31601. Lead acetate test in sewer manhole is done to test the presence of
31602. Dried sewage after treatment is used as
31603. The use of coarse screens for the disposal of sewage, may be dispensed with by
31604. Sewer pipes are designed for maximum discharge with 25% to 33% vacant cross-sectional area for
31605. 5 days-biochemical oxygen demand (BOD5) is taken at a temperature of
31606. Water content of sewage is about
31607. Imhoff cone is used to measure
31608. For a grit chamber, if the recommended velocity of flow is 0.2 m/sec and detention period is 2 minutes, the length of the tank, is
31609. A nuisance is experienced in diluting water if dilution factor is less than
31610. Traps
31611. For estimating the peak run off the rational formula Q = 0.0278 KpA was evolved by
31612. The scheme of 'Laksham Veedu' was launched by:
31613. The most tragic event connected with Malabar rebellion:
31614. 3.0 ml of raw sewage is diluted to 300 ml. The D.O. concentration of the diluted sample at the beginning of the test was 8 mg/l. After 5 day-incubation at 20°C, the DO. concentration was 5 mg/l. The BOD of raw sewerage is
31615. The arrangement made for passing the sewer line below an obstruction below the hydraulic gradient lines called
31616. The angle subtended by the surface of sewer water with partial flow, at sewer centre is 120°, the depth of sewerage is
31617. Imhoff cone is used to determine
31618. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of 0.2 m/sec. If the ratio of width to depth is 2, the depth is
31619. The sewer which received discharge from two or more main sewers, is known as
31620. A well oxidized sewage contains nitrogen mainly as
31621. A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of
31622. 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.
31623. The French Revolution was in th year .........?
31624. Drop manholes at the junctions of sewer lines, are provided if
31625. The most effective arrangement for diverting excess storm water into a natural drainage, is
31626. Large diameter sewers subjected to external pressure alone, are reinforced
31627. Keralappazhama written by?
31628. In sewage, the solids in mg per litre is
31629. 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
31630. If D is the diameter of upper circular portion, the overall depth of New Egg shaped sewer section, is
31631. During putrifaction process of sewage the gas given off, is
31632. A circular sewer section is preferred to because
31633. 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.
31634. If the grit in grit chambers is 4.5 million litres per day, its cleaning is done
31635. The gas evolved in sewers is
31636. The maximum depth of sedimentation tanks, is kept
31637. 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
31638. The detention time (t) of a settling tank, may be defined as the time required for
31639. Discrete or granular particles change their
31640. For a peak discharge of 0.0157 cumec, with a velocity of 0.9 m/sec, the diameter of the sewer main, is
31641. For design of sewers, percentage of sewage discharge is assumed
31642. In case of sewer lines
31643. The sewerage system originates from
31644. In sewers the velocity of flow should not be
31645. Who got the first Kelappaji Puraskaram?
31646. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
31647. The design period of sewage treatment works in normally
31648. The porosity of sediments in sewer pipes, is usually taken as
31649. In septic tanks, decomposition of organic bacteria, is done by