Explore topic-wise MCQs in Waste Water Engineering.

This section includes 29 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.

Calculate the amount of air required for the equalization tank with the following detailsFlow: 500 m3/hBOD load: 800 mg/L

A. 950 m3/hr
B. 800 m3/hr
C. 2000 m3/hr
D. 785 m3/hr
Answer» D. 785 m3/hr
Discussion
2.

Calculate the number of fine diffusers required for the following data.Flow: 300 m3/hBOD load: 1000 mg/L

A. 150
B. 146
C. 170
D. 186
Answer» C. 170
Discussion
3.

Calculate the number of diffusers for the following.Blower Flow rate: 535 m3/hrCoarse diffusers are used.

A. 54
B. 60
C. 65
D. 70
Answer» B. 60
Discussion
4.

Calculate the amount of air required for the following details.Flow: 300 m3/hBOD load: 800 mg/L

A. 550 m3/hr
B. 518 m3/hr
C. 700m3/hr
D. 618 m3/hr
Answer» D. 618 m3/hr
Discussion
5.

Calculate the theoretical oxygen requirement for the following details.Flow: 200 m3/hBOD load: 800 mg/L

A. 45.5 Kg/h of O2/hr
B. 23.05 Kg/h of O2/hr
C. 25.05 Kg/h of O2/hr
D. 50.5 Kg/h of O2/hr
Answer» C. 25.05 Kg/h of O2/hr
Discussion
6.

What is the value for α for mechanical aeration aeration for the following equation.α= KLA(wastewater) /KLA(Tap water)

A. 0.6-1.2
B. 0.2-0.3
C. 0.3-0.5
D. >1.2
Answer» B. 0.2-0.3
Discussion
7.

What is the value for α for diffused aeration for the following equation.α= KLA(wastewater) /KLA(Tap water)

A. 0.4-0.8
B. 0.2-0.3
C. 0.8-1
D. >1
Answer» B. 0.2-0.3
Discussion
8.

What is the value for Ɵ for mechanical and diffused aeration for the following equation?KLA(T) = KLA(20 Degree Celsius)ƟT-20

A. 1.015
B. 1.1
C. 1.024
D. 1.04
Answer» D. 1.04
Discussion
9.

How many types of aerators are present?

A. 2
B. 3
C. 4
D. 5
Answer» D. 5
Discussion
10.

Which of the following is not used for iron removal?

A. Oxidation
B. Reduction
C. Gasification
D. Absorption
Answer» C. Gasification
Discussion
11.

H2S is highly soluble in water.

A. Tue
B. False
Answer» B. False
Discussion
12.

High solubility of CO2 ______ pH.

A. Maintains
B. Reduces
C. Increases
D. Nullifies
Answer» C. Increases
Discussion
13.

What does OTR stand for?

A. Oxygen transfer rate in standard conditions
B. Oxygen transfer rate in clean water
C. Oxygen transfer efficiency in clean water
D. Oxygen transfer efficiency in standard conditions in the clean water
Answer» C. Oxygen transfer efficiency in clean water
Discussion
14.

WHICH_OF_THE_FOLLOWING_IS_NOT_USED_FOR_IRON_REMOVAL??$

A. Oxidation
B. Reduction
C. Gasification
D. Absorption
Answer» C. Gasification
Discussion
15.

What is the value for Ɵ for mechanical and diffused aeration for the following equation?$#

A. </sub> = K<sub>LA(20 Degree Celsius)</sub>Ɵ<sup>T-20</sup>
B. 1.015
C. 1.1
D. 1.024
Answer» D. 1.024
Discussion
16.

How_many_types_of_aerators_are_present?$

A. 2
B. 3
C. 4
D. 5
Answer» D. 5
Discussion
17.

Calculate the number of fine diffusers required for the following data.

A.
B.
Answer» C.
Discussion
18.

Calculate the number of diffusers for the following.

A.
B.
Answer» B.
Discussion
19.

Calculate the theoretical oxygen requirement for the following details.

A.
B.
Answer» C.
Discussion
20.

What is the value for α for mechanical aeration aeration for the following equation.$

A. </sub> /K<sub>LA(Tap water)</sub>
B. 0.6-1.2
C. 0.2-0.3
D. 0.3-0.5
Answer» B. 0.6-1.2
Discussion
21.

What is the value for α for diffused aeration for the following equation.$

A. </sub> /K<sub>LA(Tap water)</sub>
B. 0.4-0.8
C. 0.2-0.3
D. 0.8-1
Answer» B. 0.4-0.8
Discussion
22.

H2S is highly soluble in water?

A. Tue
B. False
Answer» B. False
Discussion
23.

What is the range of pH above which aeration is required?

A. 2 mg/L
B. 5 mg/L
C. 8 mg/L
D. 10 mg/L
Answer» E.
Discussion
24.

High solubility of CO2 ______ pH.

A. Maintains
B. Reduces
C. Increases
D. Nullifies
Answer» C. Increases
Discussion
25.

_________ is the actual mass of oxygen transferred per unit time.

A. OTR
B. SOTR
C. OTE
D. SOTE
Answer» B. SOTR
Discussion
26.

What is the symbol used to define the ratio of the process to clean water mass transfer?

A. Alpha
B. Beta
C. Gamma
D. Sigma
Answer» B. Beta
Discussion
27.

Which of the following is not a standard condition for aeration?

A. 40ÀöC
B. 1 atm
C. Zero salinity
D. Zero DO
Answer» B. 1 atm
Discussion
28.

What is the full form of OTR in Diffused Mechanical Aeration Systems?

A. Oxygen transfer rate in standard conditions
B. Oxygen transfer rate in clean water
C. Oxygen transfer efficiency in clean water
D. Oxygen transfer efficiency in standard conditions in the clean water
Answer» C. Oxygen transfer efficiency in clean water
Discussion
29.

Aeration consumes less energy in activated sludge process compared to other processes.

A. True
B. False
Answer» C.
Discussion