Civil Engineering - Waste Water Engineering

46. 

The underground sewers are more subjected to

A. tensile force
B. compressive force
C. bending force
D. shearing force.

Answer: Option B

Explanation:

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47. 

Pick up the correct statement from the following :

A. the sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
B. the sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge
C. the minimum design velocity of sewer pipes is taken as 0.8 m/sec
D. all the above.

Answer: Option D

Explanation:

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48. 

The sewer pipes

A. carry sewage as gravity conduits
B. are designed for generating self-cleansing velocities at different discharge
C. should resist the wear and tear caused due to abrasion
D. all the above.

Answer: Option D

Explanation:

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49. 

The normal values of over flow rates for secondary sedimentation tanks, ranges between

A. 25, 000 to 35, 000 litres/sqm/day
B. 40, 000 to 50, 000 litres/sqm/day
C. 50, 000 to 60, 000 litres/sqm/day
D. 80, 000 to 10, 000 litres/sqm/day
E. none of these.

Answer: Option A

Explanation:

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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

A. 10
B. 15
C. 20
D. 25

Answer: Option C

Explanation:

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