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Design of Machine Elements 1 Question Paper - Dec 17 - Mechanical Engineering (Semester 5) - Visvesvaraya Technological University (VTU)
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Design of Machine Elements 1 - Dec 17

Mechanical Engineering (Semester 5)

Total marks: 80
Total time: 3 Hours
INSTRUCTIONS
(1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Draw neat diagrams wherever necessary.

1.a. Define standards and codes.
(4 marks) 00

1.b. A circular rod of diameter 50 mm is subjected to loads as shown in fig q1(b) , Determine the nature and magnitude of stresses at the critical points.

enter image description here

(12 marks) 00

Or

2.a. Briefly explain the phases of design process (Shigley's)
(4 marks) 00

2.b. A flat bar shown in fig.Q2(b) is subjected to an axcial load of 100 kN. Assuming that the stress in the bar is limited to 200N/mm², determine the thickness of bar

enter image description here

(12 marks) 00

Module-2

3.a. A cantilever beam of span 800 mm as a rectangular cross section of depth 200 mm. The free end of the beam is subjected to a transverse load of 1 kN that drops on to it from height of 40 mm. Selecting C40 steel (

enter image description here

(8 marks) 00

3.b. Rectangular cross section bar 200 mm long is subjected to an impact by an load of 1 kN that falls on to it from a height of 10 mm from rest. Determine the cross section dimension of rectangular bar. If the allowable stress of material of bar is 125 N/mm² . Assume the thickness depth is twice width .Also find the deformation due to impact.
(5 marks) 00

Or

4.a. A round rod of diameter 1.2d is reduced to a diameter 'd' with a fillet radius of 0.1 d. This stepped rod is to sustain a twisting moment that fluctuates between 2.5 kN-m to 1.5 kN-m together with a bending of 1+ kn-m . The rod is made of carbon steel C40 (
(16 marks) 00

Module-3

5 a. Solid Steel shaft running at 600 RPM is supported on bearing 600 mm apart. The shaft receives 40 KW/through a 400 mm diameter pulley weighing 400 N located 300 mm to be the right of left bearing by a vertical flat belt drive. The power is transmitted from the shaft through another pulley of diameter 600 mm weighing 600 N located 200 mm to the right of right bearing . The belt drives are at right angles to each other and ratio of belt tension is 3. Determine the size of shaft necessary , if the allowable shear stress in the shaft material is 40 MPa and the loads are steady
(16 marks) 00

Or

6.a. Design a flange coupling to connect the shafts of a motor and centrifugal pump for the following specifications. Pump output = 3000 litres/minute , total head b= 20m, pump speed=600rpm, pump efficiency = 70% . Select C40 steel ( \Sigma = 328.6 MPa) for shaft and C35 steel (Sigma = 304 MPa) for bolts with factor of safety 2. Use allowable shear stress in cast iron flanges equal to 15 N/mm²
(16 marks) 00

Module-4

7.a. Double riveted lap joint is to be made between 9 mm plates. If the safe working stresses in tension, crushing and share are 80, 120 and 60 N/mm² respectively, design the riveted joint.
(8 marks) 00

7.b. Determine the diameter of rivet for the joint shown in fig.Q7(b). The allowable stress in the rivet is 100 N/mm²

enter image description here

(8 marks) 00

Or

8.a. A 16 mm thick plate is welded to a vertical support by two welds as shown in the fig.q8 (a) . Determine the size of the weld , the permissible shear stress for the weld material is 75 MPa.

enter image description here

(8 marks) 00

8.b Determine the allowable stress in the joint shown in fig.q8 (b) , if the size of weld is 10mm

enter image description here

(8 marks) 00

Module-5

9.a. The structure in fig.q9(a) is subjected to eccentric load P = 10kN with eccentricity of 500mm. All hots are identical mode of carbon steel having yield strength in tension is 400MPa and factor bof safety is 2.5. Determine size of bolt

enter image description here

(8 marks) 00

9.b. A bracket is fixed to wall by 4 bolts and loaded as shown in fig.q9 (b) . Calculate the size of bolts if the load is 10 kN and allowable shear stress in bolt material is 40 MPa

k

(8 marks) 00

Or

10.a. Design a screw jack (complete design) with a lift of 300 mm to lift a load of 50 kN. Select C40 steel ( sigma = 328.6 MPa) for the screw and soft phosphor bronze ( sigma = 345 MPa and sigma = 138 MPa) for nut
(16 marks) 00

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