The small sewers are cleaned by____________________?

Related Mcqs:

1. The grit chambers of sewage treatment plants, are generally cleaned after__________________?

   A. 2 days
   B. 7 days
   C. 12 days
   D. 14 days

2. The asbestos cement sewers are_________________?

   A. Light in weight
   B. Not structurally strong to bear large compressive stress
   C. Susceptible to corrosion by sulphuric acid
   D. All the above

3. Cement concrete sewers are only suitable if non-scouring velocity is between_________________?

   A. 2.5 to 3.0 m/sec
   B. 3.0 to 4.0 m/sec
   C. 3.5 to 4.5 m/sec
   D. 4.5 to 5.5 m/sec

4. Setting out the alignments of sewers may start from__________________?

   A. City
   B. Out-fall
   C. Tail end
   D. Any point

5. The maximum diameter of sewers adopted in the designs is_______________?

   A. 1.0 m
   B. 2.0 m
   C. 3.0 m
   D. 4.0 m

6. 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

7. Large diameter sewers subjected to external pressure alone, are reinforced ______________________?

   A. Near the inner surface of the pipe
   B. Near the outer surface of the pipe
   C. Both A. and B.
   D. With elliptical cage

8. In olden days the type of section adopted in trunk and out fall sewers was__________________?

   A. Parabolic shaped
   B. Horse shoe shaped
   C. Egg shaped
   D. Circular shaped

9. The gradient of sewers depends upon_________________?

   A. Velocity of flow
   B. Diameter of the sewer
   C. Discharge
   D. All the above

10. In sewers the velocity of flow should not be_________________?

    A. More than the self-cleansing velocity
    B. Less than the self-cleansing velocity
    C. Less than 10 m/sec
    D. More than 20 m/sec