question_answer

Which of the following are the characteristics of cold working of metals?

1. Stresses are set up in the metal that remain unless removed by subsequent heat treatment

2. Coarse grains are refined

3. Strength and hardness are increased.

Select the correct answer using the code given below:

A) 1 and 2 only     

B) 1 and 3 only

C) 2 and 3 only       

D) 3 only