waste water engineering MCQs – Page 11

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

waste water engineering Mcqs

201. The pH value of sewage is determined with the help of_________________?
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A. Imhoff Cone

B. Potentiometer

C. None of these

D. Turbid meter

202. For trunk sewers more than 1.25 m in diameter, the ratio of the maximum daily sewage flow to the average daily sewage flow is assumed________________?
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A. 2

B. 2.5

C. 1.5

D. 3

203. The pH value of fresh sewage is usually ______________________?
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A. Equal to zero

B. Equal to 7

C. More than 7

D. Less than 7

204. Which one of the following part of human body withstands minimum radiation ?
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A. Kidneys

B. Thyroid

C. Ovaries/testis

D. Eyes

205. The asbestos cement pipes are generally laid___________________?
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A. At an angle of 30

B. At an angle of 60

C. Vertically

D. Horizontally

206. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is_____________________?
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A. 0.30 m/sec

B. 0.40 m/sec

C. 0.35 m/sec

D. 0.45 m/sec

207. The first stage of neutral process of sludge digestion, is__________________?
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A. Acid fermentation

B. None of these

C. Acid regressio

D. Alkaline fermentation

208. In sewage having fully oxidised organic matter, the nitrogen exists in the form of________________?
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A. Aluminoid nitrogen

B. Nitrates

C. Free ammonia

D. Nitrites

209. The rate of accumulation of sludge per person per year, is_______________________?
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A. 15 litres

B. 20 litres

C. 10 litres

D. 25 litres

210. weight of water, the hydraulic mean depth of the sewer and the bed slope w is the unit of the sewer, then the tractive force exerted by flowing water, is________________________?
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A. w r S S

B. w r1/2

C. w r S

D. w r2/3

211. The digested sludge from septic tanks, is removed after a maximum period of__________________?
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A. 3 years

B. 4 years

C. 5 years

D. 3.5 years

212. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is____________________?
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A. Cast iron sewers

B. Glazed bricks sewers

C. Stone ware sewers

D. Cement concrete sewers

213. The design period in years for pumping plants, is___________________?
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A. 5 to 10

B. 3 to 5

C. 2 to 3

D. 1

214. Boussinesqs equation for ascertaining unit pressure at a depth on sewers due to traffic loads, is__________________?
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A. pt = 2 3p/3Z5

B. pt = 3H3p/2Z5

C. pt = 3H3p/2 Z5

D. pt = 2H3p/3 Z5

215. If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is___________________?
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A. 2 hours

B. 4 hours

C. 6 hours

D. 8 hours

216. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120, the depth of sewerage is________________________?
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A. 25 cm

B. 40 cm

C. 20 cm

D. 50 cm

217. As compared to fresh river water, sea water contains oxygen_________________?
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A. 10% less

B. 20% more

C. 20% less

D. 10% more

218. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at___________________?
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A. Three fourth full

B. Full depth

C. Half full

D. Two third full

219. Kjeldahl nitrogen is a mixture of___________________?
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A. All the above

B. Ammonia and nitrogen

C. Nitrogen and organic nitrogen

D. Organic nitrogen and ammonia

220. Assertion A. : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities_________________?
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A. Both A and R are true and R is the correct explanation of A

B. Both A and R are true but R is not a correct explanation of A

C. A is true but R is false

D. A is false but R is true

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