WASTEWATER ENGINEERING MCQ Civil Engineering
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11. Acid regression stage of sludge digestion at a temperature 21°C extends over a period of
(A) 15 days
(B) 30 days
(C) 60 days
(D) 90 days
Answer:(D)
(A) 15 days
(B) 30 days
(C) 60 days
(D) 90 days
Answer:(D)
12. Pick up the correct statement from the following:
(A) Small sewers are cleaned by flushing
(B) Medium sewers are cleaned by cane rodding
(C) Medium sewers may be cleaned by pills
(D) All the above
Answer:(D)
13. The coagulant which is generally not used for treating the sewage, is
(A) Alum
(B) Ferric chloride
(C) Ferric sulphate
(D) Chlorinated coppers
Answer:(A)
14. The layers of vegetable wastes and night soil alternatively piled above the ground to form a
mound, is called
(A) A heap
(B) Plateau
(C) Windrow
(D) None of these
Answer:(D)
15. If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the
sewer certainly contains
(A) Hydrogen sulphide
(B) Carbon dioxide
(C) Methane
(D) Oxygen
Answer:(D)
16. The gas which may cause explosion in sewers, is
(A) Carbondioxide
(B) Methane
(C) Ammonia
(D) Carbon monoxide
Answer:(B)
17. Pick up the correct statement from the following:
(A) The water supply pipes carry pure water free from solid particles
(B) The water supply pipes get clogged if flow velocity is less than self cleansing velocity
(C) The sewers may be carried up and down the hills and valleys
(D) The sewer pipes are generally laid along level hills
Answer:(A)
18. The sewer pipes
(A) Carry sewage as gravity conduits
(B) Are designed for generating self-cleansing velocities at different discharge
(C) Should resist the wear and tear caused due to abrasion
(D) All the above
Answer:(D)
19. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m
per sec. The detention period recommended for the tank, is
(A) 30 minutes
(B) 1 hour
(C) 1 hour and 30 minutes
(D) 2 hours
Answer:(D)
20. The Chezy's constant C in the formula V = C √rs depends upon
(A) Size of the sewer
(B) Shape of the sewer
(C) Roughness of sewer surface
(D) All the above
Answer:(D)
Part 3 click here to attempt
(A) Small sewers are cleaned by flushing
(B) Medium sewers are cleaned by cane rodding
(C) Medium sewers may be cleaned by pills
(D) All the above
Answer:(D)
13. The coagulant which is generally not used for treating the sewage, is
(A) Alum
(B) Ferric chloride
(C) Ferric sulphate
(D) Chlorinated coppers
Answer:(A)
14. The layers of vegetable wastes and night soil alternatively piled above the ground to form a
mound, is called
(A) A heap
(B) Plateau
(C) Windrow
(D) None of these
Answer:(D)
15. If the flame of a miner's safety lamp in the upper layers of the sewer forms an explosive, the
sewer certainly contains
(A) Hydrogen sulphide
(B) Carbon dioxide
(C) Methane
(D) Oxygen
Answer:(D)
16. The gas which may cause explosion in sewers, is
(A) Carbondioxide
(B) Methane
(C) Ammonia
(D) Carbon monoxide
Answer:(B)
17. Pick up the correct statement from the following:
(A) The water supply pipes carry pure water free from solid particles
(B) The water supply pipes get clogged if flow velocity is less than self cleansing velocity
(C) The sewers may be carried up and down the hills and valleys
(D) The sewer pipes are generally laid along level hills
Answer:(A)
18. The sewer pipes
(A) Carry sewage as gravity conduits
(B) Are designed for generating self-cleansing velocities at different discharge
(C) Should resist the wear and tear caused due to abrasion
(D) All the above
Answer:(D)
19. The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m
per sec. The detention period recommended for the tank, is
(A) 30 minutes
(B) 1 hour
(C) 1 hour and 30 minutes
(D) 2 hours
Answer:(D)
20. The Chezy's constant C in the formula V = C √rs depends upon
(A) Size of the sewer
(B) Shape of the sewer
(C) Roughness of sewer surface
(D) All the above
Answer:(D)
Part 3 click here to attempt
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