🏗️Civil Engineering MCQs
Civil Engineering MCQs
479 MCQs131
The small sewers are cleaned by____________________?
AFlushing
BCane rodding
CWooden pills
DNone of these
132
In sewers the gas generally found, is_________________?
AHydrogen sulphide (H2S)
BCarbon dioxide (CO2)
CMethane (CH4)
DAll the above
133
The ratio of minimum hourly flow to the average flow of sewage is_________________?
A1/4
B1/3
C1/2
D3/4
134
Removal of oil and grease from sewage, is known____________________?
AScreening
BSkimming
CFiltration
DNone of these
135
The gradient of sewers depends upon_________________?
AVelocity of flow
BDiameter of the sewer
CDischarge
DAll the above
136
The standard B.O.D. of water is taken for_________________?
A1 day
B2 days
C3 days
D5 days
137
Fresh sewage may become stale in_________________?
AOne hour
BTwo to three hours
CThree to four hours
DSix hours
138
The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?
A100 cm
B110 cm
C120 cm
D150 cm
139
Drop manholes at the junctions of sewer lines, are provided if________________?
AInvert level of a branch sewer is more than 60 cm that of the main sewer
BSewer line runs along a main road
COrdinary manhole cannot be built
DTwo sewer lines intersect
140
During purification process of sewage the gas given off, is________________?
ACarbon dioxide
BHydrogen
CAmmonia
DAll the above