Which of the following is not a cupro-nick-el alloy ?

ANS:C - Muntz metal

Muntz metal is a type of brass alloy that is primarily composed of copper and zinc, with small amounts of other elements. It typically contains around 60-70% copper and 30-40% zinc, although the exact composition may vary depending on the specific application. The addition of zinc to copper in Muntz metal provides several beneficial properties, including improved strength, corrosion resistance, and machinability. These characteristics make Muntz metal suitable for various applications, particularly in marine environments where resistance to corrosion from seawater is essential. Muntz metal is named after its inventor, George F. Muntz, who patented the alloy in 1832. It was originally developed as a cost-effective alternative to copper for sheathing the hulls of ships. The use of Muntz metal in marine applications became widespread during the 19th century due to its favorable combination of properties and relatively low cost compared to pure copper. In addition to marine applications, Muntz metal has been used in various other industries, including architecture, plumbing, and electrical engineering. It is commonly found in fittings, fasteners, screws, bolts, and other components where its corrosion resistance and strength are advantageous. Overall, Muntz metal is a versatile brass alloy that offers a balance of properties suitable for a range of applications, particularly those requiring resistance to corrosion and mechanical strength.