45651. What is the recommended grade of tar for grouting purpose ?
45652. Which of the following statements is/are true in relation to the term 'detention period' in a settling tank?1. It may be determined by introducing a dye in the inlet and timing its appearance at the outlet.2. Greater the detention period, greater the efficiency of removal of settleable matter.3. It is the time taken for any unit of water to pass through the setting basin.4. It is usually more than the flowthrough period.Select the correct answer using the codes given below :
45653. If a soil sample of weight 0.18 kg having a volume of 10-4 m3 and dry unit wt. of 1600 kg/m3 is mixed with 0.02 kg of water then the water content in the sample will be
45654. With 'n' variables and 'm' fundamental dimensions in a system, which one of the following statements relating to the application of the Buckingham's Pi Theorem is incorrect ?
45655. Two sources generate noise levels of 90 dB and 94 dB respectively. The cumulative effect of these two noise levels on the human ear is
45656. A cohesionless soil having an angle of shearing resistance of φ, is standing at a slope angle of i. The factor of safety of the slope is tan i
45657. Sewage sickness occurs when
45658. A steel cable of 2 cm diameter is used to lift a load of 500π kg. Given that, E = 2 x 106 kg/cm2 and the length of the cable is 10 m, the elongation of the cable due to the load will be
45659. Consider the following statements regarding tensile test diagrams for carbon steel with varying carbon contents :As the carbon content increases1. the ultimate strength of steel decreases 2. the elongation before fracture increases3. the ductility of the metal decreases 4. the ultimate strength increases.Of these statements :
45660. Negative skin friction on a pile under vertical compressive load acts
45661. The defect which develops due to uncontrolled and non-uniform loss of moisture from wood is known as which one of the following ?
45662. Consider the following statements in respect of the critical depth of flow in a prismatical rectangular channel:1. For known specific emergy, discharge is minimum.2. For known discharge, the specific energy is minimum.Which of the statements given above is/are correct ?
45663. On the basis of the data given in the following figures, the bending moment under the load would work out to
45664. What is the innermost portion of approach zone which is the most critical portion from obstruction viewpoint, called ?
45665. A circular plate 100 mm diameter is welded to another plate by means of 6 mm fillet weld. If the permissible shearing stress in the weld equals 10 kg/mm2, then the greatest twisting moment that can be resisted by the weld will be
45666. A fixed beam is subjected to ment M0 as shown in the figure. The fixed end moments will be :
45667. Consider the following steps :1. Driving sheet piles surrounding a vibration-receiving structure.2. Digging a trench around a source of vibration.3. Placing rubber mountings between a machine causing vibration and its base. Active isolation of vibration can be achieved by
45668. Two reservoirs at different surface elevations are connected by a set of two pipes A and B of same diameter and length in parallel. If the friction factor of A is 4 times that of the pipe B, what is the ratio of the discharge in A to that in B ?
45669. Which of the following should be employed to provide lateral support to the beams ?1. Bracing of compression flanges.2. Shear connectors.3. Bracing of tension flanges4. Embedding compression flanges into R.C.C. slab.Select the correct answer using the codes given below :
45670. Which type of light energy is effectively absorbed by CO2 in the lower boundary of the troposphere ?
45671. The following steps are involved in laying a sewer in a trench :1. Transferring the center line of the sewer to the bottom trench.2. Setting sight rails over the trench.3. Driving pegs to the level of the invert line of the sewer.4. Placing the sewer of these steps is The correct sequence of these steps is
45672. A horizontal rod AB carries three loads of 3.0 kg, 7.0 kg and 10.0 kg at distances of 2.0 cm, 9.0 cm and 15 cm respectively from A where it is hinged. Neglecting the weight of the rod, which is the point at which the rod will be balance ?
45673. Distemper is used to coat
45674. Two simply supported beams B1 and B2 have spans l and 2l respectively. Beam B1 has a cross-section of 1 x 1 units and beam B2 has a cross-section of 2 x 2 units. These beams are subjected to concentrated loads W each at the centre of their spans. The ratio of the maximum flexural stress in these beams is
45675. If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
45676. The non-clog pump which permits solid matter to pass out with the liquid sewage, is
45677. Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.
45678. The width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is
45679. In olden days the type of section adopted in trunk and out fall sewers was
45680. For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
45681. In a fully mechanised composting plant, involves
45682. If the over land flow from the critical point to the drain is 8 km and the difference in level is 12.4 m, the inlet time is
45683. An inverted siphon is designed generally for
45684. A rainfall may be classified as acidic if its pH value is less or equal to
45685. When drainage to sewage ratio is 20, the peak dry weather flow is
45686. For treating the sewage of a large city, you will recommend
45687. The dimensions of a rectangular settling tank are : length 24 m, width 6 m and depth 3 m. If 2 hour detention period for tanks is recommended, the rate of flow of sewage per hour, is
45688. The screens are fixed
45689. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
45690. Clogging of sewers, is caused due to
45691. A sewer pipe contains 1 mm sand particles of specific gravity 2.65 and 5 mm organic particles of specific gravity 1.2, the minimum velocity required for removing the sewerage, is
45692. The coagulant widely used for sewage treatment, is
45693. House connections to the laterals is generally made by
45694. The ratio of maximum sewage flow to average sewage flow for mains up to 1 m in diameter, is
45695. Dilution method of disposing off sewage, is not preferred to
45696. For house drainage minimum gradient is
45697. If the side of a square sewer is 1000 mm, the diameter of a hydraulically equivalent circular section, is
45698. The ratio of minimum hourly flow to the average flow of sewage is
45699. Bio-chemical oxygen demand (BOD) for the first 20 days in generally referred to
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