L1:P5 Flashcards
1)
Ultrasonic waves that travel along the surface of a material and whose particle motion is elliptical are called?
A. Shear Waves
B. Transverse Waves
C. Longitudinal Waves
D. Rayleigh Waves
D. Rayleigh Waves
2)
When the incident angle is between the first and second critical angles, the ultrasonic wave mode within the test piece will be a:
a. Longitudinal Wave
b. Shear Wave
c. Surface Wave
d. Lamb Wave
b. Shear Wave
3)
The formula used to calculate the angle of refraction within a material is called:
a. Fresnels law
b. Faunhofers law
c. Snells law
d. Lambs law
c. Snells law
4)
In a material with a given velocity, when frequency is increased, the wavelength will:
a. not be affected
b. increase
c. decrease
d. double
c. decrease
5)
What is the most common type of data display used for the manual ultrasonic examination of welds:
a. A-scan display
b. B-scan display
c. C-scan display
d. D-scan display
a. A-scan display
6)
Which is the plot of signal amplitude versus time:
a. A-scan display
b. B-scan display
c. C-scan display
d. None of the above
a. A-scan display
7)
Calculate the wavelength when using a 5 MHz probe on a material with a velocity of 3000 m/s:
a. 1.2mm
b. 0.6mm
c. 1.7mm
d. 0.4mm
b. 0.6mm
8)
What is the material called that is placed between the probe and the test piece to help transit from one to the other?
a. a couplant
b. an interface
c. an absorber
d. a refractor
a. a couplant
**9)
A plan view display is called:
a. a C-Scan display
b. an A-scan display
c. an X-axis plot
d. a strip chart recording
a. a C-Scan display
10)
Ultrasonic data which is displayed in a form representative of the cross section of the test specimen is called:
a. an A-scan presentation
b. a B-scan presentation
c. a C-scan presentation
d. an X-Y plot
b. a B-scan presentation
11)
Data presentation most likely to be used with automatic immersion scanning systems is:
a. an A-scan presentation
b. a B-scan presentation
c. a C-scan presentation
d. A D-scan presentation
c. a C-scan presentation
12)
In an immersion system, what spans the width of the immersion tank?
a. an articulator
b. a bridge
c. a manipulator
d. a search tube
b. a bridge
13)
On an ultrasonic immersion system what is used to adjust transducer angle:
a. a carriage
b. a manipulator
c. a search tube
d. an index system
b. a manipulator
14)
Rough entry surfaces can result in:
a. a loss of echo amplitude from discontinuities
b. an increase in the width of the front surface echo
c. both a. and b.
d. none of the above
c. both a. and b.
15)
As the grain size increases, the main effect in ultrasonic testing is on the:
a. velocity of sound
b. attenuation
c. acoustic impedance
d. angle of refraction
b. attenuation
16)
Only longitudinal waves can occur in:
a. machine oil
b. aluminium
c. ice
d. beryllium
a. machine oil
17)
If the velocity of a wave is 6.25mm/s at 13mm below the surface, what is the velocity at 51mm below the surface:
a. 1/4 the velocity at 13 mm
b. 1/2 the velocity at 13 mm
c. the same as the velocity at 13 mm
d. none of the above
c. the same as the velocity at 13 mm
18)
What can cause non relevant indications on screen?
a. drilled holes
b. edge effects
c. surface conditions
d. all of the above
d. all of the above
19)
A common method for the estimation of defect size is the use of a:
a. double transducer test
b. piezoelectric standard
c. mode conversion
d. reference reflector
d. reference reflector
20)
Another name for Fresnel Zone is:
a. transition zone
b. near field
c. far afield
d. dead zone
b. near field
21)
Attenuation is a:
a. display characteristic
b. Material parameter
c. transducer characteristic
d. all of the above
b. Material parameter
22)
What must be done to find discontinuities that are oriented at an angle to the entry surface:
a. change the frequency
b. grind the surface
c. use angle probes
d. increase the gain
c. use angle probes
23)
an A-scan display which shows a signal both above and below the sweep line is called:
a. a 1/2 wave reflected display
b. un-rectified display
c. full wave rectified display
d. a fequency modulated display
b. un-rectified display
24)
Surface (Rayleigh) waves travelling on the top surface of a block:
a. are not reflected from a sharp edge corner
b. are reflected from a sharp edge corner
c. travel through the sharp edge corner and are reflected from the lower edge
d. are absorbed by a sharp edge corner
b. are reflected from a sharp edge corner
25)
The piezoelectric material in the probe:
a. converts electrical energy to mechanical enegery
b. converts mechanical energy to electrical energy
c. both a + b
d. neither a nor b
c. both a + b
26)
The velocity of sound in a material is dependant upon the:
a. frequency
b. wavelength
c. type of material
d. pulse length
c. type of material
27)
To change the wavelength of sound in a test part you would change the:
a. sound wave frequency
b. diameter of the transducer
c. electrical pulse voltage
d. pulse repetition rate
a. sound wave frequency
28)
Ultrasonic waves are commonly used to:
a. test materials for discontinuities
b. test materials for thickness
c. test materials for grain size
d. all of the above
d. all of the above
29)
Which of the following has the longest near zone:
a. 13 mm diameter 1 MHz
b. 13 mm diameter 2.25MHz
c. 28.5 mm diameter 1MHz
d. 38 mm diameter 2 MHz
d. 38 mm diameter 2 MHz
30)
Which of the following is/are advantages of immersion testing:
a. inspection speed increased
b. ability to control and direct sound beams
c. adaptability for automated scanning
d. all of the above
d. all of the above
31)
As frequency increases, the wavelength will:
a. decrease (be shorter)
b. increase (be longer)
c. remain the same but velocity will increase
d. remain the same but velocity will decrease
a. decrease (be shorter)
32)
the product of the material density and the velocity of sound within that material is known as its:
a. acoustic impedance
b. near field
c. acoustic attenuation
d. ultrasonic beam distribution
e. vibrational index
a. acoustic impedance
33)
For a given incident angle, if the frequency of the transducer increases, the refracted angle will:
a. increase
b. decrease
c. stay the same
d. cannot be determinned
c. stay the same
34)
Both longitudinal and shear waves may occur in a second medium when the angle of incidence is:
a. below the first critical angle
b. between the first and second critical angles
c. padt the second critical angle
d. only at the second critical angle
a. below the first critical angle
35)
Which of the following frequencies would provide the greater depth of penetration:
a. 1 MHz
b. 2.25 MHz
c. 5 MHz
d. 10 MHz
a. 1 MHz
36)
Which of the following materials is considered the most efficient receiver of ultrasonic energy:
a. quarts
b. ceramic
c. barium titanate
d. lithium sulphate
d. lithium sulphate
37)
The loss of energy through a material is the result of beam:
a. interference
b. attenuation
c. absorption
d. reflection
b. attenuation
38)
Which of the following characteristics would not affect the selection of a couplant:
a. mode of propagation desired
b. material surface finish and temperature
c. operating frequency of the transducer
d. chemical properties of the couplant
c. operating frequency of the transducer
39)
The change in direction of an ultrasonic beam when it passes from one material to another is called;
a. refraction
b. diffraction
c. angulation
d. reflection
a. refraction
40)
A device that transforms electrical pulses into mechanical and vice versa is:
a. attenuator
b. a piezoelectrical material
c. a mode of converter
d. none of the above
b. a piezoelectrical material
