1) settling tank
2) digestion tank
3) aeration tank
The correct answer is?
A. only (1)
B. (1) and (2)
C. (1) and (3)
D. only (3)
Related Mcqs:
- The characteristics of fresh and septic sewage respectively are____________________?
A. acidic and alkaline
B. alkaline and acidic
C. both acidic
D. both alkaline - The length of rectangular sedimentation tank should not be more than_______________?
A. B
B. 2B
C. 4B
D. 8Bwhere B is the width of the tank
- The settling velocity of a particle in a sedimentation tank increases if______________?
A. particle size is decreased
B. the surface area of tank is increased
C. the depth of tank is decreased
D. none of the above - The gas from sludge digestion tank is mainly composed of __________________?
A. nitrogen
B. carbon dioxide
C. hydrogen sulphide
D. methane - For a given discharge, the efficiency of sedimentation tank can be increased by______________?
A. increasing the depth of tank
B. decreasing the depth of tank
C. increasing the surface area of tank
D. decreasing the surface area of tank - The settling velocity of a particle in a sedimentation tank depends on__________________?
A. depth of tank
B. surface area of tank
C. both depth and surface area of tank
D. none of the above - The settling velocity of a particle in a sedimentation tank increases if_________________?
A. particle size is decreased
B. the surface area of tank is increased
C. the depth of tank is decreased
D. none of the above - The velocity of flow of water in a sedimentation tank is about__________________?
A. 5 to 10 cm/sec.
B. 15 to 30 cm/sec.
C. 15 to 30 cm/minute
D. 15 to 30 cm/hour - The maximum permissible limit for flouride in drinking water is______________?
A. 0.1 mg/litre
B. 1.5 mg/litre
C. 5 mg/litre
D. 10 mg/litre - The water carriage system of collection of waste product________________?
A. is cheaper in initial cost than dry conservancy system
B. requires treatment before disposal
C. creates hygenic problem
D. all of the above
