A. Width of the tank is normally kept about 6 m
B. Length of the tank is normally kept 4 to 5 times the width
C. Maximum horizontal flow velocity is limited to 0.3 m/minute
D. All the above
Related Mcqs:
- In septic tanks__________________?
A. Free board of 0.3 m may be provided
B. The baffles or tees are extended up to top level of scum
C. The clear space between the baffle top and covering slab is about 7.5 cm
D. All the above - The normal values of over flow rates for secondary sedimentation tanks, ranges between__________________?
A. 25,000 to 35,000 litres/sqm/day
B. 40,000 to 50,000 litres/sqm/day
C. 50,000 to 60,000 litres/sqm/day
D. 80,000 to 10,000 litres/sqm/day - The normal value of over flow rates for plain primary sedimentation tanks, ranges between________________?
A. 25,000 to 35,000 litres/sqm/day
B. 40,000 to 50,000 litres/sqm/day
C. 50,000 to 60,000 litres/sqm/day
D. 80,000 to 100,000 litres/sqm/day - The normal values of over flow rates for sedimentation tanks using coagulant, ranges between__________________?
A. 25,000 to 35,000 litres/sqm/day
B. 40,000 to 50,000 litres/sqm/day
C. 50,000 to 60,000 litres/sqm/day
D. 80,000 to 100,000 litres/sqm/day - The detention period for plain sedimentation water tanks, is usually____________________?
A. 4 to 8 hours
B. 8 to 16 hours
C. 16 to 24 hours
D. 24 to 36 hours - In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is_________________?
A. 2.25
B. 2.50
C. 2.55
D. 2.65 - The settlement of a particle in sedimentation tank, is affected by_____________________?
A. Velocity of flow
B. Viscosity of water
C. Size and shape of solid
D. All the above - The maximum depth of sedimentation tanks, is kept__________________?
A. 3 m
B. 3.5 m
C. 4 m
D. 4.5 m - In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is____________________?
A. Q/(B × D)
B. Q/(L × D)
C. Q/L
D. Q/(B × L) - The discharge per unit plan area of a sedimentation tank, is generally called________________?
A. Over flow rate
B. Surface loading
C. Over flow velocity
D. All the above
