Principles of Finance Management Gitman. Ch 2 Test Bank Quiz Homework Question
Descripción completa
okeFull description
gfdgFull description
kDescription complète
wwFull description
GAMBARAN KULIAH DI UTDeskripsi lengkap
Descripción: ww
Descripción completa
Descripción completa
Aws
ultrasonic testing examDescripción completa
50 Question UT quiz 1. A test method in which the part to be inspected is separated from the search unit by water or some other liquid couplant is called
contact testing
immersion testing
surface wave testing
through-transmission testing
2. The act of evaluating and adjusting the precision and accuracy of the measurement equipment is called:
Standardization
Calibration
Accuracy
Tuning
3. Defects are generally known as volumetric or planar and it is considered that:
volumetric are more serious because they are higher stress concentrators.
planar are more serious because the y are higher stress concentrators.
both are equally serious because they are equal stress concentrators.
both are equally serious but they are not stress concentrators.
4. The accuracy of an ultrasonic thickness test is influenced by?
probe sensitivity
condition of the reflecting surface
accuracy of technicians calibration
all factors above affect accuracy
5. Snell’s Law describes the relationship between the sound velocity and:
The refracted angle of the wave
The reflected angle of the wave
Both A and B
None of the above
6. Significant errors in ultrasonic thickness measurements can occur if;
Test frequency is varying at a constant rate.
The velocity of propagation deviates substantially from an assumed constant value for a given material.
Water is employed as a couplant between the transducer and the part being measured.
None of the above should cause errors.
7. DAC stands for:
Distance Application Code
Direct Amplitude Code
Distance Amplitude Correction
Divergence Application Couplant
8. When the motion of the particles of a medium are at right angles to the direction of wave motion, the wave being transmitted is called a:
longitudinal wave
shear wave
surface wave
lamb wave
9. Of the following probes available, which would be the most appropriate to use on a material with high attenuation and good surface finish
Single crystal 2 MHz, 12.5 mm diameter
Twin crystal 4 MHz, 10 mm diameter
Single crystal 5 MHz, 10 mm diameter
Twin crystal 5 MHz, 12.5 mm diameter
10. When a wave encounters an interface at an oblique angle, what takes place at the interface due to the different sound velocities
Attenuation
Refraction
Beam spread
Beam impedance
11. in ___________ ultrasonic waves are transmitted into the test material in the form of repetitive shock vibrations
pulse-echo testing
continuous wave testing
resonance testing
none of the above
12. The minimum detectable defect size for a 5MHz probe in Aluminium (V = 6.3Km/s) is:
1.26mm
0.63mm
1.26Km
0.63Km
13. The formula Sina1/Sinv1 = Sina2/Sinv2 is used to determine:
angular relationships
phase velocities
amount of reflected sound energy
acoustic impedance
14. Smith forging and which of the following are recognised metal forging processes:
rolling.
extrusion and open die.
upset and closed die.
extrusion and closed die.
15. What is used to support the active element and dampen the transducers characteristics?
Resin
Oil
Backing material with a similar the impedance of the transducer
Any of the above will work
16. A term used in ultrasonics to express the speed at which sound waves pass through various substances is:
frequency
velocity
wave length
none of the above
17. An ultrasonic test using a straight beam contact search unit (probe) is being conducted through the thickness of a flat part. This method is best for detecting:
Laminar type flaws with major dimension parallel to the rolled surface.
Transverse type flaws with major dimensions at right angles to the rolled surface.
Radial flaws with major dimensions along length but radially oriented to the rolled surface.
None of the above.
18. Which of the following would make a good couplant?
Water
Oil
Glycerin
All of the above
19. The area in front of a transducer where there are extensive fluctuations in the sound field is called the:
Far field zone
Surface field zone
Near field zone
Phase shift zone
20. Of the following scan types, which one can be used to produce a recording of discontinuity areas superimposed over a plan view of the part.
A-scan
B-scan
C-scan
D-scan
21. Immersion transducers have:
An acoustical impedance matching layer
A large angle of refraction
A small angle of refraction
A large angle of reflection
22. An alloyed metal contains:
two or more metals combined during the molten stage to form a new metal.
alternate layers of different materials
an intermetallic compound
none of the above
23. The gradual loss of sonic energy as the ultrasonic vibrations travel through the material is referred to as.:
reflection
refraction
reproducibility
attenuation
24. The atomic number of an atom is equal to:
the number of neutrons and protons
the number of electrons
the number of neutrons and protons and electrons
the number of protons
25. In a calibrated A-scan presentation, the horizontal base line represents:
Amount of reflected ultrasonic sound energy.
Distance traveled by the search unit (probe).
Thickness of material being tested.
Elapsed time or distance between reflecting boundaries.
26. In a basic ultrasonic test pattern (A-scan) for contact testing, the initial pulse (assume no sweep delay is used):
Is the high indication of the extreme left side of th e screen that represents the entry surface of the inspected part.
Is the first pulse that occurs near the right side of the screen and represents the opposite boundary of the inspected part.
Is an indication that appears and disappears during scanning.
Is away the second pulse from the left on the viewing screen.
27. The total resistance that the cable presents to the electrical current passing through it is called:
Attenuation
Impedance
Shielding
Resistance
28. Couplant displaces the__________ and makes it possible to get more sound energy into the test specimen.
Surface rust
Surface blemishes
Sound energy
Air
29. Surface or Rayleigh waves travelling along the surface of relative thick solid material, penetrate to a depth of approximately:
One wavelength
Two wavelengths
Three wavelengths
Infinite wavelengths
30. When testing a weld for lack of side wall fusion, which probe is most commonly used:
Surface wave probe.
Twin crystal probe.
Single crystal probe.
An angle probe.
31. In some inspection procedures the suppression (reject) control is required to be turned off, this is because suppression may:
Introduce undesirable variations in the horizontal linearity
Introduce undesirable variations in the vertical linearity
Move the display of the transmitted pulse off the screen
not allow gating to be used.
32. Which type of test block is used to check horizontal linearity and the dB accuracy per requirements of AWS and AASHTO?
Distance/Sensitivity block
A DSC block
A rompus block
A shear wave calibration block
33. Increasing the frequency of an ultrasonic longitudinal wave will result in ___________in the velocity of that wave.
an increase
a decrease
no change
a reversal
34. The amount of beam divergence from a transducer (crystal) is primarily dependent on:
Type of test.
Tightness of crystal backing in the search unit.
Frequency and crystal size.
Pulse length.
35. A 6dB change in the measured ultrasonic signal strength indicates that the sound intensity changed by a factor of :
Six
Two
Twelve
Sixty
36. The ultrasonic test method in which finger damping in most effective in locating a discontinuity is:
shear wave
longitudinal wave
surface wave
compressional wave
37. When conducting a contact ultrasonic test, the hash, grass or irregular signals that appear in the CRT display of the area because:
fine grains in the structure
dirt in the water couplant
coarse grains in the structure
a thick but tapered back surface
38. During contact testing signal amplitude variations from a reflector can occur due to:
Loss of couplant.
gain setting.
probe angle.
all of the above.
39. The moving of a probe along a test surface either manually or automatically is referred to as:
scanning
attenuating
angulating
resonating
40. Acoustic impedance is identified by the letter:
Z
I
V
P
41. The boundary between two different materials which are in contact with each other is called:
a rarefactor
a refractor
an interface
a marker
42. A calibration block produced by the International Institute of Welding is called:
An IIW block
A DSC block
A rompus block
A shear wave calibration block
43. The equation describing wavelength in terms of velocity and frequency is:
wavelength= velocity x frequency
wavelength = (frequency x velocity)
wavelength = velocity / frequency
wavelength = frequency + velocity
44. Resonance or standing waves are a result of:
mode conversion
interference from reflected waves
beam divergence (spread)
attenuation of the sound waves
45. Ultrasound is generally defined as sound at frequency above the threshold of human hearing, which is?
20,000 MHz
20,000 Hz
2 MHz
2 Hz
46. Defects open to the surface are more dangerous than the same defect buried within the body of the component because:
they maybe closed over.
they are lower stress concentrators and are more likely to propagate cracks.
they are higher stress concentrators and are more likely to propagate cracks.
they are both equally dangerous.
47. In the far zone of an ultrasonic beam, as the distance from the probe increases, there is:
an irregular gain in beam intensity.
a regular gain in beam intensity.
a regular loss in beam intensity.
an irregular loss of beam intensity.
48. Which material properties affect the speed of sound within a material?
