Machining operations on metals such as drilling, lathe operation or milling typically involve the following:

In general abrasive cutting involves some abrasive material being moved across or rubbing against the workpiece to remove material. Indicate which of the following statements about abrasive cutting is correct.

What are the purpose of hammering on the steel and folding the steel over itself during hand forging, and eventually stretching out the steel to the desired geometry of the final product..

What is the purpose of the white powder being sprinkled on the hot metal during forging?

What is the white powder that is sprinkled on the metal during the hand forging process ?

Metal profiles can be formed by i) extrusion from billets,  by  ii) cutting,  bending sheet metal followed by seam welding or by  iii) rolling from blooms.

Aluminum profiles as shown below are usually made by 

SHS, CHS, RHS  profiles as shown below are usually made by 

External threads on bolt can be formed by cutting them on a lathe or using a die, or rolled in a cold forming process. Which of the statements below is correct.

For each of the statements below,  decide which process they are better associated with.

1) The amount of deformation possible is limited by the ductility of the material.

2) The process leaves the part in a work hardened state with elevated yield and ultimate strength but reduced ductility. 

3) The crystal grain sized are smaller in the finished product and could be aligned in certain directions, thus resulting in superior mechanical properties compared to other forming processes.  

4) Annealing can be done after forming to either increase ductility or prepare the part for another round of forming operations. 

5)  While forming, the workpiece is soft and malleable and there is no limit to the amount of deformation that can be done. 

Which are the following statements are correctly associated with automotive sheet metal stamping.