Conventional UT Question & Answers_General

1. ULTRASONIC TESTING
LEVEL-II
Page 1 of 9
GENERAL
1. To determine wavelength ...
a. Multiply velocity by frequency
b. Divide velocity by frequency
c. Divide frequency by velocity
d. None of the above
2. Velocity measurements in material revealed that the velocity decreased
as frequency increased. The material is called.......
a. Dissipated
b. Discontinuous
c. Dispersive
d. Degenerative
3. Thickness resonanceoccurs when transducer and test parts are excited
at a frequency equal to...
a. 2T/V
b. T/2T
c. V/2T
d. 2V/T
4. A change of 16dBon the attenuator corresponds to an amplitude ratio
of.....
a. 6.3 : 1
b. 5.2 : 1
c. 7.4 : 1
d. 9.5 : 1
5. The term “Sweep distance” is used to....
a. How fastthe sound is pass through the material
b. The equivalent sound beam path displayed on the CRT in terms of
unit distances in the material
c. The velocity with which the search unit is moved across the material
d. How electrical energy passes from the transducer to material being
tested

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6. Advantageof computer controlled ultrasonic testing include:
a. Lower investment costs
b. Highly dependence upon operator
c. Real time analysis of test results
d. No need for instrumentcalibration.
7. The piezo-electric material in search unit which vibrates to produce
ultrasonic waves is called as
a. Backing material
b. Lucite
c. Crystal
d. Couplant
8. The process of comparing an instruments or device with a standard is
called
a. Angulations
b. Calibration
c. Attenuation
d. Correlation
9. Another name for compression waveis
a. Lamb wave
b. Shear wave
c. Pressurewave
d. Transversewave
10.In immersion testing most commonly used.
a. Water
b. Oil
c. Glycerine
d. Alcohol
11.Shortestwavelength produces by probehaving frequency...
a. 1 MHz
b. 5 MHz
c. 10 MHz
d. 2.5 MHz

3. ULTRASONIC TESTING
LEVEL-II
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12.The velocity is primarily dependant on
a. A pulse length
b. The frequency
c. The material through which the sound is being transmitted
d. None of the above
13.When using surfacewavepatches of oil and dirt on surfacemay.....
a. Block the progress of all sound
b. Attenuate the sound
c. Have no effect on the test
d. Cause both an attenuation and indication on screen
14.Wheel type transducer is one of the examples of...
a. Through transmission testing
b. Contact testing
c. Resonance testing
d. Immersion testing
15.Which circuit generates burstof alternating voltage that is applied to the
sending transducer.
a. Pulser
b. Receiver – amplifier
c. Damping
d. Clock
16.The length of zoneadjacent to the transducer in which fluctuations in
sound pressureoccur is mostly affected by...
a. The frequency of transducer
b. The diameter of transducer
c. The length of cable
d. Both a & b
17.A shortburstof alternating electrical energy is called
a. A continuous wave
b. A peaked DC voltage
c. An ultrasonic wave
d. A pulse

4. ULTRASONIC TESTING
LEVEL-II
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18.The amount of energy reflected from a discontinuity will be depends on
a. The size of the discontinuity
b. Orientation of discontinuity
c. Type of discontinuity
d. All of the above
19. In transmitting energy into the part shownin figure abovethe
ultrasonic beam will...
a. Diverges through part
b. Converges through part
c. Transmitted straightthrough the part
d. Not enter the part
20. What is the most common type of data display used for ultrasonic
examination of welds...?
a. A-scan display
b. B-scan display
c. C-scan display
d. An X-Y plot
21. Attenuation is a :
a. Test display characteristic
b. Test material parameter
c. Transducer characteristic
d. Formof testing

5. ULTRASONIC TESTING
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22.If 5 MHz transducer is substituted for a 2.25 MHz transducer , what
would be the effect on the wavelength of a longitudinal mode wave
produced in the test specimen
a. The wavelength would be longer
b. The wavelength would remain constant
c. The wavelength would be shorter
d. The wavelength would vary directly with the acoustic impedance
23. (See above figure) When longitudinal sound wavestrikes a water-steel
interface at an angle of incidence of 15°,
a. All the sound energy is reflected back into the water at an angle of 15°
b. Part of sound energy is reflected at 15°and part is refracted into the
steel at an angle of less than 15°
c. Part of sound energy is reflected at 15° and partis refracted along the
water-steel interface
d. Part of the sound energy is reflected at 15°and part is refracted into
the steel at an angle greater than 15°
24.When material grain sizeis on the order of ___________ wavelength of
larger, excessive scattering of ultrasonic beam may affect test result...
a. 1
b. ½
c. 1/10
d. 1/100

6. ULTRASONIC TESTING
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25.The difference between compression and shear waveis
a. Quantitative measure
b. Particle direction
c. Qualitative measure
d. Amplitude
26.In A-scan equipment the RF Pulser output is normally the range of...
a. 1-10 V
b. 10-100 V
c. 100-1000V
d. 1000-3000 V
27.In water (VL= 1.5 X105
cm/s) immersion test, ultrasonic energy is
transmitted into steel
(VT=3.2 X 105
cm/s) at an incident angle of 14°. What will be the
refracted shear wavewithin material?
a. 13°
b. 35°
c. 31°
d. 51°
28.What is the transducer half-anglebeam spread of a 1.25 cm diameter ,
2.25 MHz transducer in water (VL= 1.5 X105
cm/s)...
a. 2.5°
b. 3.75°
c. 37.5°
d. 40.5°
29.Which of the following modes are quickly damped out during immersion
testing?
a. Longitudinal waves
b. Shear waves
c. Transversewave
d. Surfacewaves

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30.Attenuation is the loss of the ultrasonic energy during the courseof
propagation in the material due to.....
a. Reflection and refraction
b. Dispersion and diffraction
c. Absorption and scattering
d. Composition and shape
e. All of the above
31.Surfacewaves arereduced to an energy level of approximately 1/25 of
the original power at a depth of....
a. 25mm
b. 102mm
c. 1 wavelength
d. 4wavelength
32. The back and forth movements of particles within a medium are called
…
a. Cycles
b. Wave length
c. Vibrations
d. Displacements
33.The ratio between the wave speed in one material and the wavespeed
in second material is called...
a. Acoustic impedance of interface
b. Young’s modulus
c. Poisson’s ratio
d. Indexof refraction
34.A quartz cuts so that its major faces are parallel to the Z &Y axes and
perpendicular to the X-axis is called....
a. Y-cut crystal
b. X-cut crystal
c. Z-cut crystal
d. ZY-cut crystal

8. ULTRASONIC TESTING
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35.Most efficient sound receiver is...
a. Lithium sulphate
b. Quartz
c. Barium titanate
d. Silver oxide
36.Most efficient sound transmitter is...
a. Lead zirconate titanate
b. Barium titanate
c. Silver oxide
d. Lithium sulphate
37.Which of the following scan gives cross section view?
a. A-scan
b. B-scan
c. C-scan
d. D-scan
38.The Couplant is needed to test hot steel plate of 250°F is...
a. Water
b. Mercury
c. Tractor oil
d. Grease
e. None of the above
39. Where does beam divergenceoccurs...
a. Near field
b. Far field
c. At the crystalface
d. None of the above
40.The velocity of the sound in material depends upon ...
a. Frequency
b. Wavelength
c. Material properties
d. Vibration cycle

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1. b 11. c 21. b 31. c
2. c 12. c 22. c 32. c
3. c 13. d 23. d 33. d
4. a 14. d 24. c 34. b
5. b 15. a 25. b 35. a
6. c 16. c 26. c 36. a
7. c 17. d 27. c 37. b
8. b 18. d 28. b 38. e
9. c 19. a 29. d 39. b
10. a 20. a 30. c 40. c