The coagulant widely used for sewage treatment, is alum ferric chloride ferric s

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Question
The coagulant widely used for sewage treatment, is
Options
A. alum
B. ferric chloride
C. ferric sulphate
D. chlorinated copperas.

Correct Answer

ferric chloride

Waste Water Engineering problems

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2. The phenomenon occuring in an open channel when a rapidly flowing stream abruptly changes to a slowly flowing stream causing a distinct rise of liquid surface, is
Options
A. water hammer
B. hydraulic jump
C. critical discharge
D. none of these.

4. The property of steam function ? is :
Options
A. ? is constant everwhere on any stream line
B. the flow around any path in the fluid is zero for continuous flow
C. the rate of change of ? with distance in an arbitrary direction, is proportional to the component of velocity normal to that direction
D. the velocity vector may be found by differentiating the stream function
E. all the above.

5. Differential manometers are used to measure
Options
A. pressure in water channels, pipes, etc.
B. difference in pressure at two points
C. atmospheric pressure
D. very low pressure.

7. Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.

Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.
Options
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true.

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