L1:P5

Question 1

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

Answer 1

D. Rayleigh Waves

Question 2

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

Answer 2

b. Shear Wave

Question 3

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

Answer 3

c. Snells law

Question 4

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

Answer 4

c. decrease

Question 5

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

Answer 5

a. A-scan display

Question 6

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

Answer 6

a. A-scan display

Question 7

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

Answer 7

b. 0.6mm

Question 8

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

Answer 8

a. a couplant

Question 9

**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

Answer 9

a. a C-Scan display

Question 10

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

Answer 10

b. a B-scan presentation

Question 11

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

Answer 11

c. a C-scan presentation

Question 12

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

Answer 12

b. a bridge

Question 13

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

Answer 13

b. a manipulator

Question 14

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

Answer 14

c. both a. and b.

Question 15

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

Answer 15

b. attenuation

Question 16

16)

Only longitudinal waves can occur in:

a. machine oil
b. aluminium
c. ice
d. beryllium

Answer 16

a. machine oil

Question 17

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

Answer 17

c. the same as the velocity at 13 mm

Question 18

18)

What can cause non relevant indications on screen?

a. drilled holes
b. edge effects
c. surface conditions
d. all of the above

Answer 18

d. all of the above

Question 19

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

Answer 19

d. reference reflector

Question 20

20)

Another name for Fresnel Zone is:

a. transition zone
b. near field
c. far afield
d. dead zone

Answer 20

b. near field

Question 21

21)

Attenuation is a:

a. display characteristic
b. Material parameter
c. transducer characteristic
d. all of the above

Answer 21

b. Material parameter

Question 22

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

Answer 22

c. use angle probes

Question 23

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

Answer 23

b. un-rectified display

Question 24

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

Answer 24

b. are reflected from a sharp edge corner

Question 25

# **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

Answer 25

c. both a + b

Question 26

# **26)** **The velocity of sound in a material is dependant upon the:** a. frequency b. wavelength c. type of material d. pulse length

Answer 26

c. type of material

Question 27

# **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

Answer 27

a. sound wave frequency

Question 28

# **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

Answer 28

d. all of the above

Question 29

# **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

Answer 29

d. 38 mm diameter 2 MHz

Question 30

# **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

Answer 30

d. all of the above

Question 31

# **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

Answer 31

a. decrease (be shorter)

Question 32

# **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

Answer 32

a. acoustic impedance

Question 33

# **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

Answer 33

c. stay the same

Question 34

# **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

Answer 34

a. below the first critical angle

Question 35

# **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

Answer 35

a. 1 MHz

Question 36

# **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

Answer 36

d. lithium sulphate

Question 37

# **37)** **The loss of energy through a material is the result of beam:** a. interference b. attenuation c. absorption d. reflection

Answer 37

b. attenuation

Question 38

# **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

Answer 38

c. operating frequency of the transducer

Question 39

# **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

Answer 39

a. refraction

Question 40

# **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

Answer 40

b. a piezoelectrical material