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Test: Sewage Treatment - 1 - Civil Engineering (CE) MCQ


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10 Questions MCQ Test GATE Civil Engineering (CE) 2025 Mock Test Series - Test: Sewage Treatment - 1

Test: Sewage Treatment - 1 for Civil Engineering (CE) 2024 is part of GATE Civil Engineering (CE) 2025 Mock Test Series preparation. The Test: Sewage Treatment - 1 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Sewage Treatment - 1 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Sewage Treatment - 1 below.
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Test: Sewage Treatment - 1 - Question 1

During preliminary treatment of sewage

Test: Sewage Treatment - 1 - Question 2

The detention period adopted for grit chambers is of the order of

Detailed Solution for Test: Sewage Treatment - 1 - Question 2

Grit chambers or grit channels or grit basins are used to remove inorganic particles having specific gravity of about 2.65. The detention time is based on the depth of water and settling velocity of inorganic particles. A detention time of about 40 to 60 sec is generally sufficient for a water depth of 1 to 1.8 m.

Test: Sewage Treatment - 1 - Question 3

The detention period adopted for oxidation ponds is of the order of:

Test: Sewage Treatment - 1 - Question 4

The spacing of bars in coarse screens is generally more than

Detailed Solution for Test: Sewage Treatment - 1 - Question 4

Coarse screens: Spacing is 50 mm or more Medium screens: Spacing is 6 to 40 mm.
Fine screens: Spacing is 1.5 to 3 mm

Test: Sewage Treatment - 1 - Question 5

The ratio of flowing through period’ to ‘detention period' in a sedimentation tank, is called.

Test: Sewage Treatment - 1 - Question 6

A grit chamber, having higher detention period (about 3 - 4 times,) is called a

Detailed Solution for Test: Sewage Treatment - 1 - Question 6

Detritus tanks are nothing but grit chambers designed to flow with a smaller flow velocity (of about 0.09 m/sec) and longer detention periods (about 3 to 4 minutes) so as to separate out not only the larger grit, etc., but also to separate out the very fine sand particles.

Test: Sewage Treatment - 1 - Question 7

Trickling filter plants are preferred for sewage treatment for

Test: Sewage Treatment - 1 - Question 8

The working condition in imhoff tanks are

Detailed Solution for Test: Sewage Treatment - 1 - Question 8

The upper chamber is called the sedimentation chamber or flowing through chamber, through which the sewage flows at a very low velocity and the lower chamber is the digestion chamber, in which the sludge gets digested due to anaerobic decomposition.

Test: Sewage Treatment - 1 - Question 9

Chlorine is sometimes used in sewage treatment

Detailed Solution for Test: Sewage Treatment - 1 - Question 9

Bulking of activated sludge is due to the presence of filament micro-organism, e.g. fungi . Chlorination is some times used to destroy such organisms to avoid bulking of activated sludge.

Test: Sewage Treatment - 1 - Question 10

Dissolved organic solids in wastewater treatment may be removed by

Detailed Solution for Test: Sewage Treatment - 1 - Question 10

Coagulation- It can assemble mainly inorganic particle to form large flocs.
Hypochlorination- It is used to kill mainly pathogens,
Reverse Osmosis- A process by which a solvent passes through a porous membrane in the direction opposite to that for natural osmosis when subjected to a hydrostatic pressure greater than the osmotic pressure. With this process maximum impurities are removed including dissolved organic wastes.

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