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block

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:

Select the correct answer(s).  

(0/0)

---

a lubricant.

wetting agent.

couplant.

an acoustic transmitter.

none

Ultrasonic testing of material where the probe is in direct contact with the material being tested may be:

Select the correct answer(s).  

(0/0)

---

immersion testing.

water jet.

air coupled.

straight beam testing.

none

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:

Select the correct answer(s).  

(0/0)

---

refraction

attenuation

rarefaction.

compression

none

The indication on the instrument display that represents the far boundary of the material being tested is called:

Select the correct answer(s).  

(0/0)

---

grass or hash.

the back-surface reflection.

the main bang.

the initial pause.

none

The process of standardizing an instrument or device by using a reference standard is called:

Select the correct answer(s).  

(0/0)

---

calibration.

attenuation.

correlation.

angulation.

none

The piezoelectric material in a transducer that vibrates to produce ultrasonic waves is called a:

Select the correct answer(s).  

(0/0)

---

backing material.

crystal.

couplant.

plastic wedge.

none

Another name for a compressional wave is:

Select the correct answer(s).  

(0/0)

---

shear wave.

transverse wave.

lamb wave

longitudinal wave

none

The amount of beam divergence from a crystal is primarily dependent on the:

Select the correct answer(s).  

(0/0)

---

type of test

tightness of crystal backing in the transducer.

pulse length.

frequency and crystal size.

none

An advantage of using lithium sulfate in transducers is that it:

Select the correct answer(s).  

(0/0)

---

is one of the most efficient receivers of ultrasonic energy.

is insoluble.

can withstand temperatures as high as 700 °C (1260 °F).

is one of the most efficient generators of ultrasonic energy

none

The transducer shown in Figure 1 is used for:

Select the correct answer(s).  

(0/0)

---

surface wave testing.

immersion testing.

straight beam testing.

angle beam testing.

none

The transducer that contains the thinnest piezoelectric crystal is a:

Select the correct answer(s).  

(0/0)

---

25 MHz transducer.

1 MHz transducer.

5 MHz transducer.

15 MHz transducer.

none

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:

Select the correct answer(s).  

(0/0)

---

reflection testing.

dispersion.

refraction.

angulation.

none

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:

Select the correct answer(s).  

(0/0)

---

10 MHz

5 MHz

1 MHz

2.25 MHz

none

The technical name for the cable that connects the ultrasonic instrument to the transducer is:

Select the correct answer(s).  

(0/0)

---

BX cable.

coaxial cable.

ultrasonic conductor cable-grade 20.

conduit.

none

Another name for rayleigh waves is:

Select the correct answer(s).  

(0/0)

---

longitudinal waves.

shear waves.

surface waves.

transverse waves.