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Civil Engineering Objective Questions { Environmental Engineering }



36.  If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is
A. 1 in 60
B. 1 in 100
C. 1 in 120
D. none of these.
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37.  If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is
A. 1 in 60
B. 1 in 100
C. 1 in 120
D. none of these.
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38.  If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
A. 1 in 60
B. 1 in 100
C. 1 in 120
D. none of these.
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39. In sewers the effect of scouring is more on
A. top side
B. bottom side
C. horizontal side
D. all sides.
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40. For non-scouring velocity 5 in/sec, the type of sewers generally preferred to, is
A. cast iron sewers
B. cement concrete sewers
C. glazed bricks sewers
D. stone ware sewers.
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41. In sewers the highest non-scouring velocity is achieved in
A. glazed bricks sewers
B. cast iron sewers
C. cement concrete sewers
D. stone ware sewers.
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42.  Cement concrete sewers are only suitable if non-scouring velocity is between
A. 2.5 to 3.0 in/sec
B. 3.0 tO 4.0 m/sec
C. 3.5 to 4.5 rn/sec
D. 4.5 to 5.5 m/sec.
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