Category: Waste Water Engineering

A. Carbon dioxide
B. Nitrates
C. Sulphates
D. All the above

A. Rate of digestion of sludge is more at higher temperature
B. Thermophilic organisms digest the sludge if the temperature ranges from 40° to 60°C
C. Mesophilic organisms digest the sludge if the temperature is between 25° and 40°C
D. All the above

A. From low lying areas
B. From flat areas
C. From basements
D. All the above

A. House sewer
B. Out-fall sewer
C. Branch sewer
D. Main sewer

A. Minimum velocity of 0.45 m/sec, is maintained at its minimum flow
B. A maximum velocity of 0.90 m/sec, is maintained at its maximum flow
C. Both A. and B.
D. Neither A. nor B.

A. Chezy’s formula
B. Bazin’s formula
C. Kutter’s formula
D. Manning’s formula

A. The materials separated by screens, is called screenings
B. The screenings are disposed off either by burning or by burial or by dumping
C. The process of burning the screenings, is known as compositing
D. All the above

A. The mixture of water and waste products, is called sewage
B. The treated sewage effluents, are generally used for irrigating the crops
C. The process of collecting, treating and disposing off the sewage, is called sewerage
D. The old convergence system was definitely better than water carried sewerage system

A. Invert level of a branch sewer is more than 60 cm that of the main sewer
B. Sewer line runs along a main road
C. Ordinary manhole cannot be built
D. Two sewer lines intersect

A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm