Explore topic-wise MCQs in Waste Water Engineering.

This section includes 19 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 fast rinse period of the regenerant liquid for a softener system with the given below data.Calcium Load: 40 ppm as CaCO3Capacity: 37 Kg/m3Correction factor: 0.9Flow rate: 235 m3/hrOperation hours: 10 hrs

A. 25 mins
B. 30 mins
C. 20 mins
D. 15 mins
Answer» B. 30 mins
Discussion
2.

Calculate the rinse volume of the regenerant liquid for the softener system with the given below data.Calcium Load: 60 ppm as CaCO3Capacity: 37 Kg/m3Correction factor: 0.9Flow rate: 35 m3/hrOperation hours: 10 hrs

A. 1.5 m3/hr
B. 3.5 m3/hr
C. 4.9 m3/hr
D. 2.5 m3/hr
Answer» C. 4.9 m3/hr
Discussion
3.

Calculate the regenerant flow required for the softener system with the given below data.Calcium Load: 85 ppm as CaCO3Capacity: 37 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrs

A. 25 m3/hr
B. 28 m3/hr
C. 12 m3/hr
D. 21 m3/hr
Answer» E.
Discussion
4.

Calculate the fast rinse flow of the regenerant liquid for a softener with the below given data.Magnesium Load: 10 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrs

A. 4.5 m3 /hr
B. 7.2 m3/hr
C. 1.7 m3 /hr
D. 7.5 m3/hr
Answer» C. 1.7 m3 /hr
Discussion
5.

Calculate the diameter of the softener vessel required for the below given data.Magnesium Load: 500 ppm as CaCO3Capacity: 57 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrsLinear velocity: 16.6 m3/h/ m3Space velocity: 20 m3/h/ m3

A. 5.2 m
B. 5.0 m
C. 7.6 m
D. 9.8 m
Answer» B. 5.0 m
Discussion
6.

Calculate the area of the softener vessel required for the following information.Magnesium Load: 180 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrsLinear velocity: 16.6 m3/h/ m3Space velocity: 20 m3/h/ m3

A. 8.5 m2
B. 11.6 m2
C. 9.7 m2
D. 8.5 m3
Answer» C. 9.7 m2
Discussion
7.

Calculate the theoretical softener resin bed depth for the following data:Magnesium Load: 130 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrsLinear velocity: 16.6 m3/h/ m3Space velocity: 20 m3/h/ m3

A. 1.5 m
B. 1.2 m3
C. 2.6 m
D. 2.5 m
Answer» C. 2.6 m
Discussion
8.

Calculate the amount of softener resin required for the following information.Magnesium: 80 ppm as CaCO3Capacity: 47 Kg/m3Correction factor: 0.9Flow rate: 135 m3/hrOperation hours: 20 hrs

A. 4.5 m3
B. 3.5 m3
C. 5.1 m3
D. 2.5 m3
Answer» D. 2.5 m3
Discussion
9.

Which is the commonly used chelator?

A. Rhodamine B
B. EDTA
C. Chlorine
D. Bromine
Answer» C. Chlorine
Discussion
10.

________ is used in detergents to soften water.

A. Hydraulic acid
B. Sulphuric acid
C. Citric acid
D. Chlorine
Answer» D. Chlorine
Discussion
11.

WHICH_IS_THE_COMMONLY_USED_CHELATOR??$

A. Rhodamine B
B. EDTA
C. Chlorine
D. Bromine
Answer» C. Chlorine
Discussion
12.

________ is used in detergents to soften water?

A. Hydraulic acid
B. Sulphuric acid
C. Citric acid
D. Chlorine
Answer» D. Chlorine
Discussion
13.

_____ is added to hard water to make it softer.

A. Lime
B. Chlorine
C. Hydraulic acid
D. Sulphuric acid
Answer» B. Chlorine
Discussion
14.

Ion exchange resins contain cation functional groups.

A. True
B. False
Answer» C.
Discussion
15.

Ion exchange resins are ______

A. Inorganic polymers
B. Organic polymers
C. Sandy materials
D. Liquids
Answer» C. Sandy materials
Discussion
16.

Which of these methods does not remove hardness?

A. Reverse osmosis
B. Ion exchange resins
C. Chelating agents
D. Sedimentation
Answer» E.
Discussion
17.

________ form insoluble salts.

A. Aluminium ions
B. Sodium ions
C. Calcium ions
D. Manganese ions
Answer» D. Manganese ions
Discussion
18.

Soft water can foul plumbing.

A. True
B. False
Answer» C.
Discussion
19.

________ is the removal of calcium, magnesium and certain other metal cations in hard water.

A. Disinfection
B. Sedimentation
C. Softening
D. Cleaning
Answer» D. Cleaning
Discussion