31501. Chlorination of water is done for the removal of
31502. For evaporation and measurement of settlable solids, the apparatus used, is
31503. In SI units the power of sound is represented in
31504. A rain sanitary sewer is constructed to carry
31505. The sewage is pumped up
31506. Removal of oil and grease from sewage, is known
31507. The gas which may cause explosion in sewers, is
31508. In sewers the effect of scouring is more on
31509. The most dangerous pollutant in vehicular emissions is
31510. 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
31511. The clarigesters are
31512. Rate of flow of sewage is generally assumed
31513. Maximum permissible velocity 1.5 m/sec, is adopted in drains
31514. The digested sludge from septic tanks, is removed after a maximum period of
31515. For providing an Indian type W.C., the R.C.C. slabs in the toilet portion
31516. The gradient of sewers depends upon
31517. 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
31518. The drop man holes are generally provided in sewers for
31519. Sewer ventilating columns are generally placed at
31520. In case of Imhoff tanks,
31521. If the depth of partial flow in a sewer of diameter 2 m, is 50 cm, its wetted perimeter is
31522. A drop manhole is provided if
31523. In a city the ratio of the drainage to sewage is 20, the percentage discharge passing through non-monsoon periods, is
31524. The year in which Kerala State Roa Transport Corporation came into existence?
31525. The liquid wastes from kitchens, bath rooms and wash basins, is not called
31526. The presence of free ammonia in sewage, is detected by
31527. The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known
31528. The standard B.O.D. of water is taken for
31529. 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
31530. In which district the headquarter o Kerala Agro Machinery Corporation situates?
31531. In sewers the gas generally found, is
31532. A sewer running partially full and hurried with back filled, fails in compression due to
31533. A manhole is classified as shallow if its depth is between
31534. Which game is associated with ‘Davis Cup’?
31535. For design purposes, the normal rate of infiltration of ground water into the sewer, is
31536. The effluent of a septic tank is
31537. 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
31538. The detention period for plain sedimentation water tanks, is usually
31539. Fresh sewage may become stale in
31540. The small sewers are cleaned by
31541. Dry water flow in a combined sewer, is
31542. Which one of the following tests is used for testing sewer pipes :
31543. Nitrogen cycle of sewage, is
31544. In sewers the highest non-scouring velocity is achieved in
31545. In sewage having fully oxidised organic matter, the nitrogen exists in the form of
31546. It is customary to design a sewer for D.W.F. on the basis of
31547. During preliminary treatment of a sewage
31548. The largest district in Kerala:
31549. In septic tanks,
31550. The sewer pipe which carries sewage from a building for immediate disposal is