Waste Water Engineering MCQ Questions & Answers

41

The screens are fixed

A) Perpendicular to the direction of flow B) Parallel to the direction of flow C) At an angle 30° to 60° to the direction of flow D) None of these

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Answer & Solution

Answer: Option C

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42

In case of sewer lines

A) Water test is carried out to check water tightness of the joints B) Test for straightness is carried out with the help of a lamp and mirror C) Obstruction test is carried out with the help of smooth ball of diameter 13 mm D) All the above

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Answer & Solution

Answer: Option D

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43

The pH value of fresh sewage is usually

A) Equal to 7 B) More than 7 C) Less than 7 D) Equal to zero

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Answer & Solution

Answer: Option B

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44

If is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is

A) 1.250 D B) 1.350 D C) 1.425 D D) 1.625 D

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Answer & Solution

Answer: Option D

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45

If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is

A) 1 in 60 B) 1 in 100 C) 1 in 120 D) None of these

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Answer & Solution

Answer: Option C

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46

If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

A) 1 in 60 B) 1 in 100 C) 1 in 120 D) None of these

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Answer & Solution

Answer: Option B

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47

Pick up the incorrect size of stone ware sewers

A) 52.5 cm B) 67.5 cm C) 82.5 cm D) None of these

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Answer & Solution

Answer: Option D

Solution:

Stoneware sewers are pipes made of vitrified clay, commonly used for wastewater and domestic drainage systems. They are known for their resistance to corrosion, smooth internal surface, and durability in handling sewage flow.

These pipes are manufactured in a range of standard internal diameters as per IS: 651 and other relevant specifications. The usual sizes range from 10 cm to 90 cm in internal diameter, making all the given options valid standard sizes.

Option A (52.5 cm) – Standard size.

Option B (67.5 cm) – Standard size.

Option C (82.5 cm) – Also a standard size, as large-diameter stoneware sewers are available up to 90 cm.

Since all the given sizes (52.5 cm, 67.5 cm, and 82.5 cm) fall within the standard manufacturing range of stoneware sewer pipes, none of them is incorrect.

Therefore, the correct answer is Option D: None of these.

48

The stone ware sewers

A) Are used for carrying sewage and drainage from houses B) Are manufactured from clays and shale C) After casting are dried and burnt at temperature 150°C, 700°C and 1200°C D) All the above

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Answer & Solution

Answer: Option D

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49

Pick up the correct statement from the following:

A) The materials separated by screens, is called screenings B) The screenings are disposed off either by burning or by burial or by dumping C) The process of burning the screenings, is known as compositing D) All the above

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Answer & Solution

Answer: Option D

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50

Pick up the correct statement from the following:

A) The maximum rate of storm runoff is called peak drainage discharge B) Rational method of estimating peak run off, may be used precisely for areas less than 50 hectares C) The period after which the entire area starts contributing to the runoff, is called the time of concentration D) All the above

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Answer & Solution

Answer: Option D

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Waste Water Engineering MCQ Questions & Answers | Civil Engineering