Water Supply Engineering

191. Sluice valves are fitted in a distribution system

1. Along straight length of pipes at suitable intervals
2. At the junctions of the pipes
3. At the branching off points of sub-mains
4. All the above

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192. Sluice valves in main water supplies

1. Are used to regulate the flow of water in pipes
2. Are spaced about 5 km apart
3. Are usually placed at the summits
4. All the above

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193. Specific capacity or yield of wells, is generally expressed, as

1. m³ per sec
2. m³/hour
3. m³/hour/m²
4. m³/hour/m²/m

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194. Specific yield of a well is

1. Quantity of water than can be drawn from the well
2. Flow of water per unit time
3. Total quantity of water available in the well
4. Quantity of water per unit time per unit draw-down

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195. Standard process of chlorination of water, is done by

1. Plain chlorination
2. Pre-chlorination
3. Post-chlorination
4. Double chlorination

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196. Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided

1. Silica
2. Mud
3. Clay
4. Organic matter

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197. Steel pipe are

1. Suitable for withstanding high internal pressure
2. Connected by riveted or welded joints
3. Generally laid underground and no expansion joint is required
4. Likely to last 100 years under ordinary conditions

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198. Suction lift of a pump depends upon

1. Atmospheric pressure
2. Water temperature
3. Velocity of water in suction pipe
4. All the above

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199. Sunlight

1. Helps growth of bacterias
2. Impedes growth of algae
3. Increases dissolved oxygen content
4. Reduces turbidity

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200. Surcharge storage zone of a reservoir, is

1. Below dead storage
2. Between dead storage and useful storage
3. Above useful storage
4. Also known as valley storage

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