question_answer

Cold working produces the following effects:

1. Stresses are set up in metal

2. Grain structure gets distorted

3. Strength and hardness of the metal are decreased

4. Surface finish is reduced

Which of these statements are correct?

A) 1 and 2            

B) 1, 2 and 3

C) 3 and 4            

D) 1 and 4.