Q = [(5 + )/((15 + )] q