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# Sewage Collection - 2

## 10 Questions MCQ Test Topicwise Question Bank for GATE Civil Engineering | Sewage Collection - 2

Description
This mock test of Sewage Collection - 2 for Civil Engineering (CE) helps you for every Civil Engineering (CE) entrance exam. This contains 10 Multiple Choice Questions for Civil Engineering (CE) Sewage Collection - 2 (mcq) to study with solutions a complete question bank. The solved questions answers in this Sewage Collection - 2 quiz give you a good mix of easy questions and tough questions. Civil Engineering (CE) students definitely take this Sewage Collection - 2 exercise for a better result in the exam. You can find other Sewage Collection - 2 extra questions, long questions & short questions for Civil Engineering (CE) on EduRev as well by searching above.
QUESTION: 1

Solution:
QUESTION: 2

Solution:
QUESTION: 3

### When a sewer line is dropped below the hydraulic gradient line to pass it through an obstruction, the arrangement is known as

Solution:

An inverted siphon is a sewer section constructed lower than the adjacent sewer sections, and it runs full under gravity with pressure greater than the atmosphere. An inverted siphon is usually made of siphon tubes or pipes made of cast iron or concrete.

QUESTION: 4

The slope of a 1.0 m diameter concrete sewer laid at a slope of 1 in 1000, develops a velocity of 1 m/s, when flowing full. When it is flowing half-full, the velocity of flow through the sewer will be

Solution:

For d/D = 0.5; v/V = 1.0
where d is depth of flow
v is flow velocity at depth d
D is diameter of sewer
V is flow velocity at full flow
∴ v = 1.0 m/s

QUESTION: 5

Self-cleansing velocity is

Solution:
QUESTION: 6

In the design of storm sewers, “time of concentration” is relevant to determine the

Solution:

Time of concentration (tc) is the time taken by water droplet to reach the catchment outlet from farthest part. So whole catchment contributes to runoff only when the time of rainfall is greater than 'tc' it is used to determine critical rainfall intensity.

QUESTION: 7

The maximum flow occurs in an egg shaped sewer when the ratio of flow depth to vertical diameter is

Solution:
QUESTION: 8

Match List-I (Unit) with List-ll (Purpose) and select the correct answer using the codes given below the lists:
List-I
A. Leaping weir
B. Gutter inlet
C. Inverted syphon
D. Catch basin

List-II
1. To prevent grit, sand, debris, etc. from entering the storm sewer.
2. To carry the sewer below a stream or railway line
3. To drain rain water from roads to the storm sewer
4. To 'separate storm water and the sanitary sewage

Codes:
A B C D
(a) 4 3 1 2
(b) 4 3 2 1
(c) 3 4 2 1
(d) 3 4 1 2

Solution:
QUESTION: 9

A sewer is commonly designed to attain self- cleansing velocity at

Solution:
QUESTION: 10

If a sewer X is to be designed to generate equivalent self-cleansing action as in sewer Y, then

Solution:

Velocity and discharge are functions of tractive force intensity which depends upon friction coefficient as well as flow velocity. For equal self cleansing tractive force intensity should be same in both sewers.