Question 81 : The filter run in rapid sand filter should not be less than _____ hours.
1. 1
2. 6
3. 12
4. 24
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Question 82 : The finer the suspended impurities to be removed,
1. Larger will be the sand size
2. Smaller will be the sand size
3. Smaller will be the surface area of sand grains
4. Narrow will be the sand depth of the bed
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Question 83 : Which of the following is the expression of the Carmen equation where symbols have their usual meanings?
1. hf = f* (L/(s *d)) * ((1-e)/e³) * (v²/g)
2. hf = f* (L/(s *d)) * ((1-e)/e³) * (v/g)
3. hf = f* (L/(s *
4. ) * ((1-e)/e) * (v²/g)d) hf = f* (L/(s *d)) * ((1-e)/e²) * (v²/g)
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Question 84 : The effective size of a rapid sand filter is ______
1. 0.45mm
2. 0.7mm
3. 0.8mm
4. 0.9mm
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Question 85 : What is the ratio in which coal, sand and garnet are present in the mixed media filter?
1. 2: 3: 5
2. 4: 2: 1
3. 6: 3: 1
4. 1: 2: 3
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Question 86 : State whether the following statement is true or false
Rose equation is valid for beds in which voids are clear and unobstructed.
1. True
2. False
3.
4.
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Question 87 : Which device is used for screening stored water which do not contain microscopic sized particles?
1. Tube settler
2. Clarifier
3. Flocculator
4. Micro-Strainers
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Question 88 : What is the diameter of drum of a Micro-Strainer?
1. 1m
2. 2m
3. 3m
4. 4m
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Question 89 : Which device is used to supply air for the agitation of sand grains during washing of filters?
1. Rate control device
2. Tube settlers
3. Air compressors
4. Flocculator
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Question 90 : What is the range of pressure in pressure filter?
1. 1-5 kg/cm²
2. 2-5 kg/cm²
3. 3-7 kg/cm²
4. 1-8 kg/cm²
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