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
Related Mcqs:
- 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_______________?
A. D
B. D /2
C. D/3
D. D/4 - 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 - The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called ____________________?
A. Inverted syphon
B. Depressed sewer
C. Sag pipe
D. all of these - A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc__________________?
A. 10 kg
B. 100 kg
C. 1000 kg
D. 1 kg
E. 10,000 kg - In normal conditions, the period for sludge digestion, is_______________?
A. 10 days
B. 20 days
C. 30 days
D. 60 days - 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 - 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 - 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 - The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is_______________?
A. 25 %
B. 50 %
C. 10 %
D. 5 % - In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?
A. Separate system
B. Combined system
C. Partially combined system
D. None of these
