Basics in Aerospace Materials Processes : Practice MCQ Questions & Answers with Explanations

Gun-metal includes around 86-89 per-cent of copper. It is also made of various elements like zinc, tin, lead, copper, etc. Gun-metal contains around 86-89% per-cent of copper and a maximum of 2 per-cent of lead.

Red brass is made of several components that include zinc, copper, tin phosphorus, iron, etc. Red brass contains around 4-6% of zinc. It is also made of approximately 0.75% phosphorus and 4-6% of tin.

Gun-metal is an alloy metal that cannot be used at all temperatures. More specifically, gun-metal should not be utilized in temperatures above 260°C. For certain components, it cannot be annealed as well.

There are different types of bronzes based on their composition. Aluminium bronze is a kind of bronze where aluminium is one of the dominant elements.

Naval brass is an alloy that in some considerations, is better than commercial brass. Naval brass has better strength when compared to commercial brass. It also has greater corrosion resistance than commercial brass.

Gun-metal casting has a yield point of 15,000 pound-force per square inch. Gun-metal (castings) also have a UTI (Ultimate tensile strength) of around 30,000 pound-force per square inch.

Naval brass consists of around 0.2 per-cent lead. It also contains approximately 0.10 per-cent iron. Naval brass also has some impurities present that account for about not more than 0.1 per-cent.

Gun-metal is an alloy that is made/consists of several components in varying quantities. Gun-metal contains around 1 to 3 per-cent of zinc. It also contains approximately 9 to 11 per-cent of tin.

Naval brass is an alloy material. It is used in the manufacturing/making of several components like bolts, studs, nuts, etc. It also can be used in making components that come in contact with NaCl.

Bronze is a copper alloy that contains a large amount of tin. Bronze also contains smaller amounts of materials like lead, zinc, phosphorus, etc. They are different variations present depending on the composition.

Red brass is an alloy that is used in manufacturing components like fuel line fittings. It is a material that machines well. Apart from being used in fuel line fittings, it is also used in manufacturing oil line fittings.

Naval bronze is an alloy material. It is used in manufacturing several components due to its good properties, but it is not stronger than manganese bronze.

UTS refers to Ultimate tensile strength. Red brass (casting) has an ultimate tensile strength of 30,000 pound-force per square inch. Red brass is also an alloy that typically has good casting properties.

Red brass is an alloy that is also sometimes referred to as a bronze material due to its quantity of tin. Red brass contains around 0.25 per-cent of antimony and around 84 to 86 percent of copper.

Naval brass is also known as Tobin bronze. It has several qualities that are beneficial in the manufacturing and construction of aerospace components. Naval brass has wonderful machining qualities.

While considering the cost of shop equipment required, both the maintenance cost plus the initial cost of the material must be considered. This is an important economic consideration in the selection of materials used in the construction of an aircraft.

Machinability is the ease of cutting material. It is the change in the form of material along with being economically beneficial, at a low cost. The machinability of a material is a technological factor.

Color is the least considered factor in the selection of materials. The technological, physical and economic factors like melting point, weldability and availability are much more important as they affect safety and performance more. Also, materials can be colored according to requirements.

Standardization of materials is an advantage. It refers to using the available material in manufacturing different components, instead of stocking several materials that result in residual materials being left.

The capability to produce foam is called the foamability of a material. The ability of a material to be made into soldered joints easily is called solderability of a material. Both foamability and solderability are technological factors of a material.