Water Supply Engineering

131. In the equation P = P_S/[1 + log_e^-1 (nt)] of a logistic curve of population growth, the constant m is

1. P_s × P
2. P_s/P
3. (P_s - P_o)/P_o
4. KP_s

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132. Increase in population of a rapidly growing city, may be estimated by

1. Arithmetical mean method
2. Geometrical method
3. Incremental increase method
4. Graphical comparison method

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133. Low turbidity of water is detected by

1. Turbidity tube
2. Jackson turbidity meter
3. Baylis turbidimeter
4. Hellige turbidimeter

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134. m and n are monsoon duration factor and catchment factor respectively. If P is yearly rainfall in cm, runoff can be calculated by

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

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135. Manholes along the mains from the source to a city are provided at 500 m intervals in

1. Steel pipes
2. R.C.C. pipes
3. Hume steel pipes
4. All the above

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136. Manholes are less common in

1. Cast iron pipes
2. Steel pipes
3. Hume steel pipes
4. R.C.C. pipes

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137. Mathamoglobinemia or blue baby disease is caused due to

1. Chlorides
2. Nitrites
3. Nitrates
4. Sulphides

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138. Maximum permissible colour for domestic water supplies, based on Cobalt scale, is

1. 5 P.P.M.
2. 10 P.P.M.
3. 15 P.P.M.
4. 20 P.P.M.

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139. Maximum threshold number permitted for indicating the odour of public water supplies, is

1. 1
2. 2
3. 3
4. 4

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140. Most commonly used pump for lifting water in water supply mains, is

1. Axial flow pump
2. Reciprocating pump
3. Rotary type pump
4. Centrifugal pumps

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