Related Questions

The amount of chemical coagulant added for treatment of polluted water __________ with increase in temperature of the polluted water to be treated.
A Decreases
B Increases
C Remains constant
D May increase or decrease ; depends on the chemical characteristics of polluted water
The most commonly used chemical coagulant in water treatment is
A Ferrous sulphate
B Alum
C Lime
D Hydrazine
The coagulant which is generally not used for treating the sewage, is
A Alum
B Ferric chloride
C Ferric sulphate
D Chlorinated coppers
Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?
A Ammonium alum
B Potassium alum
C Both A & B
D Neither A nor B
Which of the following is used as a coagulant in water treatment?
A Chloramine
B Chlorine
C Ferrous sulphate
D Hydrogen peroxide
Which of the following is used as a coagulant in treating turbid water?
A Chlorine
B Ferric sulphate
C Calcium sulphate
D Activated carbon
Which is the most widely used coagulant for the treatment of turbid water?
A Alum (aluminium sulphate)
B Lime
C Ferric chloride
D Sodium aluminate
The alum, when added as a coagulant in water
A Does not require alkalinity in water for flocculation
B Does not affect pH value of water
C Increases pH value of water
D Decreases pH value of water
Alum as a coagulant is found to be most effective when pH range of water is
A 2 to 4
B 4 to 6
C 6 to 8
D 8 to 10
The normal values of over flow rates for sedimentation tanks using coagulant, ranges between
A 25,000 to 35,000 litres/sqm/day
B 40,000 to 50,000 litres/sqm/day
C 50,000 to 60,000 litres/sqm/day
D 80,000 to 100,000 litres/sqm/day

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