Question 11 : In which type of settling, sedimentation of discrete particles takes place?
1. Zone settling
2. Compression settling
3. Hindered settling
4. Discrete settling
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Question 12 : 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 13 : How many types of settling are there in sedimentation tank?
1. 3
2. 4
3. 5
4. 6
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Question 14 : In which type of settling, settling of particles takes place by the contact of impurities with each other present in wastewater?
1. Flocculent settling
2. Hindered settling
3. Compression settling
4. Discrete settling
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Question 15 : Which of the following goes to the flocculation tank?
1. B
2. C
3. E
4. F
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Question 16 : Which of the following represents the device which is used for sludge removal?
1. F
2. E
3. D
4. B
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Question 17 : In a rectangular horizontal flow tank, the maximum permissible velocity is ____ m/Sec.
1. 3
2. 0.3
3. 0.03
4. 0.003
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Question 18 : Which of the following cannot be the velocity of flow in the horizontal flow sedimentation tank?
1. 12cm/min
2. 39cm/min
3. 5cm/min
4. 20cm/min
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Question 19 : 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 20 : _______ is formed when alum is added to sewage.
1. Acid
2. Floc
3. Salt
4. Base
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