Question

In construction work, the alloy duralumin is used rather than pure Aluminium because:
(A) duralumin is light and strong
(B) duralumin is corrosion resistant
(C) duralumin has high tensile strength
(D) All of these.

Answer 1

Hint: In order to know why the alloy of Aluminium that is duralumin is used in the construction purposes rather than the pure Aluminium, we must first know about the duralumin and its properties.

Complete Solution : Let us first understand about duralumin. Duralumin is the trade name for the aluminium alloy. The other chemical elements present in this alloy are copper, manganese and magnesium. Duralumin is very strong and is a very lightweight alloy of aluminium. It is soft, ductile and easily workable. The tensile strength of duralumin is higher than that of aluminium. It will be having a poor resistance to corrosion. Duralumin is having a very poor electrical and heat conductivity compared to aluminium. Duralumin will be having a very low melting point because of which it can be easily forged, casted and worked. Because of all the above given properties duralumin is used for the construction work rather than the pure aluminium.
So, the correct answer is “Option D”.

Note: Let us see what are different uses of duralumin:
- Duralumin is used in vehicle armor in the defense industry.
- It is used in aviation applications.
- Duralumin is mainly used in places where good strength is required. Hence it is used mainly in bar, rod and wires.
- For the manufacture of the measuring instruments.