It is undesirable to have residual stresses to a component t

It is undesirable to have residual stresses to a component that is expected to be under tensile stresses. Tensile stress Compressive stress Torsion stress None of the above In Cu-35% Zn decreases. Tensile strength Elongation Electrical conductivity None of the above Grain growth does not takes place in Welded alloys in the vicinity of the weld joint In heat affected zones Both A and B None of the above Strength in the heat affected zone Increases Remains constant Decreases First increases then decreases. Steel sample failed in brittle mode exhibit in scanning electron microscopy Striation Marks Cleavage fracture Dimples None of the above Steel samples failed in fatigue mode exhibit in scanning electron microscopy Striation Marks Cleavage fracture Dimples None of the above Steel samples failed in ductile mode exhibit in scanning electron microscopy Striation Marks Cleavage fracture Dimples None of the above Chevron Patterns are seen in f

Solution

7: A

When an external tensile stress is applied to the material, the crack tips concentrate stress, increasing the local tensile stresses experienced at the crack tips to a greater extent than the average stress.

8: C

Increase in cold working results in decrease of electrical conductivity.

9: C

10 : A

11. B

12 . A

13 . D

14. C