Question 1 : How many types of sedimentation tanks are there on the basis of method of operation?
1. 2
2. 3
3. 4
4. 5
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Question 2 : _________ is the average of velocities at a point over a definite period of time.
1. Mean velocity
2. Relative velocity
3. Velocity gradient
4. Temporal mean velocity
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Question 3 : Which of the following represents the impeller shaft?
1. F
2. E
3. C
4. B
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Question 4 : What is the settling velocity of the particle in the wastewater if its diameter is 2 * 10^-3cm. Given G=2.65, viscosity v=8 * 10^-3cm²/Sec?
1. 0.01cm/Sec
2. 0.13cm/Sec
3. 0.24cm/Sec
4. 0.36cm/Sec
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Question 5 : In the expression vS = 1.8 (g*d (G-1)) ^1/2, the diameter of spherical particle is
1. 0.1mm
2. < 0.1mm
3. 1mm
4. >1mm
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Question 6 : 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 7 : The detention period for a sedimentation tank where coagulation takes place is
1. 30 seconds
2. 1 minute
3. 1hour
4. 2hour
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Question 8 : The speed of impeller in a flash mixer is
1. 45rpm
2. 60rpm
3. 110rpm
4. 200rpm
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Question 9 : The overflow rate for a plain sedimentation tank is ______ litre/day/metre².
1. 50000
2. 40000
3. 12000
4. 30000
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Question 10 : Which of the following is the correct expression regarding temporal mean velocity?
1. G = (P/μV) ^1/2
2. G = (P/μV)
3. G = (P/μV) ²
4. G = (Pμ/V) ^1/2
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