engineering recuitment WBPSC JE Civil Mock Test 2022 Environmental Engineering Sewage Sewage Treatment
Match List - I with List-II and select the correct answer using the codes given below the lists:
|
List - I (Treatment Unit) |
List - II (Detention Time) |
|
A. Grit chamber |
i. Six hours |
|
B. Primary sedimentation |
ii. Two minutes |
|
C. Activated sludge |
iii. Two hours |
|
D. Sludge digestion |
iv. Twenty days |
1
A - iii, B - i, C - iv, D - ii
2
A - ii, B - iii, C - i, D - iv
3
A - ii, B - i, C - iii, D - iv
4
A - i, B - ii, C - iii, D - iv