1
GATE CE 2025 Set 1
MCQ (More than One Correct Answer)
+1
-0
Aeration is employed as a treatment option for the removal of several pollutants from contaminated water. Identify the pollutant(s), where aeration is employed as a part of their removal:
A
Iron
B
Cadmium
C
Manganese
D
Zinc
2
GATE CE 2023 Set 2
MCQ (More than One Correct Answer)
+1
-0
Which of the following is/are NOT active disinfectant(s) in water treatment?
A
OH (hydroxyl radical)
B
O3 (ozone)
C
OCl (hypochlorite ion)
D
Cl (chloride ion)
3
GATE CE 2022 Set 2
MCQ (Single Correct Answer)
+1
-0.33

A process equipment emits, 5 kg/h of volatile organic compounds (VOCs). If a hood placed over the process equipment captures 95% of the VOCs, then the fugitive emission in kg/h is

A
0.25
B
4.75
C
2.50
D
0.48
4
GATE CE 2022 Set 1
Numerical
+1
-0

A water treatment plant has a sedimentation basin of depth 3 m, width 5 m, and length 40 m. The water inflow rate is 500 m3/h. The removal fraction of particles having a settling velocity of 1.0 m/h is ________. (round off to one decimal place) (Consider the particle density as 2650 kg/m3 and liquid density as 991 kg/m3)

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