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Water Supply Engineering MCQ

Pick up the incorrect statement from the following regarding fire hydrants

Answer

Correct Answer: None of these.

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The specific retention is least in case of

Answer

Correct Answer: Coarse gravel.

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In slow sland filters, the turbidity of raw water can be removed only up to

Answer

Correct Answer: 60 mg/litre

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The maximum depth of sedimentation tanks is limited to

Answer

Correct Answer: 6 m.

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Water supply system includes

Answer

Correct Answer: Entire arrangement from source to distribution.

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Aeration of water is done to remove

Answer

Correct Answer: Odour

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Pick up the correct statement from the following:

Answer

Correct Answer: Excess quantities of iron and manganese in water, cause discolouration of clothes

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By boiling water, hardness can be removed if it is due to

Answer

Correct Answer: Calcium bicarbonate

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The transitional middle portion of a logistic curve follows

Answer

Correct Answer: A constant rate.

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Economic height of a dam is the height corresponding to which

Answer

Correct Answer: Cost of the dam per unit of storage is minimum

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The least thickness of class B cast iron (spun) pipe, is

Answer

Correct Answer: 8.6 mm

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Biochemical Oxygen Demand (B.O.D.) of safe drinking water must be

Answer

Correct Answer: Nil

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Turbidity of raw water is a measure of

Answer

Correct Answer: Suspended solids

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

Answer

Correct Answer: Steel pipes

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If four fires break out in a city of population 40 lakhs and if each hydrant has three streams and duration of each fire is four hours, the total quantity of water required, is

Answer

Correct Answer: 2880 kilo litres

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Corrosion of well pipes may not be reduced by

Answer

Correct Answer: Using screens having larger area of openings

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Water supply includes

Answer

Correct Answer: Collection, transportation and treatment of water

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Average annual rainfall at any station is the average of annual rainfall over a period of

Answer

Correct Answer: 35 years.

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Time of concentration

Answer

Correct Answer: Time taken for the storm water to travel from the most remote point to the drain.

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Acidity in water is caused due to

Answer

Correct Answer: Mineral acids

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