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VASAVI COLLEGE OF ENGINEERING HyderabadDepartment of Mechanical Engineering

B.E. 3/4 (Prod.) I SemesterQuestion Bank

Subject: Design of Machine Elements

Prepared By: S.L.V. Prasad, Asst. Prof

SET: 1Topics: DESIGN FUNDAMENTAS,

DESIGN FOR STATIC LOADSDESIGN FOR FLUCTUATING LOADS

1. What are the various phases of design process?2. Define: Factor of safety3. What are the different types of loads that can act on machine components?4. What are the types of variable stresses?5. Differentiate between repeated stress and reversed stress.6. What is impact load?7. Define endurance limit.8. What are the factors affecting endurance strength.9. What are the types of fracture?10. Distinguish between brittle fracture and ductile fracture.11. What are the modes of fracture?12. Explain Griffith theory. (Or) State the condition for crack growth.13. Define stress concentration and stress concentration factor.14. Give some methods of reducing stress concentration.15. What are the factors to be considered in the selection of materials for a

machine element?16. Why are metals in pure form are unsuitable for industrial use?17. What are various theories of failure?18. What is the use of Goodman & Soderberg diagrams?19. Explain notch sensitivity. State the relation between stress concentration

factor, fatigue stress concentration factor and notch sensitivity.20. What are the factors that effect notch sensitivity?21. Explain size factor in endurance strength.22. What is an S-N Curve?23. Why normal stress theory is not suitable for ductile materials?24. What are the methods used to improve fatigue strength25. Define strength.

26. Define stiffness27. Define elasticity28. Define plasticity29. Define Ductility30. Define brittleness31. Define malleability32. Define toughness33. Define machinability34. Define resilience35. Define creep36. Define fatigue

37. Define hardness38. What is interchangeable manufacture?39. Define: Tolerance40. Define deviation

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41. Define zero line42. Explain hole basis system and shaft basis system.43. Why hole basis system is preferred?44. Define fit45. What are the factors that influence the amount of tolerances to be given on a

part?46. What are preferred numbers? What is the advantage of using them?47. Define Lay48. State the methods used for roughness measurement49. What is MMC? How is it indicated on surface texture?50. Define basic size51. Define actual size52. Define limits of size53. Define Allowance54. Explain the types of fit.55. Define unilateral tolerance56. Define bilateral tolerance

57. Define clearance fit:58. Define interference fit59. Define transition fit

SET: 2Topics: BOLTED JOINTS,

RIVETED JOINTS,WELDED JOINTS

60. Define: Pitch, Lead.61. How is a bolt designated?62. What factors influence the amount of initial tension?63. What is bolt of uniform strength?64. What are the ways to produce bolts of uniform strength?65. What stresses act on screw fastenings?66. Define welding.67. What are the types of welded joints?68. Define butt and lap joint69. Define: Tee joint and corner joint.70. Define edge joint71. When will the edge preparation need?

72. What are the two types of fillet weld?73. When will the weld deposit be weaker?74. What are the two types of stresses are induced in eccentric loading of loaded

joint?75. State the two types of eccentric welded connections.76. What is the significance of welding specification?77. What are the main indications of complete weld symbol?78. What are the various parts of rivet?79. What are the materials used for making rivets?80. What are the applications of rivets?81. What are the different working processes used for making riveting?82. What are the types of riveted joints according to the type of joint?

83. What are the types of riveted butt joints according to the number of strap?84. What are the types of riveting?85. Define Gauge line

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86. Define the efficiency of a riveted joint.87. Define longitudinal joint88. Define circumferential joint.89. What does a rivet mean?90. What are the two types of fastenings?

91. What is a permanent fastening? Give example?92. What is a temporary fastening? Give example.93. What are the methods of riveting?94. What does cold riveting mean?95. What is meant by hot riveting?96. What are the applications of cold and hot riveting?97. What are the types of riveted joints depending upon the way in which the

plates are connected?98. What is meant by a lap joint?99. What is meant by a butt joint?100. What are the types of butt joint?101. What are the types of riveted joints depending upon the number of rows of

rivets?102. What is meant by pitch in a riveted joint?103. What is meant by back pitch in a riveted joint?104. What is meant by diagonal pitch in a riveted joint?

105. What is meant by margin or marginal pitch in a riveted joint?106. What are the types of failures in riveted joints?107. What are the advantages of welded joints over riveted joints?108. What are the disadvantages of welded joints?109. How are welding processes classified?110. What are the different methods of fusion welding?111. What are the different types of welded joints?112. What are the different types of butt joints?113. What are the main considerations involved in selection of weld type?114. What are the different applications of screwed fasteners?115. What are the advantages of screwed fasteners? .116. What is the disadvantage of screwed fasteners?117. Define major diameter of screwed fasteners118. Define minor diameter.119. Define pitch diameter.120. Define pitch.121. Define lead.122. Define the terms 1) crest 2) root

123. Define the terms 1) depth of thread 2) flank124. Define angle of thread of screw fasteners125. Define slope of a screw of a screw thread.126. What are the various forms of screw threads?127. What are the common types of screw fastening?128. Why do we go for locking devices in screwed fasteners?129. What are the different types of locking devices?130. What does a bolt M24 x2 mean?131. What are the stresses induced in screw fastening due to static loading?132. What are the stresses induced in a bolt when it is screwed up tightly?

133. What are the stresses induced in a bolt when it is subjected to external

forces or loads?

SET: 3

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Topics: SHAFTS,KEYSSHAFT COUPLINGS

134. Define the term critical speed.

135. Write down the dunker leys equation for the critical speed of the shaft.136. What is key?137. What are the types of keys?138. What is the main use of woodruff keys?139. List the various failures occurred in sunk keys.140. What is the function of a coupling between two shafts?141. Under what circumstances flexible couplings are used?142. What are the purposes in machinery for which couplings are used?

SET: 4Topics: BELTS AND PULLEYS,

CHAIN DRIVES WIRE ROPES

143. Name the four types of belts used for transmission of power.144. Differentiate between open drive and cross drive of a belt drive.145. Why are idler pulleys used in a belt drive?146. When do you use fast and loose pulley drive?147. When do you use stepped pulley drive?148. Define velocity ratio of a belt drive.149. What is meant by ply in a flat belt?150. What is initial tension in belt drives?151. What type of belt would you prefer if the centre distance between the pulleysis small?152. State reasons for V-belt drive being preferred to flat belt drive?153. Why slip is less than in case of V-belts when compared with flat belts?154. What are the different cross sections of a V-belt ?155. How can you specify V-belts?156. What is a V-flat drives?157. What are the materials used for V-grooved pulleys?158. What is the included angle for the V-belt usually?159. When do you prefer a wire rope drive?160. Write any four wire rope applications.161. What are the advantages of wire ropes?162. Distinguish regular-lay and lang-lay ropes.

163. How are wire ropes designated?164. What do you understand by 6 x 19 construction in wire ropes?165. Ropes fail mainly by _________ and ______________166. When do you prefer a chain drive to a belt or rope drive?167. The limiting speed of a chain drive is __________168. Give any three applications of chain drives.169. What are the different types of chains?170. How can you specify a link chain?171. What are the possible ways by which a chain drive may fail?172. What is back sliding in chain drives?173. What is a silent chain? In what situations, silent chains are preferred?