Question 21 : The coarser layer used in a dual media filter is of
1. Sand
2. Anthracite
3. Garnet sand
4. Rice husk
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Question 22 : What is the value of uniformity coefficient in a rapid sand filter?
1. 1
2. 1.5
3. 2
4. 2.5
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Question 23 : What is the frequency of cleaning of a slow sand filter?
1. 1 week
2. 1-3 months
3. 2-3 days
4. 2-3 weeks
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Question 24 : What is the permissible negative head loss of a rapid sand filter?
1. 0.2-1m
2. 0.1-0.5m
3. 0.5-2m
4. 0.8-1.2m
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Question 25 : What is the thickness of a layer of a diatomite filter?
1. 1mm
2. 2mm
3. 3mm
4. 4mm
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Question 26 : The head loss through the bed of solids of the filter can be determined by
1. Carmen-Kozney equation
2. Rose equation
3. Carmen-Kozney and Rose equation
4. Charles equation
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Question 27 : State whether the following statement is true of false.
Filtration operation in pressure filter is same as in rapid sand filter.
1. True
2. False
3.
4.
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Question 28 : The effective size of a pressure sand filter is ______
1. 0.45mm
2. 0.7mm
3. 0.8mm
4. 0.9mm
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Question 29 : In which of the following filter, two layers filtering media is provided for filtration?
1. Slow sand filter
2. Pressure filter
3. Rapid sand filter
4. Dual media filter
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Question 30 : In which action of filtration, removal of particulate matter takes place?
1. Mechanical Straining
2. Sedimentation
3. Biological mechanism
4. Electrolytic action
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