Category: Waste Water Engineering

A. Nitrates
B. Nitrites
C. Free ammonia
D. None of these

A. It is cheaper in construction
B. It provides maximum area for a given perimeter
C. It provides maximum hydraulic mean depth
D. All the above

A. The particular manhole and one manhole on upstream and one manhole on downstream should remain open for 30 minutes
B. Proper tests for the presence of poisonous gases must be carried out
C. The men entering the manhole should be advised to smoke in the sewer
D. Warning signals should be erected

A. Q/(B × D)
B. Q/(L × D)
C. Q/L
D. Q/(B × L)

A. Boiling
B. Adding potassium permanganate
C. Adding sulphuric acid
D. Phenol-di-sulphuric acid

A. Circular septic tanks
B. Rectangular septic tanks
C. Circular Imhoff double tanks with bottom hoppers
D. Circular Imhoff double storey tanks without bottom hoppers

A. 2 to 3 mm
B. 3 to 5 mm
C. 5 to 8 mm
D. 8 to 10 mm

A. 100 cm
B. 110 cm
C. 120 cm
D. 150 cm

A. Stone ware pipes
B. Earthenware pipes
C. C.I. pipes
D. G.I. pipes

A. 2 days
B. 7 days
C. 12 days
D. 14 days