The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is___________________?

Related Mcqs:

1. For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed__________________?

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

2. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?

   A. 1.5
   B. 2.0
   C. 3.0
   D. 4.0

3. 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

4. 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

5. The ratio of minimum hourly flow to the average flow of sewage is_________________?

   A. 1/4
   B. 1/3
   C. 1/2
   D. 3/4

6. 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

7. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?

   A. 100 cm
   B. 110 cm
   C. 120 cm
   D. 150 cm

8. When drainage to sewage ratio is 20, the peak dry weather flow is_______________?

   A. 20% of the design discharge
   B. Slightly less than 5% of the design discharge
   C. Slightly more than 5% of the design discharge
   D. None of these

9. 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

10. 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