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Mechanical Engineering :: Strength of Materials

  1. A bar of copper and steel form a composite system, which is heated to a temperature of 40°C. The stress induced in the copper bar will be

  2. A.
    tensile
    B.
    compressive
    C.
    shear
    D.
    zero

  3. In the below figure, the point C represents

  4. A.
    elastic limit
    B.
    upper yield point
    C.
    lower yield point
    D.
    breaking point

  5. Two closely-coiled helical springs 'A' and 'B' of the same matenal, same number of turns and made from same wire are subjected to an axial load W. The mean diameter of spring 'A' is double the mean diameter of spring 'B'. The ratio of deflections in spring 'B' to spring 'A' will be

  6. A.
    1/8
    B.
    1/4
    C.
    2
    D.
    4

  7. Two shafts 'A' and 'B' have the same material. The shaft 'A' is solid of diameter 100 mm. The shaft 'B' is hollow with outer diameter 100 mm and inner diameter 50 mm. The torque transmitted by shaft 'B' is __________ as that of shaft 'A'.

  8. A.
    1/6
    B.
    1/8
    C.
    1/4
    D.
    15/16

  9. The tensile strength of the welded joint for double fillet is (where s = Leg or size of the weld, l = Length of weld, and σt = Allowable tensile stress for weld metal)

  10. A.
    0.5 s.lt
    B.
    s.lt
    C.
    2 s.lt
    D.
    2.s.lt

  11. A double strap butt joint with equal straps is

  12. A.
    always in single shear
    B.
    always in double shear
    C.
    either in single shear or double shear
    D.
    none of these

  13. At the neutral axis of a beam

  14. A.
    the layers are subjected to maximum bending stress
    B.
    the layers are subjected to minimum bending stress
    C.
    the layers are subjected to compression
    D.
    the layers do not undergo any strain

  15. The line of intersection of the neutral layer with any normal cross-section of the beam is called neutral axis.

  16. A.
    True
    B.
    False

  17. In a thick cylindrical shell subjected to an internal pressure (p), the maximum radial stress at the inner surface of the shell is

  18. A.
    zero
    B.
    p (tensile)
    C.
    -p (compressive)
    D.
    2p (tensile)

  19. Shear strength of the welded joint for double parallel fillet is (where τ = Allowable shear stress for weld metal)

  20. A.
    0.5 s.l
    B.
    s.l
    C.
    2 s.l
    D.
    2.s.l