Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. During ultrasonic testing by the immersion method, it is frequently necessary to angulate the search unit when a discontinuity is located at an angle in order to:
a. Avoid a large number of back reflections that could interfere with a normal test pattern
b. Obtain a maximum response if the discontinuity is not originally oriented perpendicular to the ultrasonic beam
c. Obtain a discontinuity indication of the same height as the indication from the flat bottomed hole in a reference block
d. Obtain the maximum number of entry surface reflections
Q. Which of the following transducer materials is the most efficient receiver of ultrasonic energy?
a. Lead metaniobate
b. Quartz
c. Lithium sulphate
d. Barium titanate
Q. An ultrasonic wave in which particle displacement is 90 degrees to the direction ofwave propagation is called a:
a. Longitudinal wave
b. Shear wave
c. Compressional wave
d. Plate wave
Q. An advantage of using lithium sulphate in search units it that:
a. It is one of the most efficient generators of ultrasonic energy
b. It is one of the most efficient receivers of ultrasonic energy
c. It is insoluble
d. It can withstand temperatures as high as 700ºC
Q. Which of the following materials of the same alloy is most likely to produce thegreatest 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 materials
Q. The ability to separate echos from reflectors close together in depth is called:
a. Resolution
b. Attenuation
c. Accuracy
d. Sensitivity
Q. Greater depth of penetration in coarse grained material may be achieved using:
a. More sweep delay
b. Higher frequencies
c. Less sweep delay
d. Lower frequencies
Q. Lower frequency transducers produce:
a. Deeper penetration, greater attentuation and less beam spread
b. Deeper penetration, less attentuation and greater beam spread
c. Greater beam spread but higher sensitivity and resolution
d. Less beam spread but lower sensitivity and resolution
Q. Spurious indications might be caused by which of the following?
a. Mode conversion from beam spread in a long specimen
b. Surface waves generated during straight beam testing
c. A test piece with a smooth machined surface
d. All of the above
Q. The portion of a test piece which is represented by the CRT screen area from zero tothe rightmost edge of the initial pulse is called:
a. The dead zone
b. The near field
c. The near zone
d. The far zone
Q. The depth of penetration of surface waves is approximately:
a. One wavelength
b. Three wavelengths
c. 1/2 wavelength
d. The total part thickness
Q. An ultrasonic test using a straight beam contact search unit is being conductedthrough the thickness of a flat part such as a plate. This test should detect:
a. Laminar-type flaws with major dimensions parallel to the rolled surface
b. Transverse-type flaws with major dimensions at right angles to the rolled surface
c. Radial flaws with major dimensions along length but radially oriented to the rolled surface
d. None of the above
Q. The first critical angle is defined as the longitudinal wave incident angle which resultsin:
a. A refracted longitudinal wave of ninety degrees
b. A refracted shear wave of ninety degrees
c. Complete reflection of the shear wave
d. None of the above
Q. The number of complete waves which pass a given point in a given period of time(usually one second) is referred to as the:
a. Amplitude of a wave motion
b. Pulse length of a wave motion
c. Frequency of a wave motion
d. Wavelength of a wave motion
Q. The speed of sound in a given material depends on:
a. The specific acoustic impedance of the material
b. The acoustic impedance and density of the material
c. The density and elasticity of the material
d. The piezo-electric resistance of the material