Machine Design Miscellaneous

Machine Design Miscellaneous

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Machine Design

Machine Design Miscellaneous
  1. The primary and secondary shear loads on bolt P, respectively, are








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    Let F1 and F2 resist the 4 kN eccentric load. The primary shear load is due to a direct shear stress of 4kN, which is equally divided amongst the two bolts, i.e. 2 k N,
    ∴  Fprimary on P = 2 kN

    The secondar y load is t o r esist t he moment produced by the eccentric load 4 kN about the C. G. of the joint
    Moment   M = 4 kN × 2000 mm
          = 8000 Nm
    Now this moment must be balanced by a moment pr oduced by equal and opposite forces i .e. secondary loads on the bolts
    i .e.     F × 400 = 800 Nm
    ⇒  F = 20 kN

    Correct Option: A

    Let F1 and F2 resist the 4 kN eccentric load. The primary shear load is due to a direct shear stress of 4kN, which is equally divided amongst the two bolts, i.e. 2 k N,
    ∴  Fprimary on P = 2 kN

    The secondar y load is t o r esist t he moment produced by the eccentric load 4 kN about the C. G. of the joint
    Moment   M = 4 kN × 2000 mm
          = 8000 Nm
    Now this moment must be balanced by a moment pr oduced by equal and opposite forces i .e. secondary loads on the bolts
    i .e.     F × 400 = 800 Nm
    ⇒  F = 20 kN

  1. The yield strength of a steel shaft is twice its endurance limit. Which of the following torque fluctuations represent the most critical situation according to Soderberg criterion?








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    τa
    		 +
    τm
    		 =
    1
    SeSyFos

    τa
    		 +
    τm
    		 =
    Se
    12Fos

    τa is highest in (a)

    Correct Option: A

    τa
    		 +
    τm
    		 =
    1
    SeSyFos

    τa
    		 +
    τm
    		 =
    Se
    12Fos

    τa is highest in (a)

  1. Fatigue strength of rod subjected to cyclic axial force is less than that of a rotating beam of the same dimensions subjected to steady lateral force. [True/ False]








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    True

    Correct Option: C

    True

  1. In a shaft with a transverse hole, as the hole to the shaft diameter ratio_____(increase/ decrease), the torsional stress concentration factor ______ (increases/ decreases)








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    Increase, decreases

    Correct Option: A

    Increase, decreases

  1. The piston rod of diameter 20 mm and length 700 mm in a hydraulic cylinder is subjected to a compressive force of 10 kN due to the internal pressure. The end conditions for the rod may be assumed as guided at the piston end and hinged at the other end. The Young's modulus is 200 GPa. The factor of safety for the piston rod is








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    NA

    Correct Option: C

    NA