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Environmental Engineering - Interview Questions and Answers

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66. The detention period and overflow rate respectively for plain sedimentation as compared to sedimentation with coagulation are generally
A. less and more
B. less and less
C. more and less
D. more and more
Explanation:
67. The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is
A. 9500
B. 9800
C. 10100
D. 10920
Explanation:
68. The alum, when added as a coagulant in water
A. does not require alkalinity in water for flocculation
B. does not affect pH value of water
C. increases pH value of water
D. decreases pH value of water
Explanation:
69. If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to
A. total alkalinity
B. total hardness
C. total hardness - total alkalinity
D. non carbonate hardness
Explanation:
70. The effective size of sand particles used in slow sand filters is
A. 0.25 to 0.35 mm
B. 0.35 to 0.60 mm
C. 0.60 to 1.00 mm
D. 1.00 to 1.80 mm
Explanation:
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