Design Of Machine Members-I B.Tech Question Paper : vardhaman.org
College : Vardhaman College Of Engineering
Degree : B.Tech
Department : Mechanical Engineering
Semester : V
Subject : Design Of Machine Members-I
Document type : Question Paper
Website : vardhaman.org
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Design Of Machine Members-I Question Paper :
Four Year B. Tech V Semester Supplementary Examinations June – 2014
(Regulations : VCE-R11)
(Mechanical Engineering)
Date : 19 June, 2014 FN
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Related : Vardhaman College Of Engineering Metrology & Surface Engineering B.Tech Question Paper : www.pdfquestion.in/6369.html
All parts of the question must be answered in one place only
Unit – I :
1. a) Explain the factors for selecting a material? 7M
b) State the advantages and disadvantages of using cast iron as an engineering materials. 8M
2. a) Draw a stress strain diagram of a ductile and explain all the salient points in it. 8M
b) Write short notes on theories of failure. 7M
Unit – II :
3. a) Define the following:
i. Stress concentration
ii. Theoretical stress concentration factor
iii. Fatigue stress concentration factor
iv. Notch sensitivity
v. Endurance limit 10M
b) With sketches explain the methods of reducing the stress concentration 5M
4. a) Define the following with respect to fatigue strength:
i. Reversed load
ii. Repeated load
iii. Fluctuating load 6M
b) Derive Goodman’s equations for ductile and brittle material subjected to fluctuating stresses. 9M
Unit – III :
5. a) A circular shaft 50mm in diameter is welded to a support by means of a fillet weld as shown in Fig.1. Determine the size of the weld, if the permissible shear stress in theweld is limited to 100N/mm2. Fig.1 10M
b) Write a short note on strength of welded joints.5M
6. The structural connection as shown in Fig.2, is subjected to eccentric force P of 10KN with an eccentricity of 500mm. The center distance between bolts 1 and 2 is 200mm and the center distance between bolts 1 and 3 is 150mm. all bolts are identical. The bolts are made from plain carbon steel30C8 and the factor of safety is 2.5. Determine the size of the bolts. 15M
Unit – IV :
7. a) Prove that a square key is equally strong in crushing and in shear. 5M
b) Design a socket and spigot type cotter joint to connect two rods subjected to a steady axial pull of 100kN. The material used for spigot end, socket end and the cotter is C40 (40C8) steel having tensile yield strength of 328.6MPa. Take factor of safety as 4 for tension, 6 for shear and 3 for crushing based on the tensile yield strength. 10M
8. A section of steel shaft of 2 meters long supported between bearings carries a pulley of diameter 600mm weighing 1KN at its midpoint. The pulley delivers power to a machine causing a tension of 6KN in the tight side of the belt and 3KN in the slack side. The belt drive is horizontal. Assume the loads are steady, determine the diameter of the shaft, if the allowable shear stress in the shaft material is 40Mpa. 15M
Unit – V :
9. a) A rigid coupling is used to transmit 50kw of power at 300 rpm. There are six bolts. The outer diameter of flanges is 200mm while the recess diameter is 150mm. The coefficient of friction between the flanges is 0.15. The bolts are made of steel 45C8 (Syt = 380N/mm2) and the factor if safety is 3. Determine the diameter of the bolts.10M
b) What are the different types of couplings available and state the applications of them. 5M
10. A semielliptical laminated spring is to carry a load of 5000N and consists of 8 leaves, 46mm wide, two of the leaves being of full length. Spring is to be made 1000mm between the eyes and is held at the centre by a 60mm wide band. Assume that the spring is initially stressed so as to induce an equal stress of 500 N/mm2 when fully loaded. Design the spring giving i) thickness of leaves ii) eye diameter iii) length of leaves iv) maximum deflection and camber. Assume E= 2.1x 106N/mm2. 15M