1.
One of the following chemical acts as both coagulant and softening agent
A
Lime
B
soda
C
alum
D
sodium aluminate
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One of the following chemical acts as both coagulant and softening agent
Lime
soda
alum
sodium aluminate
Zeolite used in zeolite softening process for the treatment of hard water gets exhausted after certain time of usage but can be regenerated by flushing it with
10% calcium chloride solution
10% Magnesium Chloride solution
10% Magnesium sulphate solution
10% sodium chloride solution
Zeolite softening process removes
Only temporary hardness of water
Only permanent hardness of water
Both temporary and permanent hardness of water
The dissolved gases in permanent hard water.
Which of the following substances are commonly used in a filter?
Charcoal
Sand
both a & b
Aluminium Chloride
Which of the following salts cause least hardness to water when converted to equivalents?
10 mg of
19 mg of
10 mg of
10 mg of
Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
Chlorination
Treating with Potassium permanganate
UV radiation
Treating with Bleaching powder
Which of the following methods separates ionic and non – ionic impurities from water?
Electrodialysis
deionization
reverse osmosis
zeolite process
Which of the following chemical is sometimes added in the process of coagulation and flocculation.
Aluminum sulphate
Aluminium oxide
Calcium chloride
none of these
When temporary hard water is boiled, one of the substance formed is
Uneven deposition of turbines causes
Vibrational problems
Heat problems
Power problems
Uncontrolled cooling.
Ultraviolet rays are used in the treatment of water for
Filtration
Sedimentation
Screening
Sterilization.
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