Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. AA screen pattern containing a large number of low-level indications (often reffered toas ‘hash’) could be caused by:
a. A crack
b. A large inclusion
c. Coarse grained material
d. Fine grained material
Q. In an A scan presentation, the horizontal base line represents the:
a. Amount of refracted ultrasonic sound energy
b. Distance traveled by the search unit
c. Elapsed time or distance
d. None of the above
Q. An ultrasonic instrument control which is used to expand or contract the horizontalbase line of an A scan display is called:
a. The sweep length or range control
b. The damping control
c. The sweep delay
d. The pulse length control
Q. In a basic ultrasonic test pattern (A scan) for contact testing, the initial pulse (assumeno sweep delay is used):
a. Is the high indication on the extreme left side of the screen that represents the entry surface of the inspected part
b. Is the first pulse that occurs near the right side of the screen and represents the opposite boundary of the inspected part
c. Is an indication that appears and disappears during screening
d. Is always the second pulse from the left on the viewing screen
Q. AA term used in ultrasonics to express the rate at which sound waves pass throughvarious substances is:
a. Frequency
b. Velocity
c. Wave length
d. Pulse length
Q. Transducer focal lengths are normally specified as:
a. Distance in steel
b. Distance in aluminium
c. Distance in air
d. Distance in water
Q. The second critical angle is defined as the longitudinal wave incident angle whichresults in:
a. A refracted longitudinal wave of ninety degrees
b. A refracted shear wave of ninety degrees
c. Complete reflection of the sound beam
d. None of the above
Q. Spurious or nonrelevant indications might be suspected if:
a. Indications are unusually consistent in amplitude and appearance
b. There are strong indications in localised areas
c. The indications are localised and repeatable
d. None of the above
Q. A A disadvantage of lithium sulfate as a transducer material is that:
a. It is an inefficient receiver of ultrasonic energy
b. It is soluble in water
c. It is not piezo- electric
d. It has extremely coarse grain structure
Q. An advantage of using a ceramic transducer in search units is 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 has a very low mechanical impedance
d. It can withstand temperatures as high as 700oC
Q. The three most common modes of sound vibration are:
a. Longitudinal, compressional, and transverse waves
b. Longitudinal, transverse and rayleigh waves
c. Transverse, longitudinal and shear waves
d. Transverse, shear waves and rayleigh waves
Q. A A larger diameter crystal results in:
a. Greater beam spread
b. Lower penetrating power
c. Less beam spread
d. Greater penetrating power
Q. Entry surface resolution is a characteristic of an ultrasonic testing system whichdefines its ability to:
a. Detect discontinuities oriented in a direction parallel to the ultrasonic beam
b. Detect discontinuities located in the center of a forging containing a fine metallurgical structure
c. Detect minute surface scratches
d. Detect discontinuities located just beneath the entry surface in the part being tested
Q. Higher frequency transducers produce which of the following?
a. Greater beam spread, sensitivity and resolution
b. Greater sensitivity, resolution and penetration
c. Greater penetration, attenuation and resolution
d. Greater sensitivity, resolution and attenuation
Q. In immersion testing, verification that the search unit is normal to a flat entry surfaceis indicated by:
a. Maximum reflection from the entry surface
b. Proper wavelength
c. Maximum amplitude of the initial pulse
d. Elimination of water multiples