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Environmental Engineering
Environmental Engineering Multiple Choice
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Q.1
The minimum detention period of combined aerator is ___________
a) 1 hour
b) 2 hours
c) 3 hours
d) 4 hours
Q.2
The device used for the aeration in the combined aerator is ___________
a) Header pipe
b) Diffuser plate and paddles
c) Cone with spiral vanes
d) Diffuser plate
Q.3
The detention period of the Sheffield mechanical aeration tank is ___________
a) 15 hours
b) 1minute
c) 1 hour
d) 4 hours
Q.4
The speed at which the bubbles are formed in the simplex aerator?
a) 15rpm
b) 20rpm
c) 60rpm
d) 30rpm
Q.5
Dorroco aerator is a type of ___________
a) Combined aerator
b) Mechanical aerator
c) Ridge and furrow type aerator
d) Spiral flow type aerator
Q.6
Simplex aerator is a type of ___________
a) Combined aerator
b) Mechanical aerator
c) Ridge and furrow type aerator
d) Spiral flow type aerator
Q.7
Which gas is produced in aerobic digestion of sludge?
a) NO2
b) CO2
c) O2
d) H2S
Q.8
Which of the following process is not involved in the treatment of sludge?
a) Dewatering
b) Drying
c) Flocculation
d) Conditioning
Q.9
Which of the following is the final stage in the sludge treatment process?
a) Digestion
b) Dewatering
c) Drying
d) Thickening
Q.10
In which sludge treatment process, the organic solids are converted into more stable form?
a) Dewatering
b) Thickening
c) Digestion
d) Conditioning
Q.11
The sludge treatment process to increase the solid content of sludge is ___________
a) Dewatering
b) Thickening
c) Conditioning
d) Drying
Q.12
The process of removal of water from the sludge is called ______
a) Dewatering
b) Thickening
c) Digestion
d) Drying
Q.13
In which sludge treatment process, the sludge is treated with chemicals?
a) Dewatering
b) Thickening
c) Conditioning
d) Drying
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