Q.1Answer the following :
(i)State and explain Hooke’s law.
(ii)Define shear force and bending moment.
(iii)What is equivalent length of a column?
(iv)Define principal plane and principal stress.
(v)What are the two conditions to be satisfied in the design of a circular shaft?
Q.2Solve the following :
(i)Estimate the load carried by a bar if the axial stress is 10 N/mm2 and the diameter of the bar is 10 mm.
(ii)What is the strain energy stored when a bar of 6 mm diameter 1m length is subjected to an axial load of 4 kN, E = 200 kN/mm2?
(iii)Find the minimum diameter of shaft required to transmit a torque of 29820 Nm if the maximum shear stress is not to exceed 45 N/mm2.
(iv)Find the critical load of an Euler’s column having 4 m length, 50 mm × 100 mm cross section and hinged at both ends E = 200 kN/mm2.
(v)Calculate the maximum deflection of a simply supported beam carrying a point load of 100 kN at mid span. Span = 6 m, EI = 20000 kN/m2.
Q.3(a)A cantilever beam 3 m long carries a load of 20 kN at its free end. Calculate the shear force and bending moment at a section 2 m from the free end.
(b)Sketch the bending stress distribution and shear stress distribution for a beam of rectangular cross section.
Q.4A hollow shaft, having an internal diameter 50% of its external diameter, transmits 600 kW at 150 rpm. Determine the external diameter of the shaft if the shear stress is not to exceed
65 N/mm2 and the twist in a length of 3 m should not exceed 1.4 degrees. Assume maximum torque = 1.2 times the mean torque and modulus of rigidity = 1 × 105 N/mm2.
Q.5(a)State the assumptions made in the theory of simple bending. Derive the bending formula .
(b)A cantilever beam of spring 2 m is carrying a point load of 20 kN at its free end. Calculate the slope at the free end. Assume EI = 12 × 103 kN-m2.
Q.6Calculate the effective length of a long column, whose actual is 4 m when :
(i)Both ends are fixed, and
(ii)One end fixed while the other is free.
Q.7(a)The normal stresses in two mutually perpendicular directions are 110 N/mm2 and
47 N/mm2 both tensile. The complementary shear stresses in these directions are of intensity 63 N/mm2. Find the principal stresses and its planes.
(b)A cylinder shell 3 m long which is closed at the ends has an internal diameter 1 m and wall thickness of 15 mm. Calculate the change in dimensions and change in volume if the internal pressure is 1.5 N/mm2, E = 2 × 105 N/mm2. υ = 0.3.
Q.8(a)State Moment-Area Mohr’s theorem.
(b)A simply supported beam AB uniform section, 4 m span is subjected to a clockwise moment of 10 kN.m,applied at the right hinge B. Derive the equation to the deflected shape of the beam. Locate the point of maximum deflection and find the maximum deflection.
Q.9(a)Derive a relation for change in length of a bar of uniformly tapering circular section subjected to an axial tensile load ‘W’.
(b)A reinforced concrete column 500 mm × 500 mm in section is reinforced with 4 steel bars of 25 mm diameter one in each corner, the column is carrying a load of 1000 kN. Find the stresses in the concrete and steel bars. Take E for steel = 210 × 103 N/mm2 and E for concrete = 14 × 103 N/mm2.
Q.10Draw shear force and bending moment diagram for the beam shown in Figure 1. Show the point of contra flexure also.
Figure 1
Q.1(a)State various disciplines of the civil engineering. Explain in brief transportation engineering.
(b)Describe the basic parts of a building with help of a neat sketch.
Q.2(a)What is meant by foundation? Explain the functions of foundation.
(b)What is meant by bearing capacity of soil? Explain in brief the methods of improving bearing capacity of soil.
Q.3(a)What are the objectives of plastering? Enlist types of plastering.
(b)Explain in detail the process of curing. State the method of curing.
Q.4(a)What are the different types of trusses and draw with neat sketches?
(b)Sketch different types of hinges for doors and windows.
Q.5(a)Give the classification of doors based on working operations. Explain swinging door with sketch.
(b)Enlist types of windows. Explain dormer window with neat sketches.
Q.6(a)Enlist the different types of flooring. Explain.
(b)What do you mean by creep of concrete? Explain the various factors on which creep of concrete depends, in brief.
Q.7(a)Discuss the significance of bond in brick.
(b)What is bulking of sand? Explain with sketch.
Q.8(a)Explain in brief the construction of Water Bound Macadam (WBM) road.
(b)Discuss the points to be considered while selecting location for an airport.
Q.9(a)Describe the importance of quantity surveying in any construction project.
(b)Enlist the different types of joint. Draw the sketches of lap joint and butt joint in a riveted connection.
Q.10Write short notes on the following :
(i)Plat load test
(ii)Soil as a three phase system
(iii)Soil classification
(iv)Reinforced concrete
(v)Gauge in rail track
Q.1(a)Explain the difference between the AC and DC. Write down the advantages of AC over DC.
(b)Explain the following terms :
(i)RMS value
(ii)Average value
(iii)Form factor
Q.2(a)State and explain Norton’s Theorem. What is the Norton equivalent of an ideal AC current source?
(b)State and explain the following :
(i)Superposition theorems
(ii)Maximum power transfer theorems
Q.3(a)Find the resistance at 20oC of 5 km of copper wire of cross-sectional area 0.5 cm2, if the specific resistance of copper at this temperature is 17.3 10– 9-m. What would be its resistance at 40oC if = 0.0043 per oC?
(b)Explain the merits of three phase system.
Q.4(a)How the power factor is improved in electrical power distribution system?
(b)Explain the construction and working of DC generator.
Q.5(a)Explain the following with reference DC machines :
(i)Armature reaction
(ii)Commutation
(b)Characteristics of DC motors.
Q.6(a)What is need of starter in case of DC motor? Explain the advantage of four point starter over three point starter.
(b)Explain the different methods of speed control of DC motor.
Q.7(a)What is the effect of reversing the polarity of supply voltage on the direction of rotation in the case of shunt, series and compound dc motors. Comment.
(b)Explain the torque-armature characteristics of :
(i)A dc series motor
(ii)A dc shunt motor
Q.8(a)Explain the following test in a transformer :
(i)Open circuit (OC) test
(ii)Short circuit (SC) test
(b)The following data were obtained on a 20 kVA, 50 Hz, 2000/200 V distribution transformer :
Voltage(V) / Current
(I) / Power
(P)
OC test with HV open circuited / 200 / 4 / 120
SC test with LV short circuited / 60 / 10 / 300
Draw the approximate equivalent circuits of the transformer referred to HV and LV sides, respectively.
Q.9Write short notes on following :
(i)Auto transformer
(ii)Instrument transformer
Q.10(a)Explain the construction and working principle of three phase induction motor.
(b)Explain the construction and working principle of synchronous generators.
Q.1(a)Brief about different types of machine drawing.
(b)Write about sectional views, with suitable diagrams.
(5 + 5 = 10)
Q.2(a)Write about types of thread profile with neat diagrams.
(b)Draw external thread and internal thread profiles for (i) M52, (ii) M30 and (iii) M39 3.
(6 + 4 = 10)
Q.3(a)Write down the procedure for Drawing Nut of a Bolt.
(b)Draw the diagram of a Lock Nut.
(6 + 4 = 10)
Q.4(a)What is Riveting? Describe about structural joints with diagram.
(b)What is the use of a key? Explain types of key.
(5+ 5 = 10)
Q.5(a)Explain ‘flexible coupling’ with neat diagram.
(b)Write about types of ‘Pipe Joint’.
(6+ 4 = 10)
Q.6(a)SKF 6208 bearing has 9 balls each of 12 mm diameter. The single row bearing has following dimensions, Outer diameter (D) = 80 mm, Inner diameter (V) = 2 mm,
Width (B) = 18 mm, Corner radius (V) = 2 mm. Draw elevation half in section and side view full.
(b)Brief about types of Bearing.
(6 + 4 = 10)
Q.7(a)Explain with example, the copper pipe joint and steel pipe joint.
(b)Show the conventional representation of some machine parts.
(5 + 5 = 10)
Q.8For two rods of diameter 25 mm draw elevation and plan of a knuckle joint. Show partial section of elevation. For inside and outside surfaces of fork take respective radii of 14 and
32 mm
(10)
Q.9Write about the following :
(i)Flexible and Muff coupling
(ii)First angle projection and Third angle projection.
(5 + 5 = 10)
Q.10(a)Two steel plates 12.5 mm thick are jointed in a double cover butt joint. The steel plates are 320.5 mm wide and lozenge shape cover is shown in Figure 1 with proposed holes. Draw the front and top views of the joint.
Figure 1
(b)Explain the terms associated with riveted joints.
(6 + 4 = 10)
Q.1(a)Define system and surroundings.
(b)60 liters of air at 70oC expands from 7 bar to 1.05 bar according the law PVn = C. The volume of air after expansion is 300 liters. Determine the mass of air and the work done during the process.
Q.2(a)Explain the three laws of thermodynamics with suitable examples.
(b)A system receives 200 kJ of energy of heat, at constant volume. Then it is cooled at constant pressure when 50 kJ of work was done on the system while it rejects 70 kJ of heat. Supposing the system is restored to the initial state by an adiabatic process, how much work will be done by the system?
Q.3(a)Explain sensible and latent heat.
(b)Derive the expression for work done in an isothermal process.
Q.4List down various boiler accessories and explain any two of them.
Q.5(a)Enumerate the differences between ‘Fire Tube Boiler’ and ‘Water Tube Boiler’.
(b)Describe Rankine cycle with a neat schematic and a T-S diagram.
Q.6Explain reheating and regeneration in a steam power plant with the help of a suitable schematic and T-S diagram.
Q.7Derive the expression for mass flow rate in a convergent-divergent nozzle.
Q.8Explain velocity compounded and pressure compounded turbine with the help of suitable sketches.
Q.9Steam in a closed system expands reversibly and adiabatically from dry saturated conditions at 180oC to 500 kPa. Calculate the heat transfer to the system and the work per kg.
Q.10Explain emissivity, absorptivity, transmissivity and reflectivity for a body. What is the value of emissing for a black body?
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