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Environmental Engineering - Interview Questions and Answers

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141. The slope of sewer shall be
A. given in the direction of natural slope of ground
B. given in the direction opposite to natural slope of ground
C. zero
D. steeper than 1 in 20
Explanation:
142. The self cleansing velocity for all sewers in India is usually
A. less than 1.0 m/sec
B. 1.0 m/sec to 1.2 m/sec
C. 1.5 m/sec to 2.0 m/sec
D. 3.0 m/sec to 3.5 m/sec
Explanation:
143. Settling velocity increases with
A. specific gravity of solid particles
B. size of particles
C. depth of tank
D. temperature of liquid
Explanation:
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