Water Supply Engineering

161. Pick up the correct statement from the following regarding the pressure conduits:

1. Pressure conduits are permitted to run ¾th full
2. Pressure conduits are always laid along down grades
3. The hydraulic gradient line always coincides the invert of the conduit
4. None of these

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162. Pick up the correct statement from the following:

1. The water level in a still well, represents the ground water table level
2. The difference between water table level and the water level in a well after pumping, is called depression head
3. The surface of water table surrounding a well during pumping, forms a cone of depression
4. All the above

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163. Pick up the incorrect statement from the following regarding fire hydrants

1. Fire hydrants are fitted in water mains at 100 m to 150 m apart at fire
2. The minimum water pressure hydrants, is kept 1.5 kg/cm²
3. The water at pressure 1 to 1.5 kg/cm² is made available for 4 to 5 hours for constant use
4. None of these

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164. Pick up the incorrect statement from the following. Intake of water supply should

1. Be nearer to the treatment plant
2. Receive water from purer zone of the source
3. Be located downstream of waste water disposal point
4. Remain easily accessible during floods

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165. Pick up the incorrect statement from the following. The source of surface water is from

1. Streams and rivers
2. Storage reservoirs
3. Springs
4. Ponds and lakes

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166. Pick up the incorrect statement from the following. The underground sources of water, is from

1. Wells
2. Springs
3. Infiltration wells
4. Storage reservoirs

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167. Pick up the incorrect statement from the following:

1. The pH value of water indicates the logarithm of reciprocal of hydrogen ion concentration in water
2. Higher value of pH means lower hydrogen ion concentration
3. Lower value of pH means higher hydrogen ion contraction
4. Lower value of pH gives alkaline solution

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168. Pick up the wrong nominal internal diameter of cast iron (spun) pipes in mm from the following:

1. 300
2. 400
3. 550
4. 650

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169. Pickup the incorrect statement from the following:

1. The invert of pressure conduit is independent of the grade of the hydraulic gradient line
2. The pressure conduits may be taken uphill upto a maximum height of 8.3 m
3. Aqueducts and tunnels sections are generally kept circular
4. None of these

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170. Pipes are laid parallel

1. To increase the capacity of the water supply
2. To provide a means of repairing without closing water supply
3. To meet the requirement of excessive supply
4. All the above

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