Aviation Materials Quiz

What is the primary characteristic of non-ferrous metals used in aircraft?

• They have iron as their base element.

• They are primarily composed of iron.

• They have elements other than iron as their base.

• They are not used in aircraft construction.

Why is aluminium considered vital in the aviation industry?

• It is the heaviest metal used in construction.

• It has a low resistance to corrosion.

• It has a high strength to weight ratio and ease of fabrication.

• It is non-malleable and non-ductile.

How can the tensile strength of commercially pure aluminium be increased?

• By reducing its temperature.

• By rolling or other cold working processes.

• By increasing its malleability.

• By decreasing its ductility.

What is the primary advantage of the permanent mold process over sand casting in aluminum alloy production?

• It allows for more complex shapes.

• It results in fewer openings (porosity) in the castings.

• It is more cost-effective.

• It requires less heat treatment.

How are casting alloys identified in terms of their composition?

• By the color of the alloy.

• By a letter preceding the alloy number.

• By the weight of the alloy.

• By the temperature at which they melt.

What are the two principal types of sand-casting alloys mentioned in the document?

• 7075 and 2024

• 112 and 212

• 355 and 356

• 6061 and 6063

What is the main difference between sand and permanent mold castings?

• The type of metal used.

• The method of pouring the metal.

• The material from which the molds are made.

• The temperature at which the metal is poured.

What are the two specific types of permanent mold castings?

• Permanent metal mold with metal cores and semi-permanent types containing sand cores

• Permanent metal mold with sand cores and temporary types containing metal cores

• Semi-permanent types with plastic cores and temporary types with metal cores

• Permanent plastic mold with metal cores and semi-permanent types containing plastic cores

Why are permanent mold castings superior to sand type castings?

• They produce finer grain structure due to rapid cooling

• They are cheaper to produce

• They require less material

• They are easier to mold

Which alloys are commonly used in permanent mold castings for internal combustion engines?

• Alloys 122, A132, and 142

• Alloys 101, B202, and 303

• Alloys 150, C250, and 350

• Alloys 200, D300, and 400