An inverted siphon is designed generally for____________________?
A. One pipe
B. Two pipes
C. Three pipes
D. Four pipes
Waste Water Engineering
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter______________________?
Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter______________________?
A. Less than 0.01 mm
B. Less than 0.05 mm
C. Less than 0.1 mm
D. Greater than 0.1 mm
In sewers designed with self cleansing velocity________________?
In sewers designed with self cleansing velocity________________?
A. The bottom is silted
B. The bottom is scoured
C. Both silting and scouring occur at the bottom
D. Neither silting nor scouring occurs at the bottom
The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?
The spacing of bars of perforations of fine screens used for the treatment of sewage, is_______________?
A. 2 to 3 mm
B. 3 to 5 mm
C. 5 to 8 mm
D. 8 to 10 mm
The rate of accumulation of sludge per person per year, is_______________________?
The rate of accumulation of sludge per person per year, is_______________________?
A. 10 litres
B. 15 litres
C. 20 litres
D. 25 litres
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?
In circular sewers if depth of flow is 0.2 times the full depth, the nominal gradient,______________?
A. Is only provided
B. Is doubled
C. Is trebled
D. Is not enough
The flow velocity in detritus tanks is________________?
The flow velocity in detritus tanks is________________?
A. 0.05 m/sec
B. 0.09 m/sec
C. 1.25 m/sec
D. None of these
The water carried sewerage system removes__________________?
The water carried sewerage system removes__________________?
A. Domestic sewage
B. Industrial sewage
C. Storm sewage
D. All the above
The asbestos cement pipes are generally laid___________________?
The asbestos cement pipes are generally laid___________________?
A. Horizontally
B. Vertically
C. At an angle of 30°
D. At an angle of 60°
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of______________?
A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of______________?
A. Carbondioxide gas
B. Hydrogen sulphide gas
C. Methane gas
D. Petrol vapours