This set of Environmental Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Egg Shaped Sewers and Other Sewer Sections”.
1. Which of the following sewer is called as an ovoid sewer?
a) Asbestos cement sewer
b) Egg shaped sewer
c) Plain cement sewer
d) Salt glazed sewer
View Answer
Explanation: Egg shaped sewer is an oval shaped sewer and is also called as an ovoid sewer.
2. Egg shaped sewers are more suitable in a combined system during dry weather flow.
a) True
b) False
View Answer
Explanation: Egg shaped sewers are more suitable in a combined system during maximum rain water flow as for low flows, they give sufficient velocity.
3. Which of the following is incorrect regarding Egg shaped sewer?
a) It is cheap
b) It is difficult to construct
c) It is less stable
d) It is mainly circular in shape
View Answer
Explanation: The Egg shaped sewer is expensive as more material is required than other sewer. Moreover, the cost of construction is high.
4. The upper portion of Egg shaped sewer is called as _____
a) Level
b) Arch
c) Invert
d) Wedge
View Answer
Explanation: The upper portion of Egg shaped sewer is called as arch which is circular in shape and is larger than the lower circular section.
5. The Egg shaped sewer provides ____ velocity for low flows over the circular sewer of equal capacity.
a) Lesser
b) Higher
c) Slightly higher
d) Very high
View Answer
Explanation: The Egg shaped sewer provides slightly higher velocity for low flows over the circular sewer of equal capacity. This makes it useful during a combined sewerage system.
6. The lower portion of Egg shaped sewer is known as _____
a) Roof
b) Invert
c) Arch
d) Wedge
View Answer
Explanation: The lower portion of Egg shaped sewer is known as invert which is circular in shape and is smaller than the arch.
7. The height of standard section of Egg shaped sewer is ______ the new shaped section.
a) Equal to
b) Twice of
c) Less than
d) Half of
View Answer
Explanation: The height of both the standard and a new shaped section of Egg shaped sewer is 3 times the radius of sewer. So, their heights are equal.
8. The ratio of the width of the standard section and new shaped section of Egg shaped section is __________
a) 1:2
b) 2:1
c) 1:1
d) 1:3
View Answer
Explanation: Width of standard section = 2 times radius of sewer
Width of new shaped section = 2 times radius of sewer
So, their ratio = 1:1.
9. The radius of invert of the standard section of Egg shaped sewer is ____ of the new shaped section.
a) Twice
b) Thrice
c) Half
d) Equivalent
View Answer
Explanation: Let k be the radius of sewer. The radius of invert of the standard section= 0.5k and the radius of invert of the new shaped section = 0.25k. So, radius of invert of the standard section is twice the new shaped section of Ovoid sewer.
10. _______ denotes the characteristic size of circular cross section of sewer.
a) DN
b) MN
c) QW
d) SE
View Answer
Explanation: DN denotes the internal diameter of circular cross section of sewer. It is measured in mm.
11. The arch cross section is divided into how many types?
a) 2
b) 3
c) 4
d) 5
View Answer
Explanation: The arch cross section is divided into 3 types, namely Normal, Extended and Squashed arch cross section.
12. One side walkway is a type of __________
a) Circular cross section
b) Channel cross section
c) Ovoid cross section
d) Arch cross section
View Answer
Explanation: The channel cross section is divided into 2 types. It includes One side walkway and Two side walkway channel cross section.
13. Which of the following ovoid cross section has the maximum nominal size range?
a) Squashed
b) Extended
c) Normal
d) Wide
View Answer
Explanation: Squashed ovoid cross section has the maximum nominal size range with breadth and height as 3200mm.
14. There is less deposition of waste in ovoid cross-section.
a) True
b) False
View Answer
Explanation: Ovoid sewer cross-section offers less deposition of waste which results in better handling of waste in sewage treatment plant during dry weather and reduced emission of waste during wet weather.
Sanfoundry Global Education & Learning Series – Environmental Engineering.
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