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Civil Engineering Objective Questions { Environmental Engineering }

197. The maximum diameter of sewers adopted in the designs is
A. 1.0 m
B. 2.0 m
C. 3.0 m
D. 4.0 m.
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198. The minimum diameter of sewer to be adopted is
A. 10 cm
B. 12.5 cm
C. 15 cm
D. 25 cm.
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199.  The rational formula for peak drainage discharge, was evolved by
A. Fruhling
B. Lloyd David
C. Kuichling
D. All of these.
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200. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hours.
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201.  If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula V = -n r213 s ? evolved by
A. Chezy
B. Manning
C. Bazin
D. Kutter.
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202. Pick up the correct statement from the following :
A. the sewer pipes of sizes less than 0.4 m diameter are designed as running full at maximum discharge
B. the sewer pipes of sizes greater than 0.4 m diameter are designed as running 2/3rd or 3/4th full at maximum discharge
C. the minimum design velocity of sewer pipes is taken as 0.8 m/sec
D. all the above.
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203.  In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time
A. 100 mm dia.
B. 150 mm dia.
C. 225 mm dia.
D. all of these.
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