Question 71 : Which of the following is the expression of the Rose 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) /e⁴ ) * (v²/g)d) hf = f* (L/(s *d)) * ((1-e) /e² ) * (v²/g)
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Question 72 : The thickness of Anthracite used in dual media filter is
1. 10-20cm
2. 20-30cm
3. 30-40cm
4. 40-50cm
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Question 73 : Consider the following statements regarding diatomite filters.
1. They are not used for water having high turbidity.
2. They are not suitable for municipal water supplies.
3. They are not used for temporary and shifting camps.
Which of the above statement is/are false?
1. 1, 2,3
2. 1 only
3. 2 only
4. 3 only
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Question 74 : Which of the following statement is correct?
1. Ignition loss of filter should not exceed 3%
2. Wearing loss of filter sand should not exceed 5%
3. The range of CU for the slow sand filter is 3-5
4. The range of CU for the rapid sand filter is 3-5
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Question 75 : Which type of filter is used in treating swimming pool water?
1. Slow sand filter
2. Rapid sand filter
3. Dual media filter
4. Pressure filter
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Question 76 : In which of the following filter, water is passed under higher pressure?
1. Slow sand filter
2. Rapid sand filter
3. Dual media filter
4. Pressure filter
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Question 77 : In which action of filtration, colloidal particles is removed?
1. Mechanical Straining
2. Sedimentation
3. Biological mechanism
4. Electrolytic action
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Question 78 : The turbidity of water applied to rapid sand filter is less than _______
1. 35-40ppm
2. 10-20ppm
3. 30-40ppm
4. 10-15ppm
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Question 79 : In which type of filter, the filtration is done in two opposite directions at the same time?
1. Dual media filter
2. Mixed media filter
3. Bi-flow filter
4. Rapid sand filter
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Question 80 : In which type of under drainage system of rapid sand filter, laterals are provided with strainers?
1. Perforated pipe system
2. Pipe and strainer system
3. Wheeler system
4. Wagner system
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