When the reduced level of the water source is higher than the reduced level of the consumer’s place, water is generally supplied

Surcharge storage zone of a reservoir, is

In pressure supply mains, water hammer pressure is reduced by providing

To pump water from a water reservoir 3 m deep and maximum water level at 135 m, a pump is installed to lift water up to R.L. 175 m at a constant rate of 36,00,000 litres per hour. If the length of the pipe is 1506 m and f = 0.01, ignoring other minor losses and assuming the economical diameter from Lea’s formula D = 1.2 VQ, the water horse power of the pump is

Turbidity of raw water is a measure of

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

Pick up the correct statement from the following:

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

Pick up the correct statement from the following:

In centrifugal pump installation,

While determining the yield of open wells by the pumping test

The process of passing water through beds of granular materials, is called

For the prediction of future population of a city, the factor to be considered, is

Mathamoglobinemia or blue baby disease is caused due to

To control the growth of algae in reservoirs, the compound which is used, is

The population of a city in 2000 is 50,000. The average increase in population over last 8 decades is 7500 and average incremental increase during 8 decades is 750. The population of the city based on incremental method, in the year 2020 will be

A pressure conduit laid underground, may not be subjected to

The bacterias which require free oxygen for their survival, are called

Gravity conduits are generally in the form of

The main disadvantage of hard water, is

The formula Q = P – K [1.8T + 32] in which Q is runoff, P is annual rain fall in cm, T is mean annual temperature in centigrade and K is a constant, is known

The bed slope in slow sand filters, is generally kept

The water level in an open well was depressed by pumping 2.5 m and recuperated 2.87 m in 3 hours and 50 minutes. The yield of the well per minute is

Perched aquifers are generally found

Pick up the incorrect statement from the following:

Mostly used coagulant, is

A centrifugal pump is required to be primed before starting if it is located

Suction lift of a pump depends upon

Shrouding’ is essentially provided in

The maximum permissible hardness for public supplies is

Time of concentration

The chlorine supply cylinders are generally kept at 38°C to 40°C to prevent

An earth formation which, although porous and capable of absorbing water does not provide an appreciable supply to wells, is known as

Property of earth to allow water to pass through it, is known as

Plain chlorination is used for water

A city supply includes

The pH value of water is kept slightly less than 7 so that hydrochloride ions may combine with ammonia ions to form

Pick up the correct statement from the following:

Pick up the correct statement from the following:

The difference in the reservoir level and the lowest point of the water mains is 180 m. The expected pressure due to water hammer is 7.5 kg/cm2 in a pressure conduit of diameter 1 m. Assuming the efficiency of the riveted joints of the pipe as 0.6 and minimum cover 3 mm for corrosion, the thickness of the pipe materials, is

Rapid gravity filters

For 3.25 x 10-2 cumecs discharging from a well, a pump is installed to lift water against a total head of 30 m. The minimum required horse power, is

Distribution mains of any water supply, is normally designed for its average daily requirement

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

The rate of silting in a reservoir

Corrosion of well pipes may not be reduced by

Recuperation test is carried out to determine

Pick up the correct statement from the following:

Pick up the incorrect statement from the following. The underground sources of water, is from

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

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Pickup the incorrect statement from the following:

Pick up the correct statement from the following:

Gravity conduits for carrying water from the source are

In a rapid sand filter, air binding is caused due to excessive

According to Godrich the ratio of peak demand rate to mean demand is

The best quality of filter material is obtained from quartzite if it does not loose weight when placed in hydrochloric acid for 24 hours, more than

Pick up the incorrect statement from the following:

The factor for the selection of pumping station site, is

One degree of hardness of water means a content of salts of

The U.C. (uniformity coefficient) D60/D10 for the best filter media sand should be

Manholes are less common in

For determining the velocity of flow of underground water, the most commonly used non­empirical formula is

The most commonly used chemical for de-chlorination of water, is

To remove very fine suspended particles from water, the method adopted is

Sunlight

The detention period for plain sedimentation water tanks, is usually

Air valves are generally provided in pressure pipes of water supply

Pick up the correct statement from the following regarding the pressure conduits:

Pick up the correct statement from the following:

The gaseous form of chlorine gets converted into liquid form when subjected to a pressure of

Flow through period, in sedimentation tanks, is

Turbidity of water may be caused due to

Pick up the incorrect statement from the following:

The maximum hourly consumption, is generally taken as

Hardness of water can be removed by boiling if it is due to

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

Hardness of water is caused by

Pick up the correct statement from the following:

Pick up the correct statement from the following:

Detention period of a settling tank is

The average domestic consumption under normal conditions in an Indian city per day per person, is

Generally, first portion of a logistic curve for the population growth of a developing city, represents the growth of

A pressure conduit carrying water beneath a stream or a canal, is known as

Permanent hardness of water can be removed by

Pick up the correct statement from the following:

The maximum depth of sedimentation tanks is limited to

Pick up the incorrect statement from the following. Intake of water supply should

Pick up the correct statement from the following:

The fire demand of a city may be worked out by

The formula HL = nzVzt/R4/3 for the head loss in conduits is generally known as

The joint used for joining the plain ends of cast iron pipes, is

Disinfection of water with ozone is not good because

The prescribed hardness limit of potable water ranges between

While designing a water supply of an industrial township, industrial and commercial water demand of total supply, is assumed

After cleaning a slow sand filter, the filtered water is not used for

The efficiency of sedimentation tank does not depend upon

Velocity of flow of water in plain sedimentation water tank, is normally kept

Hard water contains

The depth of the water table at a place is 45 m below the general ground level. To lift water from a deep tube well in such a locality, the type of pump to be installed is

In a well planned city, the layout of distribution pipes generally adopted, is

A water channel supported above the ground over trestles, is generally called

Pick up the incorrect statement from the following:

Pick up the incorrect statement from the following:

As per IS : 1172-1963, water required per head per day for average domestic purposes, is

Water to the consumers may be supplied from

The duration of contact of chlorine with water before it is served to the first consumer, should be at least

Water supply system includes

The maximum pressure to which a pipe is subjected to during its operation, is known

A slow sand filter is cleaned if its filter head is higher than

The intake opening is generally covered by a screen to prevent entry of debris etc. and its level is kept

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

Steel pipe are

When gravity and pumping systems of water distribution are adopted, the type of distribution reservoir, is

The force which develops in a pressure conduit supported on trestles, is

Standard unit of turbidity of water is in one litre of distilled water, one milligram of finely divided

For complete stabilisation of organic matter in polluted water, it takes

The external load per unit length of

Shales are

The best process of disinfection of public water supply, is by

Pick up the correct statement from the following:

The dilution ratio at which the odour is hardly detectable is generally called threshold odour number and for public supplies it should not exceed

Surge tanks are used

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

P.V.C. pipes can withstand pressure bead of water upto

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

The fire demand for a city of 50,000 populations, according to Godrich formula, is

Pick up the correct statement from the following:

For controlling algae, the most commonly used chemical, is

For centrifugal pumps

The storage capacity of a reservoir may be divided into three zones. The lowest zone is

Economic height of a dam is the height corresponding to which

For maximum alkalinity of water, pH value should be

The efficiency of a pumping set, is generally assumed

The population growth curve is

The fire demand for ascertaining the empirical formula 1136.5 [(P/10) + 10] known as

The bacterias which may survive with or without free oxygen, are called

Aeration of water is done to remove

The maximum pressure to which cast iron pipes may be subjected to, is

Water may not contain much impurity if its source is

In plain sedimentation tanks under normal conditions, impurities are removed upto

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

Pressure relief valves are provided in water mains

Quality of water is said to be good if it is

Sluice valves in main water supplies

The head against which the motor works for lifting water, is

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

Gravity conduits

At break point of chlorination,

Pick up the correct statement from the following:

The capability of a soil mass of full width and depth to transmit water, is known

The head against which the motor works for lifting water, is

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

Derivation of Thiem’s formula Q = 2nT (s1 – s2)/2.3 log™ foA!) is based on the assumption

Pick up the correct statement from the following:

Percussion drilling is unsuitable in

In an artesian aquifer, the draw downs in two observation wells at distances 100 m, and 200 m were found same after one hour and x hours respectively. The value of x, is

Rapid gravity filters can remove bacterial impurities up to a maximum of

Continuous flow of water can be expected from

Reciprocating pumps

Low turbidity of water is detected by

Pick up the correct statement from the following regarding radial flow centrifugal pumps:

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Silt storage is the same as

The type of pipe commonly used in water supply distribution schemes, is

Pick up the incorrect statement from the following. The source of surface water is from

Water supply includes

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

Acidity in water is caused due to