45701. For non-scouring velocity 5 m/sec, the type of sewers generally preferred to, is
45702. Disposal to sewage in large cities, is done in
45703. For the COD test of sewage, organic matter is oxidised by K2Cr207 in the presence of
45704. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of concrete is kept
45705. The asbestos cement pipes are generally laid
45706. Chlorination of water is done for the removal of
45707. For evaporation and measurement of settlable solids, the apparatus used, is
45708. In SI units the power of sound is represented in
45709. A rain sanitary sewer is constructed to carry
45710. The sewage is pumped up
45711. Removal of oil and grease from sewage, is known
45712. The gas which may cause explosion in sewers, is
45713. In sewers the effect of scouring is more on
45714. The most dangerous pollutant in vehicular emissions is
45715. If the depletion of oxygen is found to be 2.5 mg/litre after incubating 2.5 ml of sewage diluted to 250 ml for 5 days at 20°C, B.O.D. of the sewage is
45716. The clarigesters are
45717. Rate of flow of sewage is generally assumed
45718. Maximum permissible velocity 1.5 m/sec, is adopted in drains
45719. The digested sludge from septic tanks, is removed after a maximum period of
45720. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
45721. The gradient of sewers depends upon
45722. 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
45723. The drop man holes are generally provided in sewers for
45724. Sewer ventilating columns are generally placed at
45725. In case of Imhoff tanks,
45726. If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is
45727. A drop manhole is provided if
45728. In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
45729. The liquid wastes from kitchens, bath rooms and wash basins, is not called
45730. The presence of free ammonia in sewage, is detected by
45731. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
45732. The standard B.O.D. of water is taken for
45733. To prevent settling down of sewage both at the bottom and on the sides of a large sewer, self-cleaning velocity recommended for Indian conditions, is
45734. In sewers the gas generally found, is
45735. A sewer running partially full and hurried with back filled, fails in compression due to
45736. A manhole is classified as shallow if its depth is between
45737. For a circular sewer of diameter D running partially full with central angle α,
45738. For design purposes, the normal rate of infiltration of ground water into the sewer, is
45739. The effluent of a septic tank is
45740. 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 the maximum run off is
45741. The detention period for plain sedimentation water tanks, is usually
45742. Fresh sewage may become stale in
45743. The small sewers are cleaned by
45744. Dry water flow in a combined sewer, is
45745. Which one of the following tests is used for testing sewer pipes :
45746. Nitrogen cycle of sewage, is
45747. In sewers the highest non-scouring velocity is achieved in
45748. In sewage having fully oxidised organic matter, the nitrogen exists in the form of
45749. It is customary to design a sewer for D.W.F. on the basis of
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