1. The joint is not heated to a state of fusion. |
2. No pressure is used. |
3. Oxygen is stored in steel cylinder at a pressure of 14 MPa |
4. When there is an excess of acetylene used, there is decided change in the appearance of flame. |
A) 1, 2 and 3
B) 2, 3 and 4
C) 1, 3 and 4
D) 1, 2 and 4
Correct Answer: B
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