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
0 h : 0 m : 1 s