Question 71 : The average time required by water to pass through the settling tank is called _______
1. Detention time
2. Flowing through period
3. Time of flow
4. Mean time
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Question 72 : The chemical compound which is insoluble in water, formed when alum is added to water is _____
1. Al (OH)₃
2. CaSO₄
3. CO₂
4. Ca (OH)₃
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Question 73 : Detention time for a circular tank is given by
1. t =D (D + 0.785H) /Q
2. t = D (0.1D + 0.785H) /Q
3. t = D2 (0.01D + 0.785H)
4. t = D2 (0.01D + 0.785H) /Q
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Question 74 : Settling tank efficiency is reduced by
1. Eddy current
2. Surface current
3. Density current
1. 1, 2
2. 1, 2, 3
3. 2, 3
4. 1, 3
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