Question 41 : Which device solved the problem of unstable hydraulic conditions and operation of sludge removal equipment?
1. Centrifugal pump
2. Pulsator clarifier
3. Tube settler
4. Flocculator
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Question 42 : What is the dimension formula of mean velocity gradient?
1. 1/T
2. 1/T2
3. T
4. T2
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Question 43 : Which of the following statement is wrong regarding Iron salt?
1. Iron salt produces less floc than Alum
2. Detention time for sedimentation by using Iron salt as coagulant is less
3. Handling of Iron salt requires some skills
4. Iron removes H₂S, taste and odor
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Question 44 : Alum is effective when pH of water is between ____
1. 8-10
2. 6-8
3. 6.5-8.5
4. 7-9
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Question 45 : Which of the following represents the correct relation between displacement velocity and diameter of the particle?
1. v1 = (8Bg (G-1) d/f) ^1/2
2. v1 = (8Bg (G-1) d2/f)²
3. v1 = (8Bg (G-1) d/f)
4. v1 = (8Bg (G-1) d/f)²
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Question 46 : In a fill and draw type sedimentation tank, a detention period of ____ hours is provided.
1. 6
2. 12
3. 18
4. 24
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Question 47 : The time period for which the water is stored in a sedimentation tank is called _____
1. Time of flow
2. Frequency of flow
3. Settling time
4. Detention period
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Question 48 : Range of Displacement efficiency in the plain sedimentation tank is
1. 0.25-0.5
2. 0.1-0.2
3. 0.5-0.8
4. 0.3-0.6
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Question 49 : The pulsator clarifier is a type of
1. Horizontal flow sludge tank
2. Vertical flow sludge tank
3. Circular sludge tank
4. Plain sedimentation tank
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Question 50 : What is the desirable value of mean velocity gradient in a flocculator?
1. 20-50sec^-1
2. 20-75sec^-1
3. 50-100sec^-1
4. 30-50sec^-1
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