Water Supply Engineering

This is an MCQ-based quiz on Water Supply Engineering.

This includes Kuichling’s formula, Freeman formula, Bustan’s formula, Mineral acids, Free CO₂, and Aluminium sulphate.

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

nil 5 10 15

For determining the velocity of flow of underground water, the most commonly used non-empirical formula is

Darcy’s formula Slichter’s formula Hazen’s formula Lacy’s formula

Specific capacity or yield of wells, is generally expressed, as

m³/sec m³/hour m³/hour/m² m³/hour/m²/m

The yield of a rapid gravity filter as compared to that of slow sand filter, is

10 times 15 times 20 times 30 times

If the chosen diameter of a pipe, is less than the economical diameter

Cost of pipe will be less Head loss will be high Cost of pumping will be more than saving All the above

Turbidity of raw water is a measure of

Suspended solids Acidity of water B.O.D None of these

The expected discharge to be obtained from an open well sunk in coarse sand is 0.0059 cumec. If the working depression head of the well is 3 m, the minimum diameter of the well, is

2 m 2.25 m 2.50 m 3.00 m

What is the most commonly used pump for lifting water in water supply mains?

Rotary type pump Axial flow pump Centrifugal pumps None of the above

What does water supply system include?

Construction of dams Digging a well for water Construction of dams Entire arrangement from source to distribution.

Percussion drilling is unsuitable in .......

Quick sand Unconsolidated sand Consolidated rocks Unconsolidated gravel

Disinfection of water with ozone is not good because ...........

It adds taste to the water It vanishes before water reaches the consumers It vanishes before water reaches the consumers it is more efficient than chlorine in killing bacterias

The efficiency of sedimentation tank does not depend upon

Length of tank Depth of tank Detention period Velocity of water

How much is the diameter of pipes in bathrooms and lavatories in the domestic water supply?

18 mm 12 mm 16 mm 14 mm

What is the economic diameter of the pipe, If the discharge of a pump is 0.16 cumecs?

4.88 m 48.8 cm 0.488 m None of the above

Air binding is caused due to excessive ........ in a rapid sand filter.

Pressure Turbidity Water pressure Negative pressure

Disinfection of drinking water, is done to remove

Odour

Bacterias

Turbidity