Explore topic-wise MCQs in Waste Water Engineering.

This section includes 25 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.

What is the capacity of the oil skimmer used?Flow: 90m3/hOil present: 50 ppm

A. 5 LPH
B. 15 LPH
C. 18 LPH
D. 8 LPH
Answer» B. 15 LPH
Discussion
2.

Calculate the Oil load for the following data.Flow rate: 1000 m3/dayOil present: 50 ppm

A. 2.08 Kg/h
B. 1.36 Kg/h
C. 1.48 Kg/h
D. 2.52 Kg/h
Answer» B. 1.36 Kg/h
Discussion
3.

How many plates will be required in a lamella clarifier for the following data?Flow: 120m3/hArea of plate: 1.8m2Rise rate: 0.9 m3/m2/h

A. 75
B. 80
C. 85
D. 90
Answer» B. 80
Discussion
4.

How many plates will be required in a lamella clarifier for the following data?Flow: 40m3/hArea of plate: 1.2 m2Rise rate: 1.2 m3/m2/h

A. 27
B. 25
C. 29
D. 30
Answer» D. 30
Discussion
5.

Calculate the flow per plate in a lamella clarifier for the following data?Flow: 20m3/hArea of plate: 1.2 m2Rise rate: 1.2 m3/m2/h

A. 1.44 m3/h
B. 1.55 m3/h
C. 1.66 m3/h
D. 1.04 m3/h
Answer» B. 1.55 m3/h
Discussion
6.

What is the limit of plate load?

A. 10.7 m/h
B. 8.2 m/h
C. 5.4 m/h
D. 2.9 m/h
Answer» E.
Discussion
7.

What is the retention time for lamella clarifiers?

A. 1-2 h
B. 2-4 h
C. 4-6 h
D. 6-8 h
Answer» B. 2-4 h
Discussion
8.

What is the range of overflow rate for circular clarification unit?

A. 1-3 m3/m2/h
B. 2-8 m3/m2/h
C. 3-10 m3/m2/h
D. 5-12 m3/m2/h
Answer» B. 2-8 m3/m2/h
Discussion
9.

WHAT_IS_THE_RANGE_OF_OVERFLOW_RATE_FOR_CIRCULAR_CLARIFICATION_UNIT??$

A. 1-3 m<sup>3</sup>/m<sup>2</sup>/h
B. 2-8 m<sup>3</sup>/m<sup>2</sup>/h
C. 3-10 m<sup>3</sup>/m<sup>2</sup>/h
D. 5-12 m<sup>3</sup>/m<sup>2</sup>/h
Answer» B. 2-8 m<sup>3</sup>/m<sup>2</sup>/h
Discussion
10.

What is the limit of plate load?$

A. 10.7 m/h
B. 8.2 m/h
C. 5.4 m/h
D. 2.9 m/h
Answer» E.
Discussion
11.

What_is_the_retention_time_for_lamella_clarifiers?$

A. 1-2 h
B. 2-4 h
C. 4-6 h
D. 6-8 h
Answer» B. 2-4 h
Discussion
12.

What is the capacity of the oil skimmer used?

A.
B.
Answer» B.
Discussion
13.

Calculate the Oil load for the following data.

A.
B.
Answer» B.
Discussion
14.

What is the angle at which the plates should be inclined in a lamella clarifier?

A. 70-80 degree
B. 45-60 degree
C. 20-35 degree
D. 35-45 degree
Answer» C. 20-35 degree
Discussion
15.

What is the maximum rise rate in m3/m2/h considered while designing a Lamella clarifier?

A. 1
B. 2
C. 1.2
D. 1.5
Answer» D. 1.5
Discussion
16.

Which of these pollutants does a lamella clarifier remove?

A. TSS
B. BOD
C. TDS
D. Odour
Answer» B. BOD
Discussion
17.

What is the angle of inclination for lamella plates?

A. 20-30Àö
B. 30-40Àö
C. 40-60Àö
D. 50-70Àö
Answer» E.
Discussion
18.

What is the retention time for rectangular clarifiers?

A. 1-2 h
B. 2-3 h
C. 3-6 h
D. 6-8 h
Answer» C. 3-6 h
Discussion
19.

What is the maximum load of solids that lamella clarifiers can handle?

A. 1000 mg/L
B. 2000 mg/L
C. 3000 mg/L
D. 4000 mg/L
Answer» D. 4000 mg/L
Discussion
20.

How much spacing should be provided in between the tubes?

A. 10 mm
B. 20 mm
C. 30 mm
D. 50 mm
Answer» E.
Discussion
21.

What is the length of the tube in lamella clarifiers?

A. 0.5-1 m
B. 1-2 m
C. 2-3 m
D. 3-5 m
Answer» C. 2-3 m
Discussion
22.

Lamella clarifiers are used as pre-treatment ahead of _____

A. PST
B. SST
C. Membrane filters
D. Centrifugal tanks
Answer» D. Centrifugal tanks
Discussion
23.

__________ maintain the required water quality to the membrane without the use of chemicals.

A. Settlers
B. Primary settlers
C. Centrifugal tanks
D. Lamella settlers
Answer» E.
Discussion
24.

Lamella clarifiers can also be used in mining industries.

A. True
B. False
Answer» B. False
Discussion
25.

Lamella clarifier is also called as a inclined plate settler.

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