UT Level III Exam Paper 2012

UT Level III exam Paper 2012

1. Scanning Speed = 50 Cm LS : PRR = 500 PPS CM /Pm ? 50/500 = 0.1 2. Best Technique for ingot inspection = Squirter Bubbles 3. Casting Inspection for primary Detection = --- II -----4. Focal length in water = 15’’ , Specimen = 6’’ Required Focus = 3’’ Find the required focal length in water = ? =TmXVpm/Vw=13.5

AL

Water

5. Suitable coupling for rough surface testing – Wall paper pest 6. Lack or fusion in welding is scanned from other side – Sudden Drop in Amplitude 7. If counter bore is placed near to weld it seem to be like – LOF/LOP 8. Suitable for Bond testing – Leak Lamb wave testing 9. Required skip to cover weld toe – 1 full skip 10. Calibration block required for Tube testing – Notches at ID&OD with some gap 11. Suitable notch type for tube inspection – as per ASME sec. V 12. Max. Response received from SD or Notch – Notch 13. In amplitude block a#2 to get 70% FSH req. 24 dB. For a#4 required dB ? = 1.6db , 2. 18db , 3. 24db ? 14. Hole dia 1/64 & 3/64 ratio of Area ? 15. 6 dB is 2:1 ratio for 40 db = 100:1 16. To verify the surface reflective echo or depth echo – Cross check by finger damping 17. Which won’t Vibrate – Antinode 18. If PRF is high – Wrap around / ghosting 19. If incident angle is 8’ the generated shear wave angle will be – less than longitudinal 20. Why we should Automated inspection – For faster inspection 21. Main advantage for Automated – reduce human error 22. If high Scan is Required – Immersion testing 23. Purpose of EMAT in ingote inspection – High Temp / Non contact 24. Forging inspection through – Bubbler 25. Display used in Bond testing – RF ( unrectified) 26. RF signal is a – Unrectified signal 27. How to differentiate interference & Disbonding – Pulse & Amplitude 28. Ratio of change in Amplitude in two materials : Z ratio 29. Max impedance along with steel – Steel + Glass plate (check velocity of Impedance)

30.

1

2

3

water Composite material Reflector plate

Fig. 2 – Composite 31. L

S

Surface

Echo 1 is of – Longitudinal Waves

32. Unit of amplitude = dB decibel 33. Unit of Frequency = Hertz 34. Information required to select angle – thickness 35. Information to inspect composite bound - Adhesive Bond thickness 36. Flat probe in immersion concave object = beam converge 37. Method for bonding inspection – Pulse echo , Resonance , Multiple Echo , Acoustic 38. If a sudden drop in echo in through transmission – Check Couplent 39. Not considered in selection of calibration block materials – Test couplent 40. Focus probe is for – resolution 41. Echo is near zone varies due to – interference wave train 42. Initial echo shifted due to ( corrosion surface inspection) – Pitting (localised corrosion) 43. In service corroded pipe inspection ? = 44. How to indentify weld centre line (installed pipe) = Refer Drawing 45. Connectors = UHF

46. UT in casting – Low frequency probe 47. Why surface wave? - Good Sensitivity / resolution to surface regularity during rolling 48. Surface wave penetration : 1. Lamda (wavelength ) 2. On 49. Surface Wave Penetrate -1. λ( wave length) 2. Qu 50. Min. Thickness of defect for response = 1. λ 2. λ/2 3. 3/4 λ 51. Effect of Focussing probe on Near zone – Decreased NF 52. Index = nV2/V1 53. Surface Distance Achieved 8/8 Node 54. To obtain 5% , Db change required – 14Db 55.