Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. The most common method of demagnetising small test pieces is:
a. Heat treatment
b. Shot peening
c. Passing through an AC coil
d. Direct contact with AC current
Q. Demagnetisation with reversing DC is more effective than AC because:
a. DC is more penetrating
b. Demagnetisation is assisted by the skin effect
c. DC is more direct
d. Not true - AC is more effective
Q. The type of discontinuity which magnetic particle testing most effectively locates is:
a. Slag inclusions
b. Magnetic writing
c. Porosity
d. Surface cracks
Q. An indication which is formed when two pieces of magnetised steel come in contactwith each other is called:
a. A metallurgical discontinuity
b. Magnetic writing
c. Magnetic transfer
d. A ferromagnetic notch
Q. Magnetic particle test indications which are due to cold work can best be removed by:
a. Demagnetisation
b. Using a lower current
c. Re-crystallisation
d. Heat treating
Q. Which of the following might cause non-relevant indications?
a. Over magnetisation
b. Indications at the edges of a braze joint
c. A joint between hard and soft steels
d. All of the above
Q. An inspection for surface and subsurface discontinuities in ferromagnetic welds wouldbest be accomplished by which of the following techniques?
a. Prods
b. AC yoke
c. Half wave DC yoke
d. None of the above
Q. A continuous linear indication along the centre of a fillet weld would most likely be a:
a. Crater crack
b. Overlap
c. Root indication
d. None of the above
Q. Wet magnetic particle bath strength is checked by which of the following?
a. Specific gravity
b. Optical density
c. Settling test
d. None of the above
Q. Which of the following describes the best technique for applying dry magneticparticles to a test piece?
a. Dip the test piece in a tank of dry particles while current is flowing
b. Apply with an electrostatic spray gun at approximately 30 PSIG
c. Gently pour the powder onto the test piece
d. Shake or dust the powder onto the test piece with minimum velocity
Q. An advantage of AC equipment over DC is:
a. AC is more penetrating
b. AC is less hazardous
c. AC makes the magnetic particles more mobile on the test surface
d. AC equipment is heavier than DC
Q. Magnetic lines of flux which are parallel to a discontinuity produce:
a. Strong indications
b. Weak indications
c. No indications
d. Fuzzy indications
Q. The area of maximum induced field strength using a yoke is:
a. At the north pole of the yoke
b. At the south pole of the yoke
c. The area directly between the poles
d. On the outside of the pole pieces