Civil Engineering MCQs

Page No. 174

Septic tank is a______________?


asettling tank


bdigestion tank


caeration tank


dA and B


View Answer A and B

Generally the detention period for grit chambers is kept as_______________?


a1 minute


b5 minutes


c 2-4 hours


d 12 hours


View Answer 1 minute

The working conditions in imhoff tanks are_______________?


aaerobic only


banaerobic only


caerobic in lower compartment and anaerobic in upper compartment


d anaerobic in lower compartment and aerobic in upper compartment



The detention period for oxidation ponds is usually kept as______________?


a4-8 hours


b24 hours


c10 to 15 days


d 3 months


View Answer 10 to 15 days

The main disadvantage of oxidation pond is that________________?


alarge area is required for construction


bmaintenance and operation cost are high


cOBOD removal is very low


dnone of the above



Sludge volume index is defined as the ratio of_______________?


a percentage of sludge by volume to percentage of suspended solids by weight


bpercentage of sludge by volume to percentage of total solids by weight


cpercentage of suspended solids by weight to percentage of sludge by volume


dpercentage of total solids by weight to percentage of sludge by volume



When there is no recirculation of sewage, then recirculation factor is_______________?


a 0


b1


cinfinity


dnone of the above


View Answer 1

The pipe which is used to carry the discharge from sanitary fittings like bath rooms, kitchens etc. is called_______________?


awaste pipe


bsoil pipe


cvent pipe


dantisiphonage pipe


View Answer waste pipe

Most of the bacteria in sewage are______________?


aparasitic


bsaprophytic


cpathogenic


danaerobic


View Answer saprophytic

A pipe which is installed in the house drainage to preserve the water seal of traps is called______________?


avent pipe


bantisiphonage pipe


cwaste pipe


dsoil pipe


View Answer antisiphonage pipe

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