Question 101 : Which of the following has highest shape factor as stated by Carmen?
1. Ottawa sand
2. Pulverized coal
3. Rounded coal
4. Angular sand
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Question 102 : Consider the following statement
1. The penetration of suspended matter is deep in the slow sand filter
2. The penetration of suspended matter is superficial in the rapid sand filter
3. Coagulation is not required in the slow sand filter
Which of the above statement is/are correct?
1. Only 3
2. 1, 2
3. 1, 2, 3
4. 2, 3
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Question 103 : When does the particle become suspended in expanded bed?
1. When superficial velocity is greater than critical velocity
2. When superficial velocity is less than critical velocity
3. When superficial velocity is equal to critical velocity
4. When superficial velocity is constant
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Question 104 : The bacterial removal efficiency of the rapid sand filter is ______ in comparison to slow sand filter.
1. More
2. Less
3. Equal
4. Better
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Question 105 : The thickness of sand bed of a pressure filter is_____ cm
1. 10-20
2. 20-30
3. 30-50
4. 50-60
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Question 106 : The value of specific gravity for Garnet sand is ____
1. 2.1
2. 3.6
3. 4.2
4. 5.1
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Question 107 : ____ represents the size of sand particle such that 10% of particles are finer than this size.
1. D_0.1
2. D₁
3. D₁₀
4. D₁₀₀
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Question 108 : _______ type of trouble in filter is caused by the released of dissolved air and gases from water.
1. Air binding
2. Clogging
3. Mud balls
4. Jetting
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Question 109 : The maximum daily demand of a city is 24*105 and the rate of filtration is 100 per litre per hour per m². What is the area of the filter?
1. 10
2. 100
3. 1000
4. 1500
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Question 110 : What is the maximum filter head up to which slow sand filters are worked upon?
1. 25cm
2. 50cm
3. 75cm
4. 100cm
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