The sewerage system consists of

Sewer pipes need be checked for

The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.in water having temperature 10°C, is

If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of

Aerobic activity is maximum

The minimum diameter of a sewer is kept

If γ_w is the unit weight of water, r the hydraulic mean depth of the sewer and S the bed slope of the sewer, then the tractive force exerted by flowing water, is

The ratio of design discharge to the surface area of a sedimentation tank is called

In sewers designed with self cleansing velocity,

The minimum diameter of sewer to be adopted is

In detritus tanks,

Inkg of sewage, the total solids approximate

Stone ware pipes are

Which one of the following resists hydrogen sulphide corrosion

D is the diameter of a circular sewer and α is the side of a square section sewer. If both are hydraulically equivalent, the relationship which holds good, is

To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by pottassium dichromate in the presence of

The width of a settling tank with 2 hour detention period for treating sewagecu m per hour, is

Pathogens (or pathogentic bacterias) in water may cause

In the activated sludge process

Skimming tanks are

The settlement of a particle in sedimentation tank, is affected by

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

If n is the rugosity coefficient, r is the hydraulic depth, s is the bed slope of sewer, the velocity of flow in m/sec may be obtained by the formula evolved by

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

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

Sewer manholes are generally provided at

Pick up the correct statement from the following :

If the length of overland flow from the critical point to the mouth of drain is 13.km and difference in level between the critical point and drain mouth ism, the inlet time is

Hume steel pipes are

The suitable cross-section of sewers to carry combined flow, 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.

Antisyphonage pipe is fitted

Oxidation process results in the formation of

Before discharging the foul sewage into rivers, it is generally treated by

With self cleansing velocity in sewers

For drains up tocumecs, the depth d and width B are related by

Dry weather flow is :

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

Before discharging the foul sewage into rivers, it is generally treated by

As compared to fresh river water, sea water contains oxygen

In the activated sludge process

For drains up tocumecs, the depth d and width B are related by

With self cleansing velocity in sewers

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

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