CD CD Drafter Materials & Manufacturing Processes

Question 1

Which material property describes a metal's ability to be drawn into a wire without breaking?

Accepted Answer

Ductility

Answer

Ductility is the property that allows a material to be drawn into a wire or stretched without fracturing.

Question 2

On a technical drawing, a surface finish symbol with a value of 125 µin Ra indicates:

Accepted Answer

A relatively smooth machined surface

Answer

125 µin Ra is a standard machined surface finish commonly used for general-purpose machined parts.

Question 3

Which manufacturing process uses a rotating cutting tool to remove material from a stationary workpiece?

Accepted Answer

Milling

Answer

Milling uses a rotating multi-tooth cutter to remove material while the workpiece is fed into it.

Question 4

What does the abbreviation 'HR' indicate when specified next to a material designation on a drawing?

Accepted Answer

Hot Rolled

Answer

HR stands for Hot Rolled, indicating the steel was processed above its recrystallization temperature.

Question 5

A casting process that forces molten metal into a reusable steel mold under high pressure is called:

Accepted Answer

Die casting

Answer

Die casting injects molten metal into permanent steel dies under high pressure, producing dimensionally accurate parts.

(CD) Certified Drafter Practice Test