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Environmental Engineering - Interview Questions and Answers

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86. Orthotolidine test is used for determination of
A. dissolved oxygen
B. residual chlorine
C. biochemical oxygen demand
D. dose of coagulant
Explanation:
87. The velocity of flow of water in a sedimentation tank is about
A. 5 to 10 cm/sec.
B. 15 to 30 cm/sec.
C. 15 to 30 cm/minute
D. 15 to 30 cm/hour
Explanation:
88. On standard silica scale, the turbidity in drinking water should be limited to
A. 10 ppm
B. 20 ppm
C. 30 ppm
D. 50 ppm
Explanation:
89. The distribution mains are designed for
A. maximum daily demand
B. maximum hourly demand
C. average daily demand
D. maximum hourly demand on maximum day
Explanation:
90. The major disadvantage of lime soda process of water softening is that
A. it is unsuitable for turbid and acidic water
B. huge amount of precipitate is formed which creates a disposal problem
C. the effluent cannot be reduced to zero hardness
D. it is unsuitable for softening the water of excessive hardness
Explanation:
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