WASTE WATER ENGINEERING

Q: Self-cleansing velocity is

(a) :  velocity at dry weather flow
(b) :  velocity of water at flushing
(c) :  velocity at which no accumulation remains in the drains
(d) :  velocity of water in a pressure filter.
(e) :  None of these
Answer:  velocity at which no accumulation remains in the drains
Explanation:  

Q: PH value of sludge during alkaline regression stage, is

(a) :  more than 7
(b) :  less than 7
(c) :  less than 6
(d) :  more than 6
(e) :  None of these
Answer:  more than 7
Explanation:  

Q: The gas which may cause explosion in sewers, is

(a) :  carbondioxide
(b) :  methane
(c) :  ammonia
(d) :  carbon monoxide.
(e) :  None of these
Answer:  methane
Explanation:  

Q: The grit and silt of the grit chambers, may not be used for

(a) :  raising low lying areas by dumping
(b) :  concreting
(c) :  both (a) and (b)
(d) :  neither (a) nor (b)
(e) :  None of these
Answer:  concreting
Explanation:  

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