question_answer

Consider the following work materials:

1. Titanium

2. Mild steel

3. Stainless steel

4. Grey cast iron.

The correct sequence of these materials in terms of increasing order of difficulty in machining is:

A) 4, 2, 3, 1                      

B) 4, 2, 1, 3

C) 2, 4, 3, 1                      

D) 2, 4, 1, 3