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Environmental Engineering - Interview Questions and Answers

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106. Disinfection efficiency is
A. reduced at higher pH value of water
B. unaffected by pH value of water
C. increased at higher pH value of water
D. highest at pH value equal to 7
Explanation:
107. Activated carbon is used for
A. disinfection
B. removing hardness
C. removing odours
D. removing corrosiveness
Explanation:
108. The layout of distribution system in which water flows towards the outer periphery is
A. ring system
B. dead end system
C. radial system
D. grid iron system
Explanation:
109. The disinfection efficiency of chlorine increases by i) decreasing the time of contact ii) decreasing the temperature of water iii) increasing the temperature of water The correct answer is
A. only (i)
B. both (i) and (ii)
C. both (i) and (iii)
D. only (iii)
Explanation:
110. The suitable layout of distribution system for a city with roads of rectangular pattern is
A. grid iron system
B. dead end system
C. ring system
D. radial system
Explanation:
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