Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. Which of the following can be a source of spurious ultrasonic signals?
a. Surface roughness of the test piece
b. Mode conversion within the test piece
c. Shape or contour of the test piece
d. All of the above
Q. A noisy base line, or hash may result in:
a. Laminations in the test piece
b. Discontinuities at an angle to the test piece surface
c. Large grain size
d. Fatigue cracks
Q. Sound waves which travel on the surface of a solid in a manner similar to waves on awater surface are called:
a. Rayleigh waves
b. Shear waves
c. Primary waves
d. Compression waves
Q. Lamb waves are formed in a part which has:
a. A thickness greater that about ten wavelengths
b. A thickness approximately equal to the wavelength
c. Low acoustic impedance compared to the transducer crystal material
d. A thickness of about four wavelengths
Q. Which type(s) of sound wave modes will propagate through liquids?
a. Longitudinal
b. Shear
c. Surface
d. All of the above
Q. When the motion of the particles of a medium is transverse to the direction ofpropagation, the wave being transmitted is called a:
a. Longitudinal wave
b. Shear wave
c. Surface wave
d. Lamb wave
Q. Which of the following test frequencies would generally provide the best penetrationin a 12 inch thick specimen of coarse-grained steel?
a. 1.0 MHz
b. 2.25 MHz
c. 5.0 MHz
d. 10 MHz
Q. An oscilloscope display in which the screen base line is adjusted to represent the oneway distance in a test piece is called a:
a. A scan display
b. B scan display
c. C scan display
d. D scan display
Q. A common use of ultrasonic testing is:
a. Cleaning
b. Detecting of sub-surface indications
c. Determination of the test piece ductility
d. Communications
Q. The cable that connects the ultrasonic instrument to the search unit is specially designedso that one conductor is centred inside another. The technical name for such a cable is:
a. BX cable
b. Conduit
c. Coaxial cable
d. Ultrasonic conductor cable grade 20
Q. As ultrasonic frequency increases:
a. Wavelength increases
b. Wavelength decreases
c. Sound velocity increases
d. Sound velocity decreases
Q. In an A scan presentation, the amplitude of vertical indications on the screen representsthe:
a. Amount of ultrasonic sound energy returning to the search unit
b. Distance travelled by the search unit
c. Thickness of material being tested
d. Elapsed time since the ultrasonic pulse was generated
Q. Loss of the test piece back wall echo during scanning may be caused by:
a. An abnormally homogeneous material structure
b. A smooth entry surface on the test piece
c. A discontinuity which is not parallel to the entry surface
d. An opposite surface which is parallel to the entry surface