100 Machine Design Technical Questions


  1. What is standardization ?
  2. What are preferred number ?
  3. Define ergonomics
  4. What is creep ?
  5. What is tolerance ?
  6. What is fit ?
  7. What are types are tolerance ?
  8. What are unilateral and bilateral tolerances ?
  9. What is clearance fit ? Give its examples.
  10. What is transition fit ? Give its examples.
  11. What is interference fit ? Give its examples.
  12. What is shaft basis system for giving tolerances ?
  13. What is hole basis system for giving tolerances ?
  14. Give the steps involved in design process.
  15. What are the advantages of hole basis system over shaft basis system ?
  16. What is fundamental deviation ?
  17. What is selective assembly ?
  18. Distinguish between interchangeable and selective assemblies.
  19. Explain the symbol for surface roughness.
  20. What is factor of safety ?
  21. Why it is necessary to use factor of safety ?
  22. What is stress concentration ?
  23. What are the causes of stress concentration ?
  24. What are the methods of reducing stress concentration ?
  25. What is fatigue failure ?
  26. What are the machine components that fail by fatigue ?
  27. What is endurance limit ?
  28. What is fatigue life ?
  29. What is notch sensitivity ?
  30. What are the factors that affect endurance limit of a machine part ?
  31. What is power screw ?
  32. What are the applications of power screw ?
  33. What is "overhauling" of power screw ? State condition for overhauling.
  34. What is "self locking" of power screw ? State condition for self locking.
  35. State the applications where self locking is essential.
  36. What is stud ?
  37. Why is hexagonal head preferred for cap screw instead of square head ?
  38. What is bolt of uniform strength ?
  39. What are the four basic elements of weld symbol ?
  40. Why are riveted joints replaced by welded joints ?
  41. How is rivet specified ?
  42. What is the common material for rivet ?
  43. What is caulking ? What is its objective ?
  44. What is fullering ? What is its objective ?
  45. What is the function of transmission shaft ?
  46. What is fillet ? Why it is provided for shaft ?
  47. What are the types of stresses induced in shafts ?
  48. Which theories of failure are applicable for shafts ? why ?
  49. Define equivalent torsional moment and equivalent bending moment.
  50. What do you understand by torsional rigidity ?
  51. What do you understand by lateral rigidity ?
  52. What is the permissible shear stress as per the ASME code ?
  53. What are splines ? Where do you use them ?
  54. What is the difference between the coupling and clutch ?
  55. What are the functions of spring ?
  56. What is the spring index ?
  57. What is stiffness of spring ?
  58. What is surge in spring ?
  59. Why belt drives are called flexible drives ?
  60. State the law of belting.
  61. What is belt rating ?
  62. What is creep in belts ?
  63. What is standard value of belt angle in V-belt ?
  64. How will you designate V-belt ?
  65. What is the standard value of groove angle for V-pulley ?
  66. What is polygonal action in roller chain ? How will you reduce it ?
  67. What are the types of failure in roller chains ?
  68. What are the functions of bearings ?
  69. What are the applications of sliding contact bearings ?
  70. What are the applications of the rolling contact bearing ?
  71. Why ball and roller bearings are called 'antifriction' bearings ?
  72. Why taper roller bearing are used in pairs ?
  73. Define static load carrying capacity of bearing.
  74. What is L10 and L60 life of bearing ?
  75. What are the objectives of lubrication ?
  76. What is thick film lubrication ?
  77. What is zero film bearing ?
  78. What is hydrostatic and hydrodynamc lubrication ?
  79. Why hydrodynamic bearings are called as 'self-acting' bearings ?
  80. Why hydrostatic bearings are called as 'externally pressurized' bearings ?
  81. Define Viscosity.
  82. State Newton's law of viscosity.
  83. Why does viscosity decreases with increase in temperature ?
  84. What is viscosity index ?
  85. State desirable properties of good bearing material.
  86. What is SAE ?
  87. What is purpose of additive ?
  88. In gear speed reducer, why is the diameter of an output shaft is greater than that of input shaft ?
  89. What is herringbone gear ?
  90. State important reasons for adopting involute curve for gear tooth profile.
  91. What is full depth involute gear tooth system ?
  92. What is pitting and scoring ?
  93. What is hunting tooth ?
  94. Where do you use grease as gear lubrication ?
  95. What is  virtual or formative helical gear ?
  96. What is crown gear ?
  97. What is miter gear ?
  98. State the material for worm and worm wheel \.
  99. Where do you use worm gear ?
  100. Where do you use bevel gear ?
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Sujit Kadus

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