Test: Sewage Collection - 2 | 10 Questions MCQ Test Topicwise Question Bank for Civil Engineering Chemical Engineering

QUESTION: 1

Testing of sewer pipes may involve

A.
water test
B.
mirror test
C.
ball test
D.
all these tests

Solution:

QUESTION: 2

Manholes are generally located

A.
at all changes of direction of sewer
B.
at all changes of gradient of sewer
C.
at all junctions of different sewers
D.
all of the above

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

A.
inverted syphon
B.
sag pipe
C.
depressed sewer
D.
all of these

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

A.
0.5 m/s
B.
1.0 m/s
C.
2 m/s
D.
2.0 m/s

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

A.
the minimum velocity of flow required to maintain a certain amount of solids in the flow
B.
the maximum velocity of flow required to maintain a certain amount of solids in the flow
C.
such flow velocity as would be sufficient to flush out any deposited solids in the sewer
D.
such flow velocity as would be sufficient to ensure that sewage does not remain in the sewer

Solution:

QUESTION: 6

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

A.
rainfall intensity
B.
velocity in the sewer
C.
time of travel
D.
area served by the sewer

Solution:

Time of concentration (t_c) 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 't_c' 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

A.
0.33
B.
0.50
C.
0.95
D.
1.00

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

A.
a
B.
b
C.
c
D.
d

Solution:

QUESTION: 9

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

A.
peak hourly rate of flow
B.
average hourly rate of flow
C.
minimum hourly rate of flow
D.
sewer running half full

Solution:

QUESTION: 10

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

A.
velocity in sewer X must be equal to velocity in sewer Y
B.
slope of sewer X must be equal to slope of sewer Y
C.
tractive force intensity generated in sewer X must be same as that in sewer Y
D.
the roughness coefficient of X sewer material should be same as that of Y sewer material

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.

Test: Sewage Collection - 2

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

Testing of sewer pipes may involve

Manholes are generally located

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

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