1. The NDT technique used to detect deep lying defects in a large sized casting is
2. Match the technique for proper distinction between the two :
P. Soft and hard magnets
1. Optical microscopy
Q. Amorphous and crystalline materials
2. Hall effect measurement
R. n and p-type semi-conductors
3. X-ray diffraction
S. Cast and wrought alloys
4. Magnetic hysteresis
| P. Soft and hard magnets | 1. Optical microscopy |
| Q. Amorphous and crystalline materials | 2. Hall effect measurement |
| R. n and p-type semi-conductors | 3. X-ray diffraction |
| S. Cast and wrought alloys | 4. Magnetic hysteresis |
3. Which is the process by which screw dislocation may not leave slip plane?
4. The crack which propagates through the grain is
5. Match the defects given in Group I with the suitable non-destructive evaluation technique from Group II.
Group I
Group II
P. Crack in a flat aluminium slab
1. Radiography
Q. Sub-surface porosity in a bronze casting
2. Eddy current technique
R. Surface cracks in a steel tool
3. Ultrasonic technique
S. Internal porosity in a ceramic block
4. Magnetic particle technique
| Group I | Group II |
| P. Crack in a flat aluminium slab | 1. Radiography |
| Q. Sub-surface porosity in a bronze casting | 2. Eddy current technique |
| R. Surface cracks in a steel tool | 3. Ultrasonic technique |
| S. Internal porosity in a ceramic block | 4. Magnetic particle technique |
6. A wire is stretched 3 mm by a force of 150 N. Assuming the elastic limit is not exceeded, ther stretch for 450N is:
7. Demagnetization, ASTM E709-95 recommends a coil of ampere-turns:
8. Why might steel parts have a greater tendency towards rusting after penetrant testing?
9. In the X-ray radiography technique the tube voltage for thicker plates as compound to the thin plates, should be
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