Fechar
1. The indication on the instrument display that represnts the far boundry of the material being tested is called:
a. hash
b. the initial pause
c. the main bang
d. the back surface reflection
2. The cable that connects the ultrasonic instrument to the tranducer is specially desighned so that one conductor is centered inside another. The technical name for such a cable is:
a. BX cable
b. conduit
c. coaxial cable
d. ultrasonic conductor cable-grade 20
3. The process of comparing an instrument or device with a standard is called:
a. angulation
b. calibration
c. attenuation
d. correlation
4. Another name for Rayleigh waves is:
a. shear waves
b. longitudinal waves
c. transverse waves
d. surface waves
5. A material used between the faces of a transducer and the test surface to permit or improve the transmission of ultrasonic vibration from the transducer to the material being tested is called:
a. a wetting agent
b. a couplant
c. an acoustic transmitter
d. a lubricant
6. The piezoelectric material in a transducer that vibrates to produce ultrasonic waves is called a:
a. backing material
b. Lucite wedge
c. crystal
d. couplant
7. In contact testing, the entry surface indication is sometimes referred to as:
a. the initial pulse
b. the back reflection
c. the skip distance
d. the scan path
8. An ultrasonic instrument display pattern containing a large number of low-level indications (often rrferred to as "hash") could be caused by:
a. a crack
b. a large inclusion
c. coarse-grained material
d. a gas pocket
9. A test method employing two separate tranducers on opposite surfaces of the material being tested is called:
a. contact testing
b. surface wave testing
c. through-transmission testing
d. Lamb wave testing
10. Moving a transducer over a test surface either manually or automatically is referred to as:
a. scanning
b. attenuating
c. angulating
d. resonating
11. In immersion testing, the most commonly used couplant is:
a. water
b. oil
c. glycerine
d. alcohol
12. The piezoelectric material in the transducer:
a. converts electrical energy into sound
b. converts electrical energy into mechanical energy
c. eliminates the signal-to-noise energy
d. produces high speed electrons in metals
13. The reference holes in standard aluminim area amplitude ultrasonic test blocks contain:
a. flat bottom holes
b. concave-surface holes
c. convex-surface holes
d. conical-shape holes
14. Ultrasonic waves transmitted into and received from the test material in the form of repetitive burst of acoustic energy is called:
a. pulse echo testing
b. continuous wave testing
c. resonance testing
d. none of the above
15. Metal blocks, which contain one or more drilled holes to simulate discontinuities, are called:
a. scrubbers
b. crystal collimators
c. single plane angulators
d. reference blocks
16. The depth of a discontinuity cannot be determined when using the:
a. straight beam testing method
b. through-transmission testing method
c. angle beam testing method
d. immersion testing method
17. When performing a surface wave test, indications may result from:
a. improper frequency
b. oil on the surface
c. a surface discontinuity
d. the acoustical velocity of aluminum
18. Transducers constructed with a plastic wedge or standoff between the transducer element and the test piece are commonly used for:
a. for angle beam contact testing
b. for immersion testing
c. to eliminate the need for couplant
d. to reduce the speed of electrons
19. Which of the following materials of the same alloy is most likely to produce the greatest amount of sound attenuation over a given distance?
a. A hand forging.
b. A coarse-grained casting.
c. An extrusion.
d. The attenuation is equal in all material.
20. When the motion of tje particles of a medium is parallel to the direction of propagation, the wave being transmitted is called a:
a. longitudinal wave
b. shear wave
c. surface wave
d. Lamb wave
21. When the motion of the particles of a medium is transverse to the direction of propagation, the wave being transmitted is called a:
a. longitudinal wave
b. shear wave
c. surface wave
d. Lamb wave
22. When a vertical indication has reached the maximum signal height which can be displayed or viewed on the display of an ultrasonic instrument, the indication is said to have reached its:
a. distance amplitude height
b. absorption level
c. vertical level
d. limit of resolution
23. A test method in which the parts to be inspected are placed in a water bath or some other liquid couplant.is called:
a. contact testing
b. immersion testing
c. surface wave testing
d. through-transmission testing
24. When the incident angle is chosen to be between the first and second angle critical angles, the ultrasonic wave mode within the partwill be a:
a. longitudinal wave
b. shear wave
c. surface wave
d. Lamb wave
25. The formula used to calculate the angle of refraction within a material is called:
a. Fresnel's law
b. Fraunhofer's law
c. Snell's law
d. Lamb's law
26. A circuit that generates a burts of alterning voltage that is applied to the sending of the transducer is called a:
a. pulsar
b. receiver- amplifier
c. damping
d. clock
27. A type of data prestion most likely to be used with a high speed automatic scanning system is:
a. an A-scan presentation
b. a velocity versus amplitude plot
c. a C-scan presentation
d. a plot of echo height versus depth
28. What can cause nonrelevant indication on the cathode ray tube?
a. contoured surfaces
b. edge effects
c. surface conditions
d. all of the above
29. The proper interpretaion and evaluation of the presented defect signals are essential to any nondestructive test. A common method for the estimation of defect size is the use of:
a. a double transducer test
b. a piezoeletric standard
c. mode conversion
d. a reference standard
30. Another name for Fresnel zone is:
a. Fraunhofer zone
b. near field
c. far field
d. Torrid zone
31. The velocity of sound in a material is dependent upon the:
a. frequency of the wave
b. wavelength
c. material properties
d. vibration cycle
32. In immersion testing , a wetting agent is added to the water to:
a. adjust the viscosity
b. help eliminate the formation of bubbles
c. prevent cloudiness
d. none of the above.
