Argyll-Ruane Lid ona sant Ultrasonic Testing Question Paper - MC3 This column is for office use. Name: s[ Results: Signed: ce Marker 1 Date : : w[ Marker 2: 1. The refraction of an ultrasonic beam passing from one material to another is dependent upon: a. the velocity of sound in both materials, b. the test frequency. the crystal diameter d. Alllof the above. 2. The wavelength of a 5 MHz normal probe in ferritic steel is: a 1.19 m. b. 119 m. c. 11.9 mm. c d. 1.19 mm, 3, An increase in wave frequency when testing a steel weldment using a 70° s probe will result in igle crystal 4. an increase in sound velocity. b. decrease in sound velocity. c. no change in velocity d. no change in wavelength. 4. As the acoustic impedance ratio of two materials increases, the percentage of sound passing through the interface: a. decreases. b. increases. c. isnot changed. dd. may inerease or decrease. 5. Which of the following transducers produces the least beam spread in the far zone? a. 1 MHz, 10 mm diameter crystal. b. 5 MHz, 25 mm diameter crystal cc. 2MHz, 25 mm diameter erystal. d. 5 MHz, 10 mm diameter crystal.Argylle-Ruane Ltd ona sant 6. The maximum scanning speed possible is primarily determined by: the frequency of the crystal. the pulse repetition rate of the test instrument, friction considerations. crystal diameter. eeoe 7. The acoustic impedance of a material is determined by a. multiplying the sound velocity in the material by the density of the material. b. dividing the sound velocity in the material by the test frequency. c. multiplying the material's density by the wavelength of the ultrasound in the material. d, measuring the grain size of the material 8. Which of the following NDT methods is the best to use on welds on ferromagnetic materials? a, Magnetic particle testing b. Radiographic testing, c. Ultrasonic testing d. It depends on many factors, NDT methods are usually complimentary, 9. Which is the British Standard for ultrasonic test blocks? BS 2704. BS 2910. BS 5996, ‘There is no British Standard for test blocks. eece 10. Which is the best NDT method? Magnetic particle testing. Radiographic testing Ultrasonic testing. It depends on many factors, NDT methods are usually complimentary. eece 11. The ability to resolve on the CRT two discontinuities at slightly different depths in a test piece would be improved by: a, decreasing the frequency. b. shortening the pulse duration. ¢. increasing the amplitude of the initial pulse. d. Alf the above.Argyll-Ruane Ltd opesaur 12. Which of the following formulae is incorrect? a. all skip distance = wall thickness x tan of the probe angle Opp u Opp , Hyp Di xf ©. Near gone length = = 08 xe d. 10% half angle = LOS ¢ 10% half angle = HS 13. Ultrasonic waves in a test material are: electromagnetic waves. low voltage electrical fields. radio waves mechanical vibrations. eege 14. Through transmission testing requires: a. access to both sides of the test specimen. b. more than one crystal/Aransducer. c. a parallel sided test specimen. d. Allof the above. 15. When an incident ultrasonic wave impinges upon an interface of two materials with different acoustic impedance values at an angle other than normal to the surface, the wave may be: a. reflected b. refracted, ¢. mode converted. d. Allof the above. 16. Lamb waves may be used to inspect forgings. b. steel castings. c. thin sheet. d. non-ferrous materials only. 17. Calculate the length of the near zone for a 12 mm diameter, 2.5 MHz transducer in a medium with a velocity of 6000 mis. a 15.0mm. b 1.25 mm. ©, 12.5 mm. ds 1.5mm.Argyll-Ruane Lid oPesau 18, Inan A-scan presentation: ‘a. _ the signal height represents defect size and the horizontal axis represents distanc b. the vertical axis represents amplitude and the horizontal axis represents distan the signal height represents the sound energy returning to the crystal and the horizontal axis represents time. d. Allof the above e. band c only. 19. Calculate the wavelength for a frequency of 4.25 MHz at a velocity of 5.8 kilometres per second: a 0.73 mm. b. 1.36 mm. cc. 0,073 mm, d. 0.136 mm, 20. Which of the following formulae is eee a Sino= YF x Sin B V2 x sin b. Sin B= YF x Sin a Sine Vi= c snp <2 21. Of any following scan types, which produces a plan view of any defective area under test? a. A-scan. b. ©, 4. 22. Which of the following statements is true in relation to carrying out an ultrasonic angle beam test on a steel weldment’? a, Itis possible to know the exact size of a defect in a weld by measuring the echo height, b. _Itis possible to know the exact size of a defect in a weld by assessing the echo shape. ¢. Asmall echo on the CRT may be a large significant defect d, None of the above are true. 23. ALan interface between two different materials, an impedance difference results in: a. reflection of the entire incident energy at the interface b. absorption of sound. c. division of sound energy into transmitted and reflected modes. d. None of the aboveArgyll-Ruane Lid opasam 24. 26. 21. 28. 29. Which of the following discontinuities would provide the highest signal on CRT using the same crystal and gain? Lack of penetration. Porosity A longitudinal crack. Depends on the orientation of the defect in relation to the axis of the ultrasonic beam, ecce A smooth flat discontinuity whose major plane is perpendicular to the direction of sound propagation may be indicated by: a. an echo amplitude comparable in magnitude to the back surface reflection, b. a complete loss of back surface reflection. €. anecho amplitude larger in magnitude than the back surface reflection 4. Allof the above. Sizing of plate defects may be carried out in accordance with which British Standard? a BS 2704, BS 2910. BS 5996. BS 3683, ‘Compensation for the variation in echo height related to variations in discontinuity depth in the test material is known as a. Attenuation Refraction. Distance amplitude correction. Suppression. ees When the incident angle is chosen between the first and second critical angles, the ultrasonic waves generated in the test specimen will be: a, longitudinal b. shear, © d surface. lamb. Sound attenuation in a material is due to: a. absorption and scattering b. Reflection and refraction. Density and velocity dd. Density and elasticity. A frequency of 500,000 cycles per second is equal to: a. 500 KHz. b. 500 Hz. ce. SMHz. d. SO KHz,