Waste Water Engineering MCQ Part 2- Environmental Engineering MCQ

Waste Water Engineering MCQ Part 2- Environmental Engineering MCQ Questions

Question No. 1
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

Question No. 2
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

Question No.3
The coagulant which is generally not used for treating the sewage, is
(A) Alum
(B) Ferric chloride
(C) Ferric sulphate
(D) Chlorinated copperas

Question No. 4
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

Question No. 5
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

Question No. 6
The gas which may cause explosion in sewers, is
(A) Carbondioxide
(B) Methane
(C) Ammonia
(D) Carbon monoxide

Question No. 7
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

Question No. 8
Pick up the incorrect statement from the following:
(A) The process of decomposing the organic matter under controlled anaerobic conditions, is called sludge digestion
(B) Sludge digestion is carried out in sludge tank
(C) The gases produced in sludge digestion process, contain 75% carbon dioxide
(D) The gases produced in sludge digestion process, contain 75% methane

Question No. 9
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

Question No. 10
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

Waste Water Engineering MCQ Part 2- Environmental Engineering MCQ

Question No 1:   D

Question No 2:   D

Question No 3:   A

Question No 4:  D

Question No 5:  C

Question No 6:  B

Question No 7:  A

Question No 8:  C

Question No 9:  D

Question No 10: D

Read More: Waste Water Engineering MCQ Part 1

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