UTT Flashcards
1.The indication on the instrument display that represents the far boundary of the material being tested is called:
a.grass or hash.
b.the initial pause.
c.the main bang.
d.the back-surface reflection
d.the back-surface reflection
2.In immersion testing, the position of the transducer is often varied by a manipulator to transmit sound into the test part at various angles to the front surface. Such a procedure is referred to as:
a.angulation.
b.dispersion.
c.reflection testing.
d.refraction
a.angulation.
- The technical name for the cable that connects the ultrasonic instrument to the transducer is:
a.BX cable.
b.conduit.
c.coaxial cable.
d.ultrasonic conductor cable-grade 20.
c.coaxial cable.
- The process of standardizing an instrument or device by using a reference standard is called:
a.angulation.
b.calibration.
c.attenuation.
d.correlation
b.calibration.
5.Another name for a compressional wave is:
a.lamb wave.
b.shear wave.
c.longitudinal wave.
d.transverse wave
c.longitudinal wave.
6.Another name for rayleigh waves is:
a.shear waves.
b.longitudinal waves.
c.transverse waves.
d.surface waves.
d.surface waves.
- A material used between the face of a transducer and the test surface to permit or improve the transmission of ultrasonic vibrations from the transducer to the material being tested is called:
a.a wetting agent.
b.a couplant.
c.an acoustic transmitter.
d.a lubricant.
b.a couplant.
- The piezoelectric material in a transducer that vibrates to produce ultrasonic waves is called a:
a.backing material.
b.plastic wedge.
c.crystal.
d.couplant.
c.crystal.
- Ultrasonic testing of material where the probe is in direct contact with the material being tested may be:
a.water jet.
b.immersion testing.
c.air coupled.
d.straight beam testing.
d.straight beam testing.
- An advantage of using lithium sulfate in transducersis that it:
a.is one of the most efficient generators of ultrasonic energy.
b.is one of the most efficient receivers ofultrasonic energy.
c.is insoluble.
d.can withstand temperatures as high as 700 °C (1260 °F).
b.is one of the most efficient receivers ofultrasonic energy.
- The transducer shown in Figure 1 is used for:
a.surface wave testing.
b.angle beam testing.
c.immersion testing.
d.straight beam testing
d.straight beam testing
12.The transducer that contains the thinnest piezoelectric crystal is a:
a.1 MHz transducer.
b.5 MHz transducer.
c.15 MHz transducer.
d.25 MHz transducer.
d.25 MHz transducer.
13.Penetration of ultrasonic waves in a material is normally the function of test frequency used. The greatest depth of penetration is provided by a frequency of:
a.1 MHz
b.2.25 MHz
c.5 MHz
d.10 MHz
a.1 MHz
14.The amount of beam divergence from a crystal is primarily dependent on the:
a.type of test.
b.tightness of crystal backing in the transducer.
c.frequency and crystal size.
d.pulse length.
c.frequency and crystal size.
- When an ultrasonic beam passes through the interface between two dissimilar materials at an angle, a new angle of sound travel takes place in the second material due to:
a.attenuation.
b.rarefaction.
c.compression.
d.refraction.
d.refraction.
16.Figure 2 illustrates a contact test on a 203 mm (8 in.) aluminum block. A discontinuity is located 152 mm (6 in.) from the front surface. The display representation for this is shown to the right. What does indication A represent?
a.The initial pulse or front-surface indication.
b.The first discontinuity indication.
c.The first back-surface reflection.
d.Baseline.
a.The initial pulse or front-surface indication.
17.In Figure 2, indication B represents:
a.the initial pulse or front-surface indication.
b.the first discontinuity indication.
c.the first back-surface reflection.
d.baseline.
b.the first discontinuity indication.
18.In Figure 2, indication C represents the:
a.second back-surface reflection.
b.first discontinuity indication.
c.second indication of the discontinuity.
d.first back-surface reflection.
d.first back-surface reflection.
19.In Figure 2, indication D represents the:
a.first discontinuity indication.
b.second indication of the discontinuity.
c.first back-surface reflection.
d.second back-surface reflection.
b.second indication of the discontinuity.
20.In Figure 2, indication E represents the:
a.first discontinuity indication.
b.second indication of the discontinuity.
c.first back-surface reflection.
d.second back-surface reflection.
d.second back-surface reflection.
21.The velocity of longitudinal waves is approximately ——- the velocity of shear waves in the same material:
a.two times
b.four times
c.1/2
d.9/10
a.two times
22.Figure 3 illustrates an immersion test of a 76 mm(3 in.) block of aluminum with a discontinuity
located 51 mm (2 in.) below the surface. The display pattern is shown also. What does indication A represent? Assume no sweep delay is used.
a.The first front-surface indication.
b.The initial pulse.
c.The first discontinuity indication.
d.The first back-surface reflection.
b.The initial pulse.
23.In Figure 3, indication B represents the:
a.first front-surface indication.
b.initial pulse.
c.first back-surface reflection.
d.first discontinuity reflection.
a.first front-surface indication.
24.In Figure 3, indication C represents the:
a.first front-surface indication.
b.first discontinuity indication.
c.first back-surface reflection.
d.second front-surface indication.
b.first discontinuity indication.