Water Supply Engineering

141. Most commonly used section in grade aqueducts, is

1. Circular
2. Rectangular
3. Parabolic
4. Horse shoe section

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142. Most important method for calculating discharge for planning a water supply project, is

1. Velocity area method
2. Weir or spillway method
3. Use of venturi-meter
4. Using power plant consumption

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143. Most important source of water for public water supply, is from

1. Lakes
2. Ponds
3. Streams
4. Rivers

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144. Most satisfactory formula for an estimate of fire demand Q for a city of population P in thousands for Indian conditions, is

1. Q = 1115 (p/5 + 20)
2. Q = 1640 √P (1 - 0.01 √P)
3. Q = 3180 √P
4. None of these

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145. Mostly used coagulant, is

1. Chlorine
2. Alum
3. Lime
4. Bleaching powder

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146. Mud balls may be removed by

1. Breaking and washing
2. Washing the filter with a solution of caustic soda
3. Removing, cleaning and replacing the damaged sand
4. All the above

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147. Non-pathogenic bacterias cause the following water borne disease,

1. Cholera
2. Typhoid
3. Infections hepatitis
4. None of these

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148. Normal values of overflow rate for plain sedimentation tank using coagulants, is

1. 750 to 1000 litres/hr/m²
2. 1000 to 1250 litres/hr/m²
3. 1250 to 1500 litres/hr/m²
4. 1500 litres/hr/m²

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149. Normal values of overflow rate for plain sedimentation tank, is

1. 250 to 500 litres/hr/m²
2. 500 to 750 litres/hr/m²
3. 750 to 1000 litres/hr/m²
4. 1000 to 1250 litres/hr/m²

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150. Normal values of overflow rate for plain sedimentation tanks in litres/hr/m², generally range between

1. 100 to 250
2. 250 to 500
3. 500 to 750
4. 750 to 1000

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