Question 51 : In which type of sedimentation, flocculent suspension of high concentration takes place?
1. Type I sedimentation
2. Type II sedimentation
3. Type III sedimentation
4. Type IV sedimentation
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Question 52 : Settling velocity of a spherical body in a viscous fluid is given by
1. Reynolds law
2. Newton's law
3. Stokes law
4. Charles law
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Question 53 : When impurities are separated by the gravitation of settling particles, the operation is called _____
1. Sedimentation with coagulant
2. Plain sedimentation
3. Secondary sedimentation
4. Disinfection
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Question 54 : In which type of tube settler, tubes are slightly inclined in the direction of normal flow?
1. Solid contact clarifier
2. Steeply inclined tube settler
3. Vertical tube settler
4. Horizontal tube settler
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Question 55 : The chemical composition of Alum is
1. Al₂ (SO₄)₃.18H₂O
2. Al₂ (SO₄)₂.18H₂O
3. Al₃ (SO₄)₂.18H₂O
4. Al₄ (SO₄)₃.18H₂O
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Question 56 : The detention period of a rectangular tank is given by
1. t0= LBH/Q
2. t0= LB/HQ
3. t0= Q/LBH
4. t0= HQ/LB
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Question 57 : In which settling type, dilute suspension of particles takes place?
1. Zone settling
2. Compression settling
3. Hindered settling
4. Discrete settling
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Question 58 : What is the normal value of the detention period adopted in a flocculator for design purpose?
1. 30min
2. 60min
3. 90min
4. 100min
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Question 59 : The design value of surface loading for horizontal flow circular sedimentation is
1. 30-40m³/m²/d
2. 20-30m³/m²/d
3. 10-20m³/m²/d
4. 50-100m³/m²/d
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Question 60 : The chemical composition of Chlorinated Copperas is
1. Fe₂ (SO₄)₃ + FeCl₃
2. FeSO₄.9H₂O
3. FeSO₄.18H₂O
4. Fe₂ (SO₄)₃
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