Category: Waste Water Engineering

A. Maximum daily flow = 2 times the average daily flow
B. Maximum daily flow = average daily flow
C. Sewers are designed for minimum permissible velocity at minimum flow
D. All the above

A. Bend
B. Junction
C. Change of gradient
D. All the above

A. Septic tanks are horizontal continuous flow type of sedimentation tanks
B. Septic tanks are generally provided a detention period of 12 to 36 hours
C. Septic tanks are completely covered and high vent shafts are provided for the escape of foul gases
D. None of these

A. Branch sewers
B. Main sewers
C. Trunk sewers
D. All the above

A. Less than 150
B. Between 150 to 200
C. Between 200 to 300
D. More than 500

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.