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ME-602 · Machine Component and Design/Unsolved PYQ Paper

ME-602 Machine Component and Design - Jun 2025 Question Paper

  1. 7 Marks
    aExamine the Goodman and Modified Goodman diagrams. How do they assist engineers in the design of components subjected to fluctuating stresses?
  2. 7 Marks
    bWhat is meant by stress concentration? How do you take it into consideration in case of a component subjected to dynamic loading?
  3. 7 Marks
    aWhat methods can be used to reduce stress concentration in engineering components? Explain with suitable examples.
  4. 7 Marks
    bDescribe the S-N curve and its importance in fatigue design. How does it help in determining the fatigue life of a material?
  5. 14 Marks
    A line shaft rotating at 200 r.p.m. is to transmit 20 kW. The allowable shear stress for the material of the shaft is 42 MPa. If the shaft carries a central load of 900 N and is simply supported between bearing 3 metre apart, determine the diameter of the shaft. The maximum tensile or compressive stress is not to exceed 56 MPa.
  6. 7 Marks
    aCompare the advantages and disadvantages of a saddle key and a sunk key. When should each be used?
  7. 7 Marks
    bA hollow shaft is to transmit a uniform torque of 30 kNm. The total angular twist in 2.5m length of the shaft is not to exceed 2 degree and the allowable shearing stress is 85 MPa. Determine the external and internal diameters of the shaft. Take modulus of rigidity of the shaft material as 80 GPa.
  8. 7 Marks
    aClassify springs according to their shapes. Draw neat sketches indicating in each case whether stresses are induced by bending or by torsion.
  9. 7 Marks
    bA weight of 200N is dropped on to a helical spring made of 15 mm wire closely coiled to a mean diameter of 120 mm with 20 coils. Determine the height of drop if the instantaneous compression is 80 mm. Assume: C = 84 GN/m$^2$.
  10. 7 Marks
    aWhat are the important properties of materials used for friction surfaces in clutches and brakes? Give examples of commonly used materials.
  11. 7 Marks
    bExplain the working of a centrifugal clutch. What are the key design parameters that influence its performance?
  12. 7 Marks
    aWhat are the essential physical properties of a good bearing material? Additionally, explain the concept of the bearing characteristic number.
  13. 7 Marks
    bA footstep bearing supports a shaft of 150 mm diameter which is counter bored at the end with a hole diameter of 50 mm. If the bearing pressure is limited to 0.8 N /mm$^2$ and the speed is 100 r.p.m. Find: i) The load to be supported ii) The power lost in friction
  14. 14 Marks
    Write short notes on the following:- a) Polar Modulus of Shaft b) Bearing Life c) Internal Expanding Brakes d) Dimensionless numbers
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