Q. During immersion ultrasonic testing of pipe or tubing, spurious echoes may be causedby: (Solved)
1. Dirt on the test piece
2. Grease on the test piece
3. Air bubbles on the test piece
4. All of the above
- d. All of the above
1. Dirt on the test piece
2. Grease on the test piece
3. Air bubbles on the test piece
4. All of the above