Waste Water Engineering

261. The sewer pipes

1. Carry sewage as gravity conduits
2. Are designed for generating self-cleansing velocities at different discharge
3. Should resist the wear and tear caused due to abrasion
4. All the above

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262. The sewer that unloads the sewage at the point of treatment is called

1. Main sewer
2. Outfall sewer
3. Branch sewer
4. House sewer

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263. The sewer which collects the discharge from a collecting system and delivers it to a treatment plant, is known

1. House sewer
2. Lateral sewer
3. Branch sewer
4. Sewer outfall

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264. The sewer which received discharge from two or more main sewers, is known as

1. A trunk sewer
2. An outfall sewer
3. A main sewer
4. An intercepting sewer

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265. The sewer which resists sulphide corrosion, is

1. Brick sewer
2. Cast iron sewer
3. R.C.C. sewer
4. Lead sewer

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266. The sewer which transports the sewage to the point of treatment, is called

1. House sewer
2. Out-fall sewer
3. Branch sewer
4. Main sewer

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267. The sewerage system consists of

1. House sewer
2. Lateral sewer
3. Branch sewer
4. All of these

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268. The sewerage system originates from

1. House sewers
2. Lateral sewers
3. Branch sewers
4. Main sewers

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269. The sewers

1. Must be of adequate size to avoid over flow
2. Must flow under gravity ½ to ¾ full
3. Must be laid at least 2 to 3 m deep to collect /water from the basements
4. All the above

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270. The sludge does not contain waste water from

1. Bath rooms
2. Wash basins
3. Kitchen sinks
4. Toilets

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