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Waste Water Engineering
Advanced Waste Water Engineering
Quiz 1
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Q.1
If the water is brown in colour it indicates the presence of which of these?
a) Iron
b) Manganese
c) Arsenic
d) Barium
Q.2
How is Iron removed?
a) Oxidation
b) Clarifier
c) HRSCC
d) Ultrafiltration
Q.3
What is the safe limit for iron in the water?
a) 0.3 ppm
b) 0.5 ppm
c) 5 ppm
d) 1 ppm
Q.4
What is the safe limit for manganese in water?
a) 0.05
b) 0.15
c) 0.2
d) 0.25
Q.5
What is the method used to delay the precipitation of oxidized manganese and iron?
a) Addition of phosphate
b) Addition of nitrate
c) Addition of hydrogen
d) Addition of chloride
Q.6
What is the concentration of dissolved oxygen required to oxidize 1 ppm of iron?
a) 0.14 ppm
b) 0.12 ppm
c) 0.15 ppm
d) 0.20 ppm
Q.7
What is the concentration of dissolved oxygen required to oxidize 1 ppm of manganese?
a) 0.2 ppm
b) 0.23 ppm
c) 0.30 ppm
d) 0.27 ppm
Q.8
Which of these methods is not used for the removal of arsenic?
a) Activated alumina
b) Green sand
c) Coagulation by Iron hydroxide
d) Activated carbon
Q.9
Considering the total cost which of these is the most expensive method to remove arsenic?
a) Green sand
b) Activated alumina
c) Coagulation by Iron hydroxide
d) Tehonoarz method
Q.10
Which of these is the most efficient method to remove arsenic?
a) Green sand
b) Tehonoarz
c) Coagulation by Iron hydroxide
d) Activated alumina
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