Q. For sewer mains of 0.5 to 1 m diameter, the ratio of maximum daily sewage flow to the average daily sewage flow is assumed

View solution

Q. 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

View solution

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

View solution

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

View solution

Q. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity, is

View solution

Q. In 1000 kg of sewage, the total solids approximate

View solution

Q. Pathogens (or pathogentic bacterias) in water may cause

View solution

Q. Sewer manholes are generally provided at

View solution

Q. The sewers

View solution

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

View solution

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

View solution

Q. 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

View solution

Q. Oxidation process results in the formation of

View solution

Q. Dry weather flow is :

View solution

Q. As compared to fresh river water, sea water contains oxygen

View solution

Q. Sewer pipes need be checked for

View solution

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

View solution

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

View solution

Q. In the activated sludge process

View solution

Q. The settlement velocity of a solid (diameter 0.5 mm, specific gravity 1.75) in water having temperature 10°C, is

View solution