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.Management Sciences
Category: Waste Water Engineering
If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains_______________?
0
A. Hydrogen sulphide
B. Carbon dioxide
C. Methane
D. Oxygen
The underground sewers are more subjected to________________?
A. Tensile force
B. Compressive force
C. Bending force
D. Shearing force
In detritus tanks______________________?
A. Flow velocity is kept 0.09 m/sec
B. Detention period is kept 3 to 4 minutes
C. Organic and inorganic materials are separated
D. All the above
Which one of the following tests is used for testing sewer pipes ?
A. Water test
B. Ball test
C. Mirror test
D. All of these
During purification process of sewage the gas given off, is________________?
A. Carbon dioxide
B. Hydrogen
C. Ammonia
D. All the above
The drop man holes are generally provided in sewers for____________________?
A. Industrial areas
B. Large town ships
C. Hilly town ships
D. Cities in plains
With self cleansing velocity in sewers___________________?
A. Silting occurs at bottom
B. Scouring occurs at bottom
C. Both silting and scouring occur at bottom
D. Neither silting nor scouring occurs at bottom
Maximum permissible velocity 1.5 m/sec, is adopted in drains_______________________?
A. With beds of rocks and gravels
B. Lined with stones
C. Both A. and B.
D. Neither A. nor B.
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