In Chezy’s formula V = C rs for calculating the velocity of flow in circular sewer of diameter running full, the value of hydraulic mean radius is_______________?

Related Mcqs:

1. 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

2. 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

3. If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is_______________?

   A. D’ = 0.64 D
   B. D’ = 0.74 D
   C. D’ = 0.84 D
   D. D’ = 0.94 D

4. If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is__________________?

   A. 1.39 m
   B. 1.49 m
   C. 1.59 m
   D. 1.69 m

5. running partially full with central angle , For a circular sewer of diameter__________________?

   A. d/D = ½ (1 – –
   B. a/A
   C. r/R = [1 –
   D. All the above

6. 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

7. Hydraulic mean radius is_______________?

   A. Mean radius of sewer
   B. Difference in heads between two points in circular pipes
   C. Mean of radii in a pipe line of varying cross -sections
   D. Cross-sectional area/wetted perimeter

8. If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is______________?

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

9. If is the rugosity coefficient, is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = (1/n) r2/3 s1/2 evolved by_________________?

   A. Chezy
   B. Manning
   C. Bazin
   D. Kutter

10. The Chezy’s constant C in the formula V = C_________________?

    A. Size of the sewer
    B. Shape of the sewer
    C. Roughness of sewer surface
    D. All the above