Question 41 : Which of the following represents the correct relation between dimensionless friction factor f and Reynolds number?
1. f = 150* ((1-e) /R²) +1.75
2. f = 150* ((1-e) /R) +1.75
3. f = 150* ((1-e) /R³) +1.75
4. f = 150* ((1-e²) /R) +1.75
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Question 42 : The final loss of head in slow sand filter is ______ than rapid sand filter.
1. Higher
2. Lower
3. Slightly Lower
4. Equivalent
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Question 43 : Consider the following statements regarding sand as filter material.
1. It should be free from clay or silt
2. Organic matter should be present in the sand
3. It should be nonuniform
Which of the above statement is/are correct?
1. 1, 2
2. 1 only
3. 2, 3
4. 1, 2, 3
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Question 44 : The superficial velocity in a stratified bed is equal to
1. Terminal settling velocity
2. Terminal settling velocity * porosity
3. Terminal settling velocity * (porosity) ²
4. Terminal settling velocity * (porosity) ^4.5
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Question 45 : Which of the following order is correct regarding the thickness of layer of the materials used in the mixed media filter?
1. Anthracite coal < Sand > Garnet sand
2. Anthracite coal > Sand >> Garnet sand
3. Anthracite coal = Sand = Garnet sand
4. Anthracite coal < Sand < Garnet sand
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Question 46 : Which of the following is correct regarding the cheapest filter material used in water treatment?
1. Sand>Anthracite>Garnet sand
2. Sand<Anthracite>Garnet sand
3. Sand<Anthracite<Garnet sand
4. Sand=Anthracite>Garnet sand
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Question 47 : The diatomite is applied on the septum at the rate of ______
1. 100gm/m²
2. 200gm/m²
3. 300gm/m²
4. 400gm/m²
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Question 48 : The thickness of the base material on which filter media are supported is
1. 10-100cm
2. 20-80cm
3. 30-75cm
4. 10-30cm
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Question 49 : Which material is provided for the down-flow bed in dual media bi-flow filter?
1. Coal sand
2. Garnet sand
3. Rice husk
4. Graphite
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Question 50 : When the loss of the head exceeds the static head, the head becomes _____
1. Positive
2. Negative
3. Constant
4. Zero
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