Explore topic-wise MCQs in Waste Water Engineering.

This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Waste Water Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

Lamella Clarifier works on which principle?

A. Cocurrent settling
B. Countercurrent settling
C. Cross flow settling
D. Hindered settling
Answer» C. Cross flow settling
Discussion
2.

When will the particles settle in a tank which is subjected to countercurrent settling?

A. V<(VƟ – V sinƟ)/v cosƟ
B. V>= VƟ/v cosƟ
C. V>= (VƟ – V sinƟ)/v cosƟ
D. V<VƟ/v cosƟ
Answer» D. V<VƟ/v cosƟ
Discussion
3.

How is the length of the surface calculated in case of countercurrent settling?

A. Lp=wVƟ/ v cos Ɵ
B. Lp=(VƟ – V sinƟ)/ v cos Ɵ
C. Lp=w(VƟ – V sinƟ)
D. Lp=w(VƟ – V sinƟ)/ v cos Ɵ
Answer» E.
Discussion
4.

HOW_IS_THE_LENGTH_OF_THE_SURFACE_CALCULATED_IN_CASE_OF_COUNTERCURRENT_SETTLING??$

A. L<sub>p</sub>=wV<sub>Ɵ</sub>/ v cos Ɵ
B. L<sub>p</sub>=(V<sub>Ɵ</sub> – V sinƟ)/ v cos Ɵ
C. L<sub>p</sub>=w(V<sub>Ɵ</sub> – V sinƟ)
D. L<sub>p</sub>=w(V<sub>Ɵ</sub> – V sinƟ)/ v cos Ɵ
Answer» E.
Discussion
5.

Lamella Clarifier works on which principle?$

A. Cocurrent settling
B. Countercurrent settling
C. Cross flow settling
D. Hindered settling
Answer» C. Cross flow settling
Discussion
6.

When will the particles settle in a tank which is subjected to countercurrent settling?$

A. V<(V<sub>Ɵ</sub> – V sinƟ)/v cosƟ
B. V>= V<sub>Ɵ</sub>/v cosƟ
C. V>= (V<sub>Ɵ</sub> – V sinƟ)/v cosƟ
D. V<V<sub>Ɵ</sub>/v cosƟ
Answer» D. V<V<sub>‚Äö√†√ú‚àö¬∫</sub>/v cos‚Äö√†√ú‚àö¬∫
Discussion
7.

How is the height of the sludge calculated in a sludge drying bed?

A. H<sub>t</sub>-H<sub>x</sub>=(H<sub>2</sub>-H<sub>x</sub>)ei<sup>t2</sup>
B. H<sub>t</sub>=(H<sub>2</sub>-H<sub>x</sub>)ei<sup>t2</sup>
C. H<sub>t</sub>-H<sub>x</sub>=(H<sub>2</sub>)ei<sup>t2</sup>
D. H<sub>t</sub>-H<sub>x</sub>=(H<sub>x</sub>)ei<sup>t2</sup>
Answer» B. H<sub>t</sub>=(H<sub>2</sub>-H<sub>x</sub>)ei<sup>t2</sup>
Discussion
8.

What is the major assumption made when solid flux method is used to find the area of the sedimentation basin?

A. Settling basin is not operating at a steady state
B. Settling basin is operating at an adiabatic state
C. Settling basin is operating at a steady state
D. Settling basin is operating at an isobaric state
Answer» D. Settling basin is operating at an isobaric state
Discussion
9.

How is the critical concentration of sludge thickener tank calculated?

A. H<sub>u</sub>= C<sub>0</sub><sup>2</sup> H<sub>0</sub>/ Cu
B. H<sub>u</sub>= C<sub>0</sub> H<sub>0</sub>/ Cu<sub>2</sub>
C. H<sub>u</sub>= Cu H<sub>0</sub>/ C<sub>o</sub>S
D. H<sub>u</sub>= C<sub>0</sub> H<sub>0</sub>/ Cu
Answer» E.
Discussion
10.

How is the area of a sludge thickening tank calculated?

A. A=2QT<sub>a</sub>/H<sub>0</sub>
B. A=QT<sub>a</sub>/H<sub>0</sub>
C. A=QT<sub>a</sub>/2H<sub>0</sub>
D. A=QT<sub>a</sub>/H<sub>0</sub><sup>2</sup>
Answer» C. A=QT<sub>a</sub>/2H<sub>0</sub>
Discussion
11.

How is the length of the surface of a settling tank determined in case of cross- flow settling?

A. L<sub>p</sub>=wVƟ/ v cos Ɵ
B. L<sub>p</sub><wVƟ/ v cos Ɵ
C. L<sub>p</sub>= (VƟ – V sinƟ)/ v cos Ɵ
D. L<sub>p</sub><(VƟ – V sinƟ)/ v cos Ɵ
Answer» B. L<sub>p</sub><wV‚Äö√†√ú‚àö¬∫/ v cos ‚Äö√†√ú‚àö¬∫
Discussion
12.

In countercurrent settling how is the solid suspension fed?

A. From the bottom
B. From the sides
C. From the top
D. Flow is up the plates
Answer» D. Flow is up the plates
Discussion
13.

Which mode of settling are tube settlers based on?

A. Counter current settling
B. Cocurrent settling
C. Cross flow settling
D. Flocculant settling
Answer» B. Cocurrent settling
Discussion
14.

What is the product obtained when a coagulant is mixed with wastewater?

A. Sediments
B. Acid
C. Floc
D. Grit
Answer» B. Acid
Discussion
15.

What is type IV settling also called as?

A. Zone settling
B. Hindered settling
C. Compression settling
D. Expansion settling
Answer» D. Expansion settling
Discussion
16.

Type III settling is called as hindered settling.

A. True
B. False
Answer» B. False
Discussion
17.

How many types of settling are present?

A. 2
B. 3
C. 4
D. 6
Answer» D. 6
Discussion
18.

Which is the primary force acting on the Settleable particles?

A. Gravitational force
B. Centrifugal force
C. Mechanical force
D. Radial force
Answer» B. Centrifugal force
Discussion
19.

Settling tanks are also called as sedimentation tanks.

A. True
B. False
Answer» B. False
Discussion
20.

_______ is a process by which particles settle to the bottom of the liquid.

A. Settling
B. Coagulation
C. Sedimentation
D. Filtration
Answer» B. Coagulation
Discussion