waste water engineering MCQs – Page 13

Practise focused waste water engineering questions with marked answers for exam preparation and subject revision.

waste water engineering Mcqs

241. The effluent of a septic tank is_________________?
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A. None of these

B. Foul and contains dissolved and suspended solids

C. Fit for discharge into any open drain

D. As good as that from a complete treatment

242. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is________________?
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A. 15 cm

B. 18 cm

C. 12 cm

D. 10 cm

243. The settlement of a particle in sedimentation tank, is affected by_____________________?
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A. All the above

B. Velocity of flow

C. Size and shape of solid

D. Viscosity of water

244. In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is_______________?
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A. None of these

B. Combined system

C. Separate system

D. Partially combined system

245. In case of sewer lines_________________?
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A. Obstruction test is carried out with the help of smooth ball of diameter 13 mm

B. Water test is carried out to check water tightness of the joints

C. Test for straightness is carried out with the help of a lamp and mirror

D. All the above

246. If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is__________________?
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A. 1.69 m

B. 1.39 m

C. 1.59 m

D. 1.49 m

247. Fresh sewage is generally_____________________?
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A. Acidic

B. Alkaline

C. A source of objectionable odour

D. Highly decomposed

248. The ratio of maximum sewage flow to average sewage flow for trunk mains having diameters more than 1.25 m, is____________________?
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A. 4

B. 3

C. 1.5

D. 2

249. For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by______________?
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A. Frubling

B. Kinchling

C. All the above

D. Lloyd Davis

250. In septic tanks, decomposition of organic bacteria, is done by_____________________?
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A. Anaerobic bacteria

B. Aerobic bacteria

C. Both types of bacterias

D. None of these

251. If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is____________________ ?
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A. 3-Jan

B. 0/2

C. 2 /3

D. 0/3

252. Stone ware pipes are_______________?
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A. Highly resistant to sulphide corrosion

B. Especially suited to pressure pipes

C. Highly impervious

D. Hydraulically efficient because of their smooth interior surface

253. A drop manhole is provided if__________________?
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A. None of these

B. A sewer drops from a height

C. A lamp is inserted to check obstruction

D. A branch sewer joins the main sewer at higher level

254. The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is_______________?
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A. 25%

B. 50 %

C. 5%

D. 10%

255. The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Mannings formula, is given by______________________?
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A. Kutter

B. William-Hazen

C. Crimp and Bruges

D. Bazin

256. For large sewers, maximum distance between manholes may be_______________?
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A. 300 m

B. 100 m

C. 50 m

D. 200 m

257. The sewage is pumped up_______________?
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A. From low lying areas

B. From flat areas

C. All the above

D. From basements

258. The value of Chezys constant C = 157.6/(1.81 + K/ ) is used in__________________?
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A. Chezys formula

B. Kutters formula

C. Bazins formula

D. Mannings formula

259. The use of coarse screens for the disposal of sewage, may be dispensed with by______________?
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A. Comminutor

B. Shredder

C. Both A. and B.

D. Neither A. nor B.

260. Facultative bacteria survive in_____________________?
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A. The presence of oxygen

B. The absence of oxygen

C. Both cases A. and B.

D. Neither A. nor B.

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