45851. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
45852. 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.
45853. Drop manholes at the junctions of sewer lines, are provided if
45854. The most effective arrangement for diverting excess storm water into a natural drainage, is
45855. Large diameter sewers subjected to external pressure alone, are reinforced
45856. In sewage, the solids in mg per litre is
45857. 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
45858. If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
45859. During putrifaction process of sewage the gas given off, is
45860. A circular sewer section is preferred to because
45861. Assertion (A) : The minimum self cleansing velocity in the sewer, at least once a day, must be generated. Reason (R) : If certain deposition takes place and is not removed, it obstructs free flow and causes further deposition leading to complete blocking of the sewer.
45862. If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
45863. The gas evolved in sewers is
45864. The maximum depth of sedimentation tanks, is kept
45865. 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
45866. The detention time (t) of a settling tank, may be defined as the time required for
45867. Discrete or granular particles change their
45868. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is
45869. For design of sewers, percentage of sewage discharge is assumed
45870. In case of sewer lines
45871. The sewerage system originates from
45872. In sewers the velocity of flow should not be
45873. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
45874. The design period of sewage treatment works in normally
45875. The porosity of sediments in sewer pipes, is usually taken as
45876. In septic tanks, decomposition of organic bacteria, is done by
45877. The stone ware sewers
45878. 'Cowl' is provided at
45879. The sewer which transports the sewage to the point of treatment, is called
45880. Kjedahl nitrogen is a mixture of
45881. You are asked to design sewer pipes of diameters 0.4 m to 0.9 m at maximum flow, you will assume the sewer flow running at
45882. 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
45883. Sewer pipes need be checked for
45884. If D.O. concentration falls down to zero in any natural drainage, it indicates the zone of
45885. The ratio of design discharge to the surface area of a sedimentation tank is called
45886. In the activated sludge process
45887. The minimum diameter of a sewer is kept
45888. The minimum diameter of sewer to be adopted is
45889. To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by pottassium dichromate in the presence of
45890. The discharge per unit plan area of a sedimentation tank, is generally called
45891. 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
45892. For detecting the nitrites in the sewage, the matching colour may be developed by adding
45893. The suitable cross-section of sewers to carry combined flow, is
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