The sewer which transports the sewage to the point of treatment, is called________________?

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 sewer that unloads the sewage at the point of treatment is called_________________?

   A. Main sewer
   B. Outfall sewer
   C. Branch sewer
   D. House sewer

3. The sewage treatment units in which anaerobic decomposition of organic matter is used, are called________________?

   A. Imhoff tanks
   B. Trickling filters
   C. Sludge sedimentation tanks
   D. None of these

4. If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains_______________?

   A. Hydrogen sulphide
   B. Carbon dioxide
   C. Methane
   D. Oxygen

5. The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer may be__________________?

   A. 0.9 cm
   B. 1.2 m
   C. 1.5 m
   D. > 1.5 m

6. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is________________________?

   A. 20 cm
   B. 25 cm
   C. 40 cm
   D. 50 cm

7. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is______________?

   A. 0.68 m
   B. 0.88 m
   C. 1.36 m
   D. 1.76 m

8. Assertion A.: The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R): If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer?

   A. Both A and R are true and R is the correct explanation of A
   B. Both A and R are true but R is not a correct explanation of A
   C. A is true but R is false
   D. A is false but R is true

9. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?

   A. Full depth
   B. Half full
   C. Two third full
   D. Three fourth full

10. weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?

    A. w r S S
    B. w r1/2
    C. w r S
    D. w r2/3