Water Supply Engineering

181. Raw water treated with only chlorine, is known as

1. Plain chlorination
2. Pre-chlorination
3. First-chlorination
4. De-chlorination

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182. Reciprocating pumps

1. Are not suitable for variable heads
2. Are four times costlier than centrifugal pumps
3. Are not suitable for pumping water containing sediments
4. Single stroke produce pulsating flow

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183. Recuperation test is carried out to determine

1. Turbidity of water
2. pH value of water
3. Yield of well
4. Discharge from a well

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184. Runoff is the quantity of water which flows

1. In sewer pipes
2. Due to leakage in pipes
3. In rivers
4. None of these

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185. S₁ and S₂ are the draw downs in an observation well at times t₁ and t₂ after pumping. For discharge Q and coefficient of transmissibility T, the relationship, is

1. S₂ - S₁ = (2.3Q/πT) log10 (t₂/t₁)
2. S₂ - S₁ = (2.3Q/4πT) log10 (t₂/t₁)
3. S₂ - S₁ = (2.3Q/4πT) loge (t₂/t₁)
4. S₂ - S₁ = (2.3Q/4πT) loge (t₁/t₁)

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186. Service connections to consumers houses, are generally provided with

1. Copper pipes
2. Hume pipes
3. Galvanised iron pipes
4. P.V.C. pipes

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187. Shales are

1. Porous
2. Permeable
3. Porous and permeable
4. Porous but not permeable

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188. 'Shrouding' is essentially provided in

1. Strainer type wells
2. Cavity type wells
3. Slotted type well
4. All the above

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189. Silt storage is the same as

1. Dead storage
2. Live storage
3. Effective storage
4. None of these

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190. Slow sand filter is used if maximum turbidity of raw water is less than

1. 10 gm/litre
2. 20 gm/litre
3. 30 gm/litre
4. 50 gm/litre

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