Hydrology and Ground Water

151. The main function of a divide wall is to

1. Control the silt entry in the canal
2. Prevent river floods from entering the canal
3. Separate the under-sluices from weir proper
4. Provide smooth flow at sufficiently low velocity

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152. The major resisting force in a gravity dam is

1. Water pressure
2. Wave pressure
3. Self-weight of dam
4. Uplift pressure

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153. The maximum average depth due to one day storm over an area of 100 km² is 100 mm. Depth- Area-Duration (DAD) curves indicate the same area of 100 km² the maximum average depth for a 3 hour storm will be

1. 100 mm
2. More than 100 mm
3. Less than 100 mm
4. None of the above

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154. The maximum permissible eccentricity for no tension at the base of a gravity dam is

1. B/2
2. B/3
3. B/4
4. B/6

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155. The meander pattern of a river is developed by

1. Average discharge
2. Dominant discharge
3. Maximum discharge
4. Critical discharge

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156. The minimum size of stone what will remain at rest in a channel of longitidinal slope 'S' and hydraulic mean depth 'R' is given by

1. 4 RS
2. 11 RS
3. 7 RS
4. 15 RS

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157. The most suitable chemical which can be applied to the water surface for reducing evaporation is

1. Methyl alcohol
2. Ethyl alcohol
3. Cetyl alcohol
4. Butyl alcohol

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158. The most suitable material for the central impervious core of a zoned embankment type dam is

1. Clay
2. Coarse sand
3. Silty clay
4. Clay mixed with fine sand

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159. The net head under which the turbine reaches its peak efficiency at synchronous speed is called

1. Design head
2. Rated head
3. Gross head
4. Operating head

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160. The net speed under which the turbine reaches its peak efficiency is called

1. Design speed
2. Rated speed
3. Gross speed
4. Operating speed

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