Question

Electrical fittings are generally made of:
A. German silver
B. Brass
C. Bronze
D. Gun metal

Answer 1

Hint: Electrical fittings are the systems which are utilised for protecting and routing the electrical cable and wiring. The material used in electrical fitting should be resistant to corrosion, and should be ductile.

Step by step answer: To avoid the striking of sparks. The electrical fittings are generally made up of brass The various properties of brass like resistance to corrosion, machinability, ductility etc. make it suitable for making electrical fittings. Also, brass has a fair tensile strength due to which it is preferred for making various appliances.
Brass is a substitutional alloy made up of copper and zinc. Generally, it consists of $67\mathrm{\%}$ copper and $33\mathrm{\%}$ zinc. To improve the machinability of the brass a very small amount of lead is also added to it sometimes. A substitutional alloy is an alloy in which the atoms of the two constituents are able to replace each other within the same crystal structure. Brass has a very unique property that makes it one most preferred alloys is that it does not lose its properties. Also the high electrical and thermal conductivity of the brass make it suitable for various industries. It is highly malleable i.e. it has the ability to be moulded and casted easily. Unlike various metals the brass does not tend to wear off with time due to its anti-corrosive nature. It also resists galvanic corrosion from saltwater.

Hence, option (B) brass, is the correct option.

Note: Brass a binary alloy made up of copper and zinc is used for making electrical fittings. It is a substitutional alloy with various properties that make it suitable for such purposes. They are; resistance to corrosion and spark, machinability, ductility, thermal and electrical conductivity, malleability, great tensile strength, etc.