Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. Sound beam intensity decreases expontentially with distance in the area called:
a. The near field
b. The far field
c. The dead zone
d. The delay line
Q. AA test method employing two seperate search units on opposite surfaces of thematerial being tested is called:
a. Contact testing
b. Surface wave testing
c. Through-transmission testing
d. Lamb wave testing
Q. Which of the following is not (!) a requirement of a couplant?
a. Easy application
b. Highly penetrating
c. Harmless both to the test piece and transducers
d. Excludes all air between transducer and test piece
Q. A A plan view representation of a test piece is produced by which of the following?
a. A scan
b. B scan
c. C scan
d. A time line display
Q. A A widening of the front surface indication, when testing a rough surface, is caused by:
a. Defects in the test piece
b. A coarse grain structure
c. A partial reflection of ultrasonic beam side lobe energy
d. Ultrasonic instrument malfunction
Q. When a vertical indication has reached the maximum signal height which can be displayed or viewed on the CRT 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
Q. AA material used between the face of a search unit and the test surface to permit or improve the transmission of ultrasonic vibrations from the search unit to the material being tested is called:
a. A wetting agent
b. A couplant
c. A acoustic transmitter
d. A lubricant
Q. When an ultrasonic beam passes through the interface between two dissimilar materialsat an angle, a new angle of sound travel is formed in the second material due to:
a. Attenuation of ultrasound
b. Transmission of ultrasound
c. Compression of ultrasound
d. Refraction
Q. The velocity of sound waves is primarily dependent on:
a. The pulse length
b. The frequency
c. The material in which the sound is being transmitted and the mode of vibration
d. None of the above
Q. Piezoelectric ability is the property of a material to:
a. Become electrically conductive when heated above its critical temperature
b. Generate sound when heated above its critical temperature
c. Vibrate at high frequency when subjected to a temperature gradient
d. Produce an electric current when deformed and vice versa
Q. The boundary between two different materials which are in contact with each other iscalled:
a. A rarefactor
b. A refractor
c. An interface
d. A marker
Q. An ultrasonic insrument control which is used to adjust the sharpness of the CRTscreen display is called:
a. Astigmatism or focus
b. Pulse repetition rate
c. Pulse energy
d. Gain
Q. A A disadvantage of using a low frequency ultrasonic transducer is:
a. It provides better penetration in most materials
b. It provides poorer penetration in most materials
c. It provides a smaller beam angle and poorer resolving power
d. It provides a larger beam angle and poorer resolving power
Q. As transducer crystal thickness decreases:
a. Transducer wavelength increases
b. Frequency decreases
c. Frequency increases
d. None of the above
Q. On the area-amplitude ultrasonic standard test blocks, the flat-bottomed holes in theblocks are:
a. All of the same diameter
b. Different in diameter, increasing by 1/64 inch increments from the No. 1 block to the No. 8 block
c. Largest in the No. 1 block and smallest in the No. 8 block
d. Drilled to different depths from the front surface of the test block