461.
The soft, loose and slimy precipitate formed within the boiler is called
A
Scale
B
sludge
C
embrittlement
D
coagulation
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The soft, loose and slimy precipitate formed within the boiler is called
Scale
sludge
embrittlement
coagulation
The purification of brackish water y reverse osmosis is also called as
Super – filtration
Supra – filtration
Hypo – filtration
filtration
The process of wet steam formation is called
Foaming
priming
corrosion
caustic embrittlement.
The process of allowing water to stand undisturbed in big tanks for settling of the suspended particles due to force of gravity
Coagulation
conditioning
sedimentation
screening
The method by which ions are pulled out of salt water by direct current, and employing thin and rigid membrane is called
Electrodialysis
reverse osmosis
Zeolite
ion exchange
The maximum desirable limits (as per BIS) of total hardness (as ) in drinking water is
600 ppm
300 ppm
500 ppm
1000 ppm
The ion – exchange resins used for softening water are
Cross linked polymers with micro porous structure
Branched polymers with porous structure
Cross linked polymers with non-porous structure
Branched polymers with non – porous structure
The hardness of water sample is 10 ppm, which can be expressed as.............degree Clarke.
0.3
0.4
0.5
0.7
The hardness of water in equivalents containing (Mol. Wt = 120) with concentration of 12 mg/ L is
100 mg/L
10 mg/L
5 mg/L
1 mg/L
The formula of chloramine is
The external treatment of boiler feed water is done by
Lime – soda process
sodium sulphate treatment
Calgon process
sodium aluminate treatment.
The common methods used for disinfection in waste water treatment plants are
Chlorination
UV light
Both a & b
Phenolic solvent
Temporary hardness of water is caused by the presence of
Chlorides of calcium and magnesium
Sulfates of calcium and magnesium
Bicarbonates of calcium and magnesium
Carbonates of calcium and magnesium.
Temporary hardness in water is removed by
Filtration
Sedimentation
Boiling
coagulation.
Solubility of calcium sulphate in water is
Increase with rise of temperature
Decreases with rise of temperature
Remains unaltered with rise of temperature
Does not adopt any definite pattern with rise of temperature.
Permanent hardness in water is caused by the presence of
Bicarbonates of calcium and magnesium
Carbonates of sodium and potassium
Chlorides of sulfates and calcium and magnesium
Phosphates of sodium and potassium
One part of equivalent hardness per 105 parts of water is called
Degree Clarke
ppm
degree French
mg /L
One of the following is an example for cation exchanging resin
Copolymer of phenol formaldehyde – amine formaldehyde
Copolymer of styrene – divinyl benzene
Copolymer of phenol formaldehyde and styrene
Copolymer of amine formaldehyde and divinely benzene
Liquid chlorine is a most effective
Disinfectant
coagulant
floculant
sterilizing agent
Hardness of water is measured in
Degree Clarke
ppm
degree French
mg /L