B.Tech III Year II Semester (R09) Supplementary Examinations December/January 2014/2015 World

Transcription

1 Code: 9A01601 World DESIGN & DRAWING OF STEEL STRUCTURES Use of IS 800:2007, IS , IS:875 (Part III)-1987, structural steel tables are to be permitted in the examination ha PART A (Answer any one question, 1 28 marks) 1 Design a slab base for a column section ISHB 350 carries an axial ad f 1500 kn. The permissible bearing pressure on concrete is 5 N/mm 2. SBC of soil is 200 kn/m 2. Draw: (a) Side view of gusseted base. (b) Plan view of gusseted base. 2 Design a welded plate girder of 30 m span to support a live load of 75 kn/m uniformly distributed over the span. Adopt permissible stress as per IS Draw the longitudinal elevation, cross section and plan of the girder. 3 (a) What are the advantages of welded connections? (b) PART B (Answer any three questions, 3 14 marks) Two plate 180 mm x 10 mm are to be connected in a lap joint, the connection being made by transverse filleted weld and necessary plug welds. Design the connection. Use 6 mm welds. 4 (a) Explain the shear and bearing stresses the beams subjected to and the maximum permissible as per IS 800. (b) Design of simply supported beam of 8 m span for carrying a U.D.L of 40 kn/m if the beam is laterally unsupported. Each end of the beam is restrained against torsion and ends of compression flanges are fully restrained against lateral bending. 5 (a) Write about net effective section for angles. (b) The tension member of a roof truss consists of a single ISA 100 x 75 x 10 mm thick, connected at the end to agusset p ate with the longer leg vertical with 18 mm dia rivets. Find the safe tension the member can withstand permissible tensile stress may be taken as 150 N/mm Design a column with two channels placed back to back 10 m long to carry an axial load of 750 kn. The column is restrained in position but not in direction at both ends. Provide lacing system with connections. The principal rafter in a tubular truss carries a load of 180 kn. A tie member meeting at 45 0 to it carries a load of 1000 kn. The panel length of the rafter is 2.4 m and that of the tie member is 2.5 m. Design the members using Y st 240 Gr steel tubes.

2 Code: 9A01602 GEOTECHNICAL ENGINEERING I 1 (a) Derive an expression for bulk unit weight in terms of its specific gravity of solids, voids atio, degree of saturation and unit weight of water. (b) The wet density of a glacial deposit is 19.2 kn/m 3. The specific gravity f the s il is 2.67 and the moisture content of the soil is 12% by dry weight. Calculate: (i) Dry density. (ii) P sity. (iii) Voids ratio. (iv) Air content. (v) Percentage air voids. 2 (a) Explain preparation of soil suspension for sedimentation analysis. (b) The plastic limit of soil is 30% and its plasticity index is 10%. When the soil is dried from its state to plastic limit, the volume change is 27% of its volume at plastic limit. Similarly, the corresponding volume change from the liquid limit to the dry state is 36% of its volume at liquid limit. Determine the shrinkage limit and the shrinkage ratio. 3 (a) Define permeability of a soil mass. Explain how you will determine the permeability of a sandy soil sample in the laboratory. (b) Discuss the factors affecting the permeability of soils. State the limitations of Darcy s law. 4 (a) What is the effect of seepage pressure on the effective stress? Give examples. (b) A 12 m thick layer of relatively impervious saturated clay lies over a gravel aquifer. Piezometer tubes introduced to the gravel layer show an artesian pressure condition with the water level standing in the tubes 3 m above the top surface of the clay stratum. The properties of the clay are e = 1.2, G = 2.7 and sat = kn/m 3. Determine (i) the effective stress at the top of the gravel stratum layer, and (ii) the depth of excavation that can be made in the clay stratum without bottom heave. 5 (a) Explain Westergaard s theory for the determination of the vertical stress at a point. How is it different from Boussinesq s solution? (b) What is Newmark s influence chart? Explain its construction and uses. 6 (a) Exp ain control of compaction in the field. (b) In a standard Proctor compaction test on a soil the following results were obtained. Bulk density (Kg/m 3 ) Moisture content (%) What is the optimum moisture content and maximum dry density? If the specific gravity of solids is 2.65, p ot the zero air voids line. 7 (a) Obtain the differential equation defining the one-dimensional consolidation as given by Terzaghi, listing the various assumptions. (b) In a laboratory consolidation test, the void ratio of the sample reduces from 0.85 to 0.73 as the pressure was increased from 1 to 2 kg/cm 2. If the coefficient of permeability of the soil be cm/sec. Determine: (i) Coefficient of volume change. (ii) Coefficient of consolidation. 8 (a) Describe in detail the triaxial compression test and how to find out the shear strength parameters. (b) What are the advantages of triaxial test over the direct shear test?

3 Code: 9A01603 ENVIRONMENTAL ENGINEERING - I Time: 3 hours Max. Marks: 70 1 (a) Determine the future population of a satellite town by geometric inc ease method for the year 2014, given the following data. Year Population in thousand ? (b) List any 7 drinking water quality standards. 2 (a) Write the advantages and disadvantages of alum and iron salts as coagulants. (b) Mention various types of feeding devices. Explain any one with neat sketch. 3 (a) Explain the operational troubles in filtration unit. (b) Explain the theory of filtration. 4 (a) Write the advantages and disadvantages of grid iron system and dead end system. (b) Explain the following: (i) Gate values. (ii) Scour values. 5 (a) Explain the procedure to test the pipeline. (b) Explain water carriage and conservancy system. 6 (a) Explain one pipe and two pipe systems of plumbing. (b) Write a short note on sewage forming. 7 (a) The sewage is flowing 4.5 mld form a primary clarifier to a standard rate trickling filter. The 5 day BOD of the influent is 160 mg/l, the volume of the adopted organic loading is to be 160 g/m 3 /day and surface loading 2000 L/m 2 /day. Determine the volume of filter and its depth also calculates the efficiency of this filter unit. (b) Exp ain the principle of oxidation ponds. 8 (a) Explain the working principle of sludge digestion tank. (b) List the advantages and disadvantages of septic tank.

4 Code: 9A01604 WATER RESOURCES ENGINEERING II 1 What is an earth dam? What is a rockfill dam? Also discuss the va i us advantages and disadvantages of earth and rockfill dams. 2 What is a gravity dam? List and briefly explain the various f rces acting n a gravity dam. Also list the various modes of failure of a gravity dam. 3 What is a rolled-fill earth dam? Also explain the different types of rolled-fill earth dams. 4 What are spillway gates? List the various types and explain each in brief. 5 What are the methods of controlling entry of silt at the head works of a canal? 6 What is cistern element in fall? Give various expressions for its dimensions. 7 A submerged pipe outlet has the following data FSL of distributary = M FSL of water course = M Length of the pipe = 9.00 M Diameter of the pipe = 20 cm Coefficient of friction = Find the discharge through the outlet. 8 Differentiate between Aqueduct and Siphon aqueduct.

5 Code: 9A01605 ESTIMATION, COSTING & VALUATION Standard scheduled of rates is permitted in the examination hall 1 What are the general requirements for installation? Explain the specificati ns for drainage board and wash basin installations. 2 Work out the quantities for the following items for figure shown below. (a) Earth work excavation. (b) Cement concrete in foundation. (c) Brick work. (d) 2.5 cm CC (1:1.5:3) in surface finish. 3 Estimate the quantity of earth work for an embankment, 120 m long, 8m wide at crest and whose side slopes is 2 to 1. The central height from 0 to at every 30 m intervals are 0.60 m, 1.2 m, 1.6 m, 2.0 m and 1.3 m. Calculate the earth work using mid section formula and trapezoidal formula. 4 What are the five subheads in rate analysis? Explain them clearly. Contd. in page 2 Page 1 of 2

6 in / 5 Workout the quantity of steel in a R.C.C lintel over a door opening from the given rawing.. Also prepare the bar bending schedule. Code: 9A01605 blogspot. World 6 (a) Why it is recommended to use standard forms of contract? What are the matters to be defined in the conditions of contract? Elaborate. (b) What are the contents of a tender document? Enumerate the complete tendering procedure with illustrations. 7 (a) Differentiate between the following: (i) Salvage value and scrap value. (ii) Free hold and lease hold properties. (b) A property is let out a monthly rent of Rs. 1,500/-. If the out goings is taken at 30% of gross annual rent, and if the owner of the property expects a return of 12%, what is the capitalized detailed specifications for stone masonry, doors and windows. JNTU 8 All va ue of the property?

7 Page 2 of 2

8 Code: 9A01606 TRANSPORTATION ENGINEERING 1 What are obligatory points? How do they influence the road alignment? With the help of neat sketches explain about various obligatory points. 2 (a) Discuss the importance of stopping sight distance at intersecti ns and the factors that influence the visibility at intersections. Explain the design principle of an intersection to ensure the minimum sight distance required. (b) Calculate the minimum sight distance required to avoid a head-on collision of two cars approaching from the opposite direction at 100 kmph and 80 kmph on a road section. Assume a reaction time of 2.5 seconds, coefficient of friction of 0.7 and brake efficiency of 50 percent in either case. 3 (a) What are the methods of accident data recording? Briefly discuss. (b) What measures can be adopted to prevent road accidents? Explain. 4 (a) What are the advantages and disadvantages of traffic signals? Discuss. (b) Explain the IRC method of traffic signal design. 5 What are the objectives of channelization? What are the features of channelizing islands? 6 (a) Explain the concept of ESWL. (b) Calculate the ESWL of a dual wheel assembly carrying 2400 kg each for different pavements with thicknesses of 15 cm, 20 cm and 25 cm. Take centre to centre tyre spacing as 27 cm and the distance between the walls of tyres as 11 cm. 7 What factors are to be given consideration in the selection of a site for an airport? Explain. 8 Write short notes on the following: (a) pron flood lighting. (b) Clearance bars. (c) Taxiway edge lighting. (d) Taxiway centre line lighting.