ME-602 Machine Component Design - May 2022 Question Paper

Under each question, How to answer lists the points an answer should cover, outlined by CampusPrep from the syllabus. Check the details against your textbook.

1. 7 Marks
   aList some factors that influence machine design.
   How to answer

   • Define machine design and its objective
   • List factors: loads, materials, manufacturing, safety, cost, ergonomics
   • Brief role of each factor
   • Effect on selection and dimensions
2. 7 Marks
   bWhat is 'Adaptive design and Optimum design'?
   How to answer

   • Define adaptive design
   • Define optimum design
   • Differentiating features and objectives
   • Example of each
3. 7 Marks
   aDistinguish between close coiled and open coiled springs.
   How to answer

   • Define close coiled vs open coiled spring with helix angle
   • Compare load type: axial vs axial plus bending
   • Compare stiffness and deflection formula
   • Applications of each
4. 7 Marks
   bWhat is interchangeable manufacturing?
   How to answer

   • Define interchangeable manufacturing
   • Need for limits, fits and tolerances
   • Role of standardization
   • Advantages: mass production, replacement
5. 7 Marks
   aWhat are unilateral and bilateral tolerances?
   How to answer

   • Define tolerance and its need
   • Explain unilateral tolerance with example
   • Explain bilateral tolerance with example
   • Sketch / representation difference
6. 7 Marks
   bDifferentiate between Hardness and Toughness of materials.
   How to answer

   • Define hardness and its measurement
   • Define toughness and its measurement
   • Compare properties, units and tests
   • Engineering significance
7. 7 Marks
   aDetermine the force required to punch a hole of 20 mm diameter in a 5 mm thick plate with ultimate shear strength of 250 MPa.
   How to answer

   • Formula for punching force $F = \pi d t \tau_u$
   • Substitute $d=20\,mm, t=5\,mm, \tau_u=250\,MPa$
   • Compute force in N/kN
   • State assumptions
8. 7 Marks
   bGive some methods of reducing stress concentration.
   How to answer

   • Define stress concentration
   • Methods: fillets, grooves, holes, material removal
   • Design guidelines for smooth flow
   • Illustrative sketches
9. 7 Marks
   aExplain notch sensitivity.
   How to answer

   • Define notch sensitivity $q$
   • Relation between $K_t, K_f$
   • Factors affecting sensitivity
   • Significance in fatigue design
10. 7 Marks
    bExplain stress concentration factor.
    How to answer

    • Define nominal vs maximum stress
    • Definition $K_t = \sigma_{max}/\sigma_{nom}$
    • Factors affecting $K_t$ and charts
    • Use in design
11. 7 Marks
    aClassify keys.
    How to answer

    • Define function of key
    • Classification: sunk, saddle, tangent, Woodruff etc.
    • Brief description of each type
    • Sketch of types
12. 7 Marks
    bDiscuss the forces acting on key.
    How to answer

    • Free body of key in shaft-hub
    • Tangential force due to torque
    • Shear and crushing / compressive forces
    • Design criteria for shear and crushing
13. 7 Marks
    aWhat is difference between rigid and flexible coupling?
    How to answer

    • Define rigid coupling purpose
    • Define flexible coupling purpose
    • Compare misalignment, construction, application
    • Examples of each
14. 7 Marks
    bWhy a hollow shaft has greater strength and stiffness than a solid shaft of equal weight?
    How to answer

    • Compare polar moment for equal weight
    • Outer material carries higher shear stress
    • Higher polar modulus and stiffness
    • Expression for torque and angle of twist
15. 7 Marks
    aHow are bearings classified?
    How to answer

    • Define bearing function
    • Classification by motion: rolling vs sliding
    • Classification by load: radial, thrust
    • Examples: ball, roller, journal, footstep
16. 7 Marks
    bWhat is a journal bearing? List any two applications.
    How to answer

    • Define journal bearing and construction
    • Working with hydrodynamic lubrication
    • List two applications e.g. crankshaft, turbines
    • Advantages