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
✅ The correct answer is option D.
Civil Engineering
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672. Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for__________________?
A. Unexpected large scale infiltration of stream water
B. Unexpected increase in the population
C. Under estimates of maximum and average flows
D. All of the above
✅ The correct answer is option D.
673. Gradually varied flow is____________________?
A. steady uniform
B. non-steady non-uniform
C. non-steady uniform
D. steady non-uniform
✅ The correct answer is option D.
674. In very first stage of decomposition of the organic matter in sewage________________?
A. Nitrites are formed
B. Nitrates are formed
C. Carbondioxide is formed
D. Ammonia is formed
✅ The correct answer is option D.
675. Practical fluids____________________?
A. are viscous
B. possess surface tension
C. are compressible
D. possess all the above properties
✅ The correct answer is option D.
676. Kjeldahl nitrogen is a mixture of___________________?
A. Ammonia and nitrogen
B. Nitrogen and organic nitrogen
C. Organic nitrogen and ammonia
D. All the above
✅ The correct answer is option D.
677. An ideal flow of any fluid must fulfill the following______________?
A. Newton’s law of motion
B. Newton’s law of viscosity
C. Pascal’ law
D. Continuity equation
✅ The correct answer is option D.
678. 1000 kg of sewage contains________________?
A. 0.112 kg in suspension
B. 0.112 kg in solution
C. 0.225 kg in solution
D. Both A. and C. of above
✅ The correct answer is option D.
679. In detritus tanks______________________?
A. Flow velocity is kept 0.09 m/sec
B. Detention period is kept 3 to 4 minutes
C. Organic and inorganic materials are separated
D. All the above
✅ The correct answer is option D.
680. The settlement of a particle in sedimentation tank, is affected by_____________________?
A. Velocity of flow
B. Viscosity of water
C. Size and shape of solid
D. All the above
✅ The correct answer is option D.