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Mechanical Engineering :: Machine Design

  1. In case of thick cylinders, the tangential stress across the thickness of cylinder is

  2. A.

    maximum at the outer surface and minimum at the inner surface

    B.

    maximum at the inner surface and minimum at the outer surface

    C.

    maximum at the inner surface and zero at the outer surface

    D.

    maximum at the outer surface and zero at the inner surface


  3. When an open coiled helical compression spring is subjected to an axial load (W), the compression produced in the spring will be (where n = No. of active turns of the spring, and G = Modulus of rigidity for the spring material)

  4. A.

    \(\frac { 2 WD^3 n } { G d^4 }\)

    B.

    \(\frac { 4 WD^3 n } { G d^4 }\)

    C.

    \(\frac { 8 WD^3 n } { G d^4 }\)

    D.

    \(\frac { 16 WD^3 n } { G d^4 }\)


  5. The cam follower generally used in automobile engines is

  6. A.

    knife edge follower

    B.

    flat faced follower

    C.

    spherical faced follower

    D.

    roller follower


  7. A closely coiled helical spring is acted upon by an axial force. The maximum shear stress developed in the spring is Ï„ . The half of the length of the spring if cut off and the remaining spring is acted upon by the same axial force. The maximum shear stress in the spring in new condition will be

  8. A.

    τ/2

    B.

    τ

    C.

    2 τ

    D.

    4 τ


  9. The malleable material should be plastic but is not essential to be so strong.

  10. A.

    Agree

    B.

    Disagree