waste water engineering MCQs – Page 9

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

waste water engineering Mcqs

161. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept________________?
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A. 10

B. 2

C. 0.25

D. 5

162. Pick up the correct statement from the following ?
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A. The larger the sewer in size, no deposition will take place

B. The smaller the sewer in size, less will be velocity

C. The larger the sewer in size, more will be velocity

D. The larger the sewer in size, deposition will take place

163. In sewers the highest non-scouring velocity is achieved in________________?
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A. Cast iron sewers

B. Stone ware sewers

C. Cement concrete sewers

D. Glazed bricks sewers

164. The sewer which resists sulphide corrosion, is____________________?
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A. Cast iron sewer

B. Lead sewer

C. Brick sewer

D. R.C.C. sewer

165. The detention period for plain sedimentation water tanks, is usually____________________?
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A. 24 to 36 hours

B. 8 to 16 hours

C. 16 to 24 hours

D. 4 to 8 hours

166. The suitable cross-section of sewers to carry combined flow, is__________________?
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A. Circular

B. Rectangular

C. Horse shoe shaped

D. Egg shaped

167. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of__________________?
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A. Degradation

B. Cleaner water

C. Recovery

D. Active decomposition

168. Hume steel pipes are__________________?
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A. Steel pipes

B. Steel shell coated from inside with cement mortar

C. Steel shell coated from outside with cement mortar

D. Both B. and C.

169. If is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is___________________?
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A. 1.25 D

B. 1.5 D

C. 1.75 D

D. D

170. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is____________________?
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A. 100 cm

B. 150 cm

C. 120 cm

D. 110 cm

171. The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stocks law, is__________________?
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A. Vs = 218 (Gs Gw)d [(3T + 70)/100]

B. Vs = 418 (Gs Gw)d [(3T + 70)/100]

C. Vs = 218 (Gs Gw)d [(3T + 70)/100]

D. Vs = 418 (Gs Gw) d [(3T + 70)/100]

172. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is_________________?
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A. 2.25

B. 2.65

C. 2.5

D. 2.55

173. Drop manholes at the junctions of sewer lines, are provided if________________?
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A. Two sewer lines intersect

B. Invert level of a branch sewer is more than 60 cm that of the main sewer

C. Ordinary manhole cannot be built

D. Sewer line runs along a main road

174. Which one of the following tests is used for testing sewer pipes ?
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A. Water test

B. All of these

C. Mirror test

D. Ball test

175. In sewage, the solids in mg per litre is__________________?
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A. 1500 to 2000

B. 1000 to 1500

C. 500 to 1000

D. 100 to 500

176. Pick up the in-correct statement from the following?
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A. Inlets are generally provided in all sewers

B. Catch basins are generally provided in sewers for carrying drainage discharge

C. Manholes are provided in sewer pipes at suitable intervals

D. None of these

177. Maximum permissible velocity 1.5 m/sec, is adopted in drains_______________________?
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A. With beds of rocks and gravels

B. Lined with stones

C. Both A. and B.

D. Neither A. nor B.

178. The sewer pipe which carries sewage from a building for immediate disposal is______________?
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A. Main sewer

B. Intercepting sewer

C. House sewer

D. Lateral sewer

179. Which one of the following resists hydrogen sulphide corrosion ?
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A. Glazed stone wares

B. Asbestos cement

C. R.C.C.

D. Glazed ware

180. The minimum diameter of sewer to be adopted is_________________?
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A. 25 cm

B. 15 cm

C. 12.5 cm

D. 10 cm

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