Question 11 : The reduction of carbon dioxide by cascade aerators is in the range of
1. 10-20%
2. 20-30%
3. 40-50%
4. 50-60%
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Question 12 : State whether the following statement is True or False.
Dealkalization results in removal of all the ions from the water.
1. True
2. False
3.
4.
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Question 13 : The shape factor for circular rods in finding the head loss through the screen is _____
1. 1.79
2. 2.42
3. 1.83
4. 1.45
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Question 14 : Which form of solute stabilization occurs when water passes through limestone?
1. Chlorination
2. Liming
3. Re-carbonation
4. Super-chlorination
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Question 15 : Identify the incorrect statement regarding aeration process.
1. It removes taste and odor
2. It increases the dissolved oxygen content of water
3. It increases the carbon dioxide content of water
4. It is used for mixing chemicals with water
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Question 16 : In which process, excess lime is converted into bicarbonate?
1. Chlorination
2. Liming
3. Re-carbonation
4. Super-chlorination
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Question 17 : ______ are used in fine screen so that they do not get clogged up.
1. Automatic strainers
2. Spray aerators
3. Cascade aerators
4. Gravel bed aerators
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Question 18 : In which unit operation objectionable solutes are converted into unobjectionable forms without removal?
1. Gas transfer
2. Ion transfer
3. Solute stabilization
4. Solids Transfer
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Question 19 : How many types of aerators are commonly used in the treatment of water?
1. 2
2. 3
3. 4
4. 5
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Question 20 : Which of the following process is used to remove the colloidal particles from water?
1. Chemical precipitation
2. Chemical coagulation
3. Ion exchange
4. Adsorption
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