A. 25 to 50 m
B. 50 m to 100 m
C. 100 m to 150 m
D. 150 m to 300 m
A. Vs = 418 (Gs – Gw) d [(3T + 70)/100]
B. Vs = 418 (Gs – Gw)d² [(3T + 70)/100]
C. Vs = 218 (Gs – Gw)d² [(3T + 70)/100]
D. Vs = 218 (Gs – Gw)d [(3T + 70)/100]
A. Aeration is continued till stability
B. Aeration is done with an admixture of previously aerated sludge
C. Sludge is activated by constant stirring
D. Water is removed by centrifugal action
A. d/D = ½ (1 – –
B. a/A
C. r/R = [1 –
D. All the above
A. 1.39 m
B. 1.49 m
C. 1.59 m
D. 1.69 m
A. With beds of rocks and gravels
B. Lined with stones
C. Both A. and B.
D. Neither A. nor B.
A. 2 days
B. 7 days
C. 12 days
D. 14 days
A. 30 to 40%
B. 40 to 60%
C. 60 to 80%
D. 80 to 90%
A. 10 days
B. 20 days
C. 30 days
D. 60 days
A. 10 cm
B. 15 cm
C. 20 cm
D. All the above