Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. All other factors being equal, which of the following modes of vibration has the greatestvelocity?
a. Shear wave
b. Transverse wave
c. Surface wave
d. Longitudinal wave
Q. In immersion testing, the position of the search unit is often varied to transmit soundinto the test part at various angles to the front surface. Such a procedure is referred to as:
a. Angulation
b. Dispersion
c. Reflection testing
d. Refraction
Q. The angle of a refracted shear wave generated as a sound wave passes at an anglethrough an acoustic interface is dependant on:
a. The acoustic impedances of the materials of each side of the interface
b. The frequency of the incident sound wave
c. The wavelength of the incident sound wave
d. The hardness of the materials on each side of the interface
Q. Which of the following is a likely effect of a rough test piece surface?
a. An improved ultrasonic signal to noise ratio
b. A more penetrating sound beam
c. Loss of discontinuity signal amplitude
d. Higher test reliability
Q. Wavelength is:
a. The distance from the crest to the next trough of a sound wave
b. The time required for a sound wave to propagate from a trough to the next trough of a sound wave
c. The distance a sound wave travels in one second
d. The distance from trough to trough or from peak to peak of a sound wave
Q. The velocity of surface waves is approximatelyshear waves in the same material.
a. Two times
b. Four times
c. One half
d. Nine-tenths
Q. An ultrasonic instrument control which allows moving an A scan display to the left orright without changing the distance between any echoes displayed is called:
a. The sweep length or range control
b. The damping control
c. The sweep delay
d. The pulse length control
Q. A disadvantage of using natural quartz crystals in a search unit is that:
a. It will dissolve in water
b. It is the least effective generator of ultrasonic energy of all commonly used materials
c. It easily loses it operating characteristics as it ages
d. None of the above is correct
Q. The formula Sin A/Sin B = VA/VB is known as:
a. The Fresnell relationship
b. Snell's law
c. The law of sines
d. The critical velocity ratio
Q. A 25 MHz search unit would most likely be used during:
a. Straight beam contact testing
b. Immersion testing
c. Angle beam contact testing
d. Surface wave contact testing
Q. A technique in which two transducers are used, one on each side of the test piece, iscalled:
a. Angle beam testing
b. Modified immersion testing
c. Through transmission testing
d. Twinning
Q. Sound beam intensity is irregular in the area called:
a. The near field
b. The far field
c. The beam spread
d. The delay line
Q. A more highly damped transducer crystal results in:
a. Better resolution
b. Better sensitivity
c. Lower sensitivity
d. Poorer resolution
Q. The process of comparing an instrument or device with a standard is called:
a. Angulation
b. Calibration
c. Attenuation
d. Correlation
Q. Scattering of an ultrasonic beam is most pronounced when:
a. Material grain size and wavelength are comparable
b. Low frequency transducers are used
c. Large wavelengths are used for ultrasonic testing
d. None of the above