Que: Cold working produces the following effect (Engg services 2003)

1. Stresses are set up in the metals.
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

Ans: (a)