Question 31 : __________ is an operation designed to force agitation in the fluid and induce coagulation.
1. Sedimentation
2. Flocculation
3. Disinfection
4. Aeration
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Question 32 : Why Magnesium carbonate is not commonly preferred as coagulant?
1. It is expensive
2. It does not remove color
3. Formation of sludge
4. The time required for floc formation is less
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Question 33 : The detention period of the vertical flow clarifier is
1. 1-1.5
2. 2
3. 3.5
4. 4
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Question 34 : What indicates the permanent hardness when alum is added to water?
1. Al (OH)₃
2. CaSO₄
3. CO₂
4. Ca (OH)₃
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Question 35 : In which type of sedimentation, flocculent suspension of intermediate concentration takes place?
1. Type I sedimentation
2. Type II sedimentation
3. Type III sedimentation
4. Type IV sedimentation
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Question 36 : What is the detention period of a clarifier used in the treatment of water?
1. 1hour
2. 2hours
3. 3hours
4. 4hours
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Question 37 : Which gas is released when alum is added to water?
1. Al (OH)₃
2. CaSO₄
3. CO₂
4. Ca (OH)₃
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Question 38 : The rate of change of velocity per unit distance normal to a section is called_______
1. Mean velocity
2. Average velocity
3. Mean velocity gradient
4. Velocity gradient
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Question 39 : In which type of settling, sedimentation of discrete particles takes place?
1. Zone settling
2. Compression settling
3. Hindered settling
4. Discrete settling
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Question 40 : State whether the following statement is true or false.
The sedimentation basin should be made as deep as possible.
1. True
2. False
3.
4.
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