For a continuous flow type of sedimentation tanks

The asbestos cement sewers are

For efficient working of a sewer, it must be ensured that

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Pick up the correct statement from the following:

Bottom openings 15 cm x 15 cm in the standing baffle wall are provided

The pressure exerted by

For drainage pipes in buildings the test applied before putting them to use, is

No treatment of the sewage is given if dilution factor is

Which of the following pumps in used to pump sewage solids with liquid sewage without clogging the pump is?

Acid regression stage of sludge digestion at a temperature 21°C extends over a period of

Pick up the correct statement from the following:

The coagulant which is generally not used for treating the sewage, is

The layers of vegetable wastes and night soil alternatively piled above the ground to form a mound, is called

If the flame of a miner’s safety lamp in the upper layers of the sewer forms an explosive, the sewer certainly contains

The gas which may cause explosion in sewers, is

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Pick up the incorrect statement from the following:

The sewer pipes

The settling velocity of the particles larger than 0.06 mm in a settling tank of depth 2.4 is 0.33 m per sec. The detention period recommended for the tank, is

The Chezy’s constant C in the formula V = C Vrs depends upon

The discharge per unit plan area of a sedimentation tank, is generally called

Pick up the incorrect statement from the following for allowing workers to enter sewers

For the open drain (N = 0.025) shown in the below figure, the discharge is

To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self­cleaning velocity recommended for Indian conditions, is

Assertion (A): The determination of pH value of sewerage is important.
Reason (R): The efficiency of certain treatment methods depends upon the availability of pH value.

The normal values of over flow rates for sedimentation tanks using coagulant, ranges between

The drainage area of a town is 12 hectares. Its 40% area is hard pavement (K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is

Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for

The rational formula for peak drainage discharge, was evolved by

The sewer that unloads the sewage at the point of treatment is called

During preliminary treatment of a sewage

For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is

Dry weather flow is:

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Pick up the correct statement from the following:

If q is the average sewage flow from a city of population P, the maximum sewage flow

3/4th or 1/4th extra space is left in sewer pipes at maximum discharge for

If the flame of a miner’s safety lamp in a manhole extinguishes within 5 minutes, the sewer certainly contains

Hydraulic mean radius is

If the depth of flow in a circular sewer is 1/4th of its diameter D, the wetted perimeter is

Pick up the correct statement from the following:

The Brake Horse power of the motor (efficiency 60%) required for a pump of capacity 0.075 cumec for a total lift of 12 m, is

Aerobic bacterias

At the junction of sewers

Traps

The sewage treatment units in which anaerobic decomposition of organic matter is used, are called

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If the diameter of a sewer is 150 mm, the gradient required for generating self cleansing velocity, is

The sewer which received discharge from two or more main sewers, is known as

The grit and silt of the grit chambers, may not be used for

For treating the sewage of a large city, you will recommend

Imhoff cone is used to measure

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1000 kg of sewage contains

Dilution method of disposing of sewage, is not preferred to

If the peak discharge of a storm water drain (S.W. Drain) is expected to exceed 150 cumecs, the free board to be provided, is

The reduced levels of the string at the consecutive sight rails A and B are 203.575 m, 203.475 m respectively. If the difference of their R.D.s is 10 m, the gradient of the sewer line is

R.M.O. expenses include

For the COD test of sewage, organic matter is oxidised by K2Q2O7 in the presence of

The sludge does not contain waste water from

In sewers the velocity of flow should not be

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In sewers the effect of scouring is more on

The rainfall at any place may be determined by

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Pick up the correct statement from the following:

Sewer ventilating columns are generally placed at

The sewer which resists sulphide corrosion, is

In a sedimentation tank (length L, width B, depth D) the settling velocity of a particle for a discharge Q, is

The formula which accepts the value of rugosity coefficient n = 0.012 to be used in Manning’s formula, is given by

The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known

Water content of sewage is about

Skimming tanks are

The most efficient cross-section of sewers in a combined sewerage system is

The detention period for plain sedimentation water tanks, is usually

The factor responsible for purification of sewage in river is

Hume steel pipes are

To maintain aerobic biological activity, the moisture content of the compost mass should be about

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The pH value of sewage is determined with the help of

If the length of overland flow from the critical point to the mouth of drain is 13.58 km and difference in level between the critical point and drain mouth is 10 m, the inlet time is

The normal value of over flow rates for plain primary sedimentation tanks, ranges between

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Which one of the following statements regarding septic tanks is wrong?

In a trickling filter

In areas where rainy season is limited to a few months, the type of sewerage system recommended is

The rate of accumulation of sludge in septic tanks is recommended as

Dried sewage after treatment is used as

For drains up to 15 cumecs, the depth ‘d and width ‘B’ are related by

In areas where light rains are uniformly distributed throughout the year, the type of sewerage system to be adopted is

Self-cleansing velocity is

5 days-biochemical oxygen demand (BOD5) is taken at a temperature of

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If a 2% solution of sewage sample is incubated for 5 days at 20°C and the dissolved oxygen depletion was found to be 8 mg/l. The BOD of the sewage is

Pick up the in-correct statement from the following:

A well oxidized sewage contains nitrogen mainly as

The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

In a sludge tank, the gas mainly produced, is

Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to

Stoneware sewers are available in size

If ‘D’ is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is

In normal conditions, the period for sludge digestion, is

For evaporation and measurement of settable solids, the apparatus used, is

In trickling filter, B.O.D. is reduced to

For design of sewers, percentage of sewage discharge is assumed

The grit chambers of sewage treatment plants, are generally cleaned after

Maximum permissible velocity 1.5 m/sec, is adopted in drains

The average temperature of sewage in India, is

Cowl’ is provided at

If the discharge of a sewer running half is 628 1.p.s., i = 0.001, and n = 0.010, the diameter of the sewer, is

A drop manhole is provided if

For a circular sewer of diameter ‘D’ running partially full with central angle ‘a’,

The use of coarse screens for the disposal of sewage, may be dispensed with by

In the activated sludge process

For detecting the nitrates in sewage, the colour may be developed by adding

The settling velocity of a spherical particle of diameter less than 0.1 mm as per Stock’s law, is

In septic tanks,

Inter-distance between ventilation columns in a sewer line is kept

Stone ware pipes are

The intensity of rain is expressed in

The ratio of the diameter of a circular section and the side of a square section hydraulically equivalent, is

Which one of the following part of human body withstands minimum radiation?

Drop manholes are the manholes

The bottom of the sewage inlet chamber of septic tanks, is provided an outward slope

If 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is

Primary treatment of sewage consists of removal of

The sewers

Cement concrete sewers are only suitable if non-scouring velocity is between

In a fully mechanised composting plant, involves

The most widely used pump for lifting sewage is

If’yW is the unit weight of water, V the hydraulic mean depth of the sewer and ‘S’ the bed slope of the sewer, then the tractive force exerted by flowing water, is

Setting out the alignments of sewers may start from

The detention time of a circular tank of diameter d and water depth H, for receiving the sewage Q per hour, is

Lead acetate test in sewer manhole is done to test the presence of

Antisyphonage pipe is fitted

In a grit chamber of a sewage treatment plant,

The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is

pH value of sludge during alkaline regression stage, is

The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called

Pick up the incorrect size of stone ware sewers

Chlorination of water is done for the removal of

Sludge banks are formed if sewage is disposed of in

Assertion (A): A free board of 0.3 m is provided above the top sewage line in septic tanks. Reason (R): It helps to accommodate the scum in the septic tank.

The temperature affects the

The clarigesters are

The density of population over 40 hectares is 250/hectare. If water supply demand per day is 200 litres and sewage discharge is 80% of water supply, the sewage flow in sewers of separate system, is

In a residential colony, sewers of diameters 100 mm, 150 mm and 225 mm were laid with a gradient 1 in 120. Which portion of the sewage system does not choke in due course of time?

The spacing of bars for perforations in coarse screens used for the treatment of sewage, is

In case of Imhoff tanks,

The pH value of fresh sewage is usually

The maximum depth of sedimentation tanks, is kept

If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is

Pick up the correct statement from the following:

Lead caulked joints are used for laying

If D is the diameter of a circular sewer and D’ is the top horizontal diameter of an equivalent egg shaped section, the relationship which holds good, is

The spacing of man holes along a straight portion of a sewer is 300 m, the diameter of the sewer maybe

A sewer running partially full and hurried with back filled, fails in compression due to

A five day B.O.D. at 15°C of the sewage of a town is 100 kg/day. If the 5 day B.O.D. per head at 15°C for standard sewage is 0.1 kg/day, the population equivalent is

Kjeldahl nitrogen is a mixture of

The quantity of liquid waste which flows in sewers during the period of rainfall, is known

Nitrogen cycle of sewage, is

Depletion of ozone layer in the outer atmosphere may cause

The minimum diameter of a sewer is kept

A cylindrical ejector having its height 2 m fills after every 10 minutes with a peak sewage discharge of 0.0157 cumec. The diameter of the ejector chamber, is

Pick up the correct statement from the following:

Which one of the following gases is most significant as air pollutant?

Hazen’s formula VS = 418 (GS – Gw)d [(3T + 70)/100] is used for the settlement velocity of the particles of diameter

For sewers, inverted siphon is provided for

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For large sewers, maximum distance between manholes may be

In sewers designed with self cleansing velocity,

The value of Chezy’s constant C = 157.6/(1.81 + K/√r) is used in