Civil Engineering MCQs

Page No. 172

The hydraulic mean depth (HMD. for an egg-shaped sewer flowing two-third full is_______________?


a equal to HMD when flowing full


b less than HMD when flowing full


c greater than HMD when flowing full


dnone of the above



Sewerage system is usually designed for_________________?


a10 years


b 25 years


c50 years


d75 years


View Answer 25 years

The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is_________________?


a separate system


bcombined system


cpartially separate system


dpartially combined system


View Answer combined system

If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be__________________?


a4 mm/hr


blOmm/hr


c20 mm/hr


d40 mm/hr


View Answer 40 mm/hr

The specific gravity of sewage is_______________?


amuch greater than 1


b slightly less than 1


cequal to 1


dslightly greater than 1



The slope of sewer shall be__________________?


a given in the direction of natural slope of ground


bgiven in the direction opposite to natural slope of ground


czero


dsteeper than 1 in 20



The design discharge for the combined sewer system shall be taken as________________?


aequal to rainfall


b rainfall + DWF


crainfall + 2 DWF


drainfall + 6 DWF


View Answer rainfall + 2 DWF

The main disadvantage of cement concrete sewers is________________?


aless strength


b difficulty in construction


cdifficulty in transportation due to heavy weight


dless life



An egg shaped section of sewer________________?


a is economical than circular section


b provides self cleansing velocity at low discharges


c is more stable than circular section


d is easy to construct



The most commonly used sewer under culverts is_______________?


acircular brick sewer


b circular cast iron sewer


c semi-elliptical sewer


d horse-shoe type sewer


View Answer circular brick sewer

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