# Civil Engineering - Waste Water Engineering

Exercise : Waste Water Engineering - Section 6
46.
The underground sewers are more subjected to
tensile force
compressive force
bending force
shearing force.
Explanation:
No answer description is available. Let's discuss.

47.
Pick up the correct statement from the following :
the sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
the sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge
the minimum design velocity of sewer pipes is taken as 0.8 m/sec
all the above.
Explanation:
No answer description is available. Let's discuss.

48.
The sewer pipes
carry sewage as gravity conduits
are designed for generating self-cleansing velocities at different discharge
should resist the wear and tear caused due to abrasion
all the above.
Explanation:
No answer description is available. Let's discuss.

49.
The normal values of over flow rates for secondary sedimentation tanks, ranges between
25, 000 to 35, 000 litres/sqm/day
40, 000 to 50, 000 litres/sqm/day
50, 000 to 60, 000 litres/sqm/day
80, 000 to 10, 000 litres/sqm/day
none of these.
Explanation:
No answer description is available. Let's discuss.

50.
The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is
10
15
20
25