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Civil Engineering Objective Questions { Environmental Engineering }

260. The quantity of liquid waste which flows in sewers during the period of rainfall, is known
A. sanitary sewage
B. industrial waste
C. storm sewage
D. none of these.
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261.  A rain sanitary sewer is constructed to carry
A. sanitary sewage
B. storm sewage
C. surface water
D. ground water
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262. The sewer which collects the discharge from a collecting System and delivers it to a treatment plant, is known
A. house sewer
B. lateral sewer
C.A branch sewer
D. sewer outfall.
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263. The sewer which received discharge from two or more main sewers, is known as
A. a trunk sewer
B. an outfall sewer
C. a main sewer
D. an intercepting sewer.
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264.  Rate of flow of sewage is generally assumed
A. more than the rate of water supply
B. equal to the rate of water supply
C. less than the rate of water supply
D. at 150 litres per capita.
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265.  To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
A. 0.50 m/sec
B. 0.60 in/sec
C. 0.70 m/sec
D. 0.75 m/sec
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266. Pick up the correct statement from the following :
A. The larger the sewer in size, more.will be velocity
B. The smaller the sewer in size, less will be velocity
C. The larger the sewer in size, no deposition will take place
D. The larger the sewer in size, deposition will take place.
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