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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