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Latest ASNT NDT Ultrasonic Method (UT) Level III Examination Questions and Answers

1.

The resonant frequency of a 2 cm (0.79 in.) thick plate of naval brass (V = 4.43 × 105 cm/s) is:

 
 
 
 

2.

The length of the near field for a 2.5 cm (1 in.) diameter, 5 MHz transducer placed in oil (V = 1.4 × 105cm/s) is approximate:

 
 
 
 

3.

In a water (VL = 1.5 × 105 cm/s) immersion test, ultrasonic energy is transmitted into steel (VT = 3.2 ×105 cm/s) at an incident angle of 14°. What is the refracted shear wave within the material?

 
 
 
 

4.

The acoustic impedance for brass (V = 4.43 × 105 cm/s, p = 8.42 gm/cm³) is:

 
 
 
 

5.

What would be the wavelength of the energy in lead (V = 2.1 × 105 cm/s) if it is tested with a 25 MHz transducer?

 
 
 
 

6.

What is the transducer half-angle beam spread of a 1.25 cm diameter, 2.25 MHz transducer in water (V = 1.5 × 105 cm/s)?

 
 
 
 

7.

In an ultrasonic test system where signal amplitudes are displayed, an advantage of a frequency-independent attenuator over a continuously variable gain control is that the:

 
 
 
 

8.

An amplifier in which received echo pulses must exceed a certain threshold voltage before they can be indicated might be used to:

 
 
 
 

9.

The output voltage from a saturated amplifier is:

 
 
 
 

10.

The transmitted pulse at the output of the pulse usually has a voltage of 100 to 1000 V, whereas the voltages of the echoes at the input of the amplifier are on the order of:

 
 
 
 

11.

The intended purpose of the adjustable calibrated attenuator of an ultrasonic instrument is to:

 
 
 
 

12.

Which of the following might result in increased transmission of ultrasound within a coarse-grained material?

 
 
 
 

13.

The term that is used to determine the relative transmittance and reflectance of ultrasonic energy at an interface is called:

 
 
 
 

14.

In a forging, discontinuities associated with nonmetallic inclusions can most accurately be described as being:

 
 
 
 

15.

The preferred method of ultrasonically inspecting a complex-shaped forging:

 
 
 
 

16.

When maximum sensitivity is required from a transducer:

 
 
 
 

17.

The sensitivity of an ultrasonic test system:

 
 
 
 

18.

The ability of a test system to separate the back surface echo and the echo from a small discontinuity just above this back surface:

 
 
 
 

19.

Transducer sensitivity is most often determined by:

 
 
 
 

20.

Side-drilled holes are frequently used as reference reflectors for:

 
 
 
 

21.

Notches provide good reference discontinuities when a UT examination is conducted to primarily detect discontinuities such as:

 
 
 
 

22.

The difference between a compression and shear wave is:

 
 
 
 

23.

The particle motion for rayleigh waves is usually described as:

 
 
 
 

24.

Based upon wave theory and ignoring attenuation losses, the echo amplitude of a finite reflector is:

 
 
 
 

25.

The rate generator in B-scan equipment will invariably be directly connected to the:

 
 
 
 

26.

In A-scan equipment, the RF pulse output voltage is normally in the range of:

 
 
 
 

27.

When contact testing, an increase in tightness of a shrink-fit to a hollow shaft will cause the ratio of the back reflection to the metal-to-metal interface reflection to:

 
 
 
 

28.

The frequency that can best distinguish the difference between a large planar discontinuity and four stacked (multiple-layered) laminations in the rolled plate is:

 
 
 
 

29.

During immersion examination, when evaluating the response from a contoured surface of a part, irrelevant indications due to the contour are most likely to appear as:

 
 
 
 

30.

The pulse applied to the electrodes of the ultrasonic transducer is:

 
 
 
 

31.

In calibrating an ultrasonic test instrument using the responses from each of the area-amplitude type reference blocks, the determination of the:

 
 
 
 

32.

Test sensitivity corrections for metal distance and discontinuity area responses are accomplished by using:

 
 
 
 

33.

The time from the start of the ultrasonic pulse until the reverberations completely decay limits the maximum usable:

 
 
 
 

34.

Rough surfaces can cause undesirable effects, which are noticeable when parts are tested ultrasonically, including:

 
 
 
 

35.

Rough surfaces cause the echo amplitude from discontinuities within the part to:

 
 
 
 

36.

Resonance testing equipment generally uses:

 
 
 
 

37.

To eliminate the decrease of sensitivity close to a wall that is parallel to the beam direction, the transducer used should be:

 
 
 
 

38.

Which of the following transducer materials makes the best transmitter?

 
 
 
 

39.

Of the transducer materials listed below, the most efficient receiver is:

 
 
 
 

40.

The concentration of energy in the far-field of a transducer beam is:

 
 
 
 

41.

An extensive application of shear waves in ultrasonic testing is the inspection of:

 
 
 
 

42.

In angle beam shear wave testing, skip distance will __________ as the thickness of the test specimen is increased.

 
 
 
 

43.

The thickness range of UT resonance thickness gages can be increased by:

 
 
 
 

44.

The ability of transducers to detect echoes from small discontinuities is a definition for:

 
 
 
 

45.

From the equation for the length of the near field, it can be determined that the near field can be minimized by:

 
 
 
 

46.

The principal attributes that determine the differences in ultrasonic velocities among materials are:

 
 
 
 

47.

Wavelength may be defined as:

 
 
 
 

48.

Velocity measurements in a material revealed that the velocity decreased as frequency increased. This material is called:

 
 
 
 

49.

The sound beam emanating from a continuous wave sound source has two zones. These are called the:

 
 
 
 

50.

The difference between through-transmission and pitch-catch techniques is that:

 
 
 
 

Question 1 of 50

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