Correct Answer - Option 1 : nickel
Explanation:
Tensile Strength:
The tensile strength of a material is the maximum amount of tensile stress that it can take before failure.
\(Tensile\;Strength = \frac{{Maximum\;Load}}{{{\rm{area\;of\;original\;cross\;section}}}} = \frac{{{P_{Maximum}}}}{{{A_{original}}}}\)
Nickel
- It is a hard and lustrous white metal which possess good corrosion and oxidation resistance. It has a high tensile strength of 450 MPa.
Mild steel:
- Mild steel or medium carbon steels have a carbon concentration between about 0.25 and 0.60 wt%.
- These alloys are most often used in tempered conditions, having microstructures of tempered martensite.
- The addition of chromium, nickel, and molybdenum improve the capacity of these alloys to be heat treated which gives the variety of strength and ductility combinations.
- Mild steel has a tensile strength ranging from 430 MPa for plain carbon steel to 1860 for alloy steel.
Aluminium:
- Aluminium is light in weight and is having good conductivity.
- But it is having very low tensile strength.
- To make it suitable to be used as a conductor for the transmission line, we need to increase its tensile strength.
- To increase the tensile strength, steel is used as the core of the conductor.
Copper:
- Tensile strength of Copper is 260 MPa
| Elements |
Tensile strength |
| Nickel |
450 MPa |
| Aluminium |
90 MPa |
| Copper |
260 MPa |
| Mild steel |
430 MPa |
