Question 91 : The thickness of the suspended matter on top of the sand bed is
1. Directly proportional to head loss
2. Inversely proportional to head loss
3. Independent of the head loss
4. Directly proportional to the square of head loss
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Question 92 : Consider the following statement regarding depth of sand of the rapid gravity filter?
1. It should be checked against breakage of floc
2. The sand depth should lie between 100-200cm
3. The floc should be attached through the sand bed
Which of the above statement is/are correct?
1. Only 1
2. 1, 2
3. 2, 3
4. Only 2
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Question 93 : State whether the following statement is true or false.
Rapid sand filters are very efficient in removal of color.
1. True
2. False
3.
4.
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Question 94 : How the problem of sand incrustation can be minimized?
1. Carbonating the water
2. Proportioning of layers of sand and gravel
3. Surface washing
4. Control of algae growth in the water
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Question 95 : The period of cleaning of a slow sand filter is ______ than rapid sand filter.
1. Smaller
2. Larger
3. Slightly smaller
4. Slightly larger
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Question 96 : What is the effective size of Anthracite when used as a filter material?
1. 0.1-0.2mm
2. 0.2-0.4mm
3. 0.4-0.6mm
4. 0.7-0.75mm
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Question 97 : The uniformity characteristics of sand expressed in terms of .
1. Effective size
2. Effective size and uniformity coefficient
3. Uniformity coefficient
4. Mean velocity
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Question 98 : State whether the following statement is true or false.
The slow sand filter is efficient in removing turbidity of water.
1. True
2. False
3.
4.
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Question 99 : What is the value of specific gravity of sand filter?
1. 2
2. 2.6
3. 3.1
4. 3.5
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Question 100 : In mixed media filter, the filtration is done from ______
1. Fine to finer
2. Coarse to coarser
3. Fine to coarse
4. Coarse to fine
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