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Environmental Engineering - Interview Questions and Answers

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76. For a given discharge, the efficiency of sedimentation tank can be increased by
A. increasing the depth of tank
B. decreasing the depth of tank
C. increasing the surface area of tank
D. decreasing the surface area of tank
Explanation:
77. As compared to rapid sand filters, slow sand filters give i) slower filtration rate ii) higher filtration rate iii) lesser efficiency in removal of bacteria iv) higher efficiency in removal of bacteria The correct answer is
A. (i) and (ii)
B. (ii) and (iii)
C. (i) and (iv)
D. (ii) and (iv)
Explanation:
78. Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the
A. hardness in water
B. turbidity in water
C. dissolved oxygen in water
D. residual chlorine in water
Explanation:
79. Residual chlorine in water is determined by
A. starch iodide method
B. orthotolidine method
C. both (a) and (b)
D. none of the above
Explanation:
80. The settling velocity of a particle in a sedimentation tank depends on
A. depth of tank
B. surface area of tank
C. both depth and surface area of tank
D. none of the above
Explanation:
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