QUIZ) ASNT L3 MT 2

21. When establishing a magnetic particle procedure for a part to be used in a specific application, there are

many parameters that should be included in the procedure. Of the items listed below, which one has no

appreciable effect on the inspection results?

A. Type of magnetic particles

B. Type and amount of applied current

C. Direction of magnetizing field

D. Reference to applicable standards

22. When magnetic particle testing a welded pipe made from high alloy ferritic steel, a broad fuzzy, loosely

adhere indication show in the heat affected zone along the full length of the weld. Which of the

following best describes the probable cause of the indication?

A. Surface cracks

B. Permeability change at the heat affected zones

C. Lack of penetration

D. Geometry of the weld

23. Which type of magnetization device would you rather specify in cases where a large number of the

same test objects with very complicated geometries would to be fully magnetic particle tested

A. One circular shot along the largest current path through the part

B. One longitudinal shot along the largest path through the part

C. Two shot though the shortest path, one circular, one longitudinal

D. Multiple path magnetization, circular and longitudinal

24. Which type of magnetizing current would be best suited to find surface and subsurface discontinuities

with dry magnetic particles?

A. Direct current

B. Alternating current

C. Half-wave rectified alternating current

D. Full-wave rectified alternating current

25. Specifying a capacitor discharge/central conductor system for adequate magnetization of oil field tubular

or other long pipe, requires

A. no prior knowledge of the nature of the tubular product

B. a knowledge of the physical dimensions of the tubular product

C. a knowledge of the physical, electrical, and magnetic properties of the tubular product

D. the use of an impedance plane diagram and Foerster’s "limit frequency" equation

26. Which of the following is the most acceptable method of demagnetizing a part with a high quality

surface finish?

A. Head shot with AC

B. Alternating current coil with reducing current or withdrawing the part with the coil at constantcurrent

C. Head shot with DC step-down reversing current

D. AC yoke

27. A symmetrical hollow conductor of magnetic material is carrying direct current of same specified value

resulting in a field strength value of F on the outside surface. The tube is 2 inch O.D and 1 inch I.D. The

field strength at the inside surface of the conductor is

A. F/2

B. near zero

C. F/3

D. F/4

28. A magnetic particle examination must be performed to most effectively detect fatigue cracks in a

camshaft. The best selection is

A. direct current to obtain the most even distribution of field strength through the part

B. direct current to produce the highest concentration of field strength in the corners where cracks are more

likely to occur

C. alternating current because of the ease of demagnetization which is needed for rotating parts

D. alternating current to obtain the most even surface distribution of field strength following the contour

of the part

29. Wet bath magnetic particles have

A. lower retentivity than dry particles

B. different shape than dry particles

C. about the same coercive force as dry particles

D. lower coercive force than dry particles

30. The subsurface discontinuity most likely detected using magnetic particle examination of material

following primary processing is:

A. seams

B. forging laps

C. stringers

D. lamination

31. in coil magnetization is the ratio of the cross sectional area of the object within the coil to the

cross-sectional area of the coil

A. Fill factor

B. Effective field

C. Flux lines

D. Magnetic domains

32. Which type of the magnetizing current would be the most effective to find subsurface discontinuities?

A. Direct current

B. Alternating current

C. Half-wave rectified alternating current

D. Full-wave rectified alternating current

33. Which of the following methods of particle application must be employed when performing

multidirectional magnetism?

A. Wet method

B. Dry method

C. Continuous method

D. Residual method

34. A cylindrical part is to be tested using a headshot. The part has three different diameters along its length

The current level(s) would be based on

A. the largest diameter

B. the average diameter

C. each individual diameter

D. the L/D ratio for each section

35. When the current is doubled in a solid non-magnetic conductor the field strength at the

A. surface decreases to 1/2 the original

B. surface increases by a factor of two

C. center is increased by a factor of two

D. surface and center does not change

36. The most through method for insuring the removal residual magnetism is

A. heating the part above its curie point

B. AC coil demagnetization

C. reversing DC demagnetization

D. oscillating current demagnetization

37. Which of the following the least important reason for demagnetization of a material is that residual

magnetism can

A. interfere with welding

B. attract small metallic particles

C interfere with subsequent fabrication processes

D. interfere with electrostatic painting processes

38. Wet nonfluorescent particles are normally

A. pigmented in various colors

B. non pigmented ferromagnetic iron oxides

C. are made as fluorescent particles then have the fluorescent pigment removed

D. less sensitive than dry particles

39. Using alternating current to demagnetize a large cross-section object will often prove ineffective because

A. AC is ineffective on small cross-section parts

B. the part may not be perpendicular to the earth’s magnetic field

C. large AC coils require high currents

D. of the associated skin effect with AC

40. A magnetic particle technique used to interrogate the area affected by flux lines at the ends of

longitudinally magnetized test parts is referred as

A. parallel magnetization

B. multidirectional magnetization

C. induced longitudinal magnetization

D. quick break magnetization

 

 

 

 

 

 

answer

 

21	22	23	24	25	26	27	28	29	30
D	B	D	C	C	B	B	D	C	C
31	32	33	34	35	36	37	38	39	40
A	C	C	C	B	A	D	B	D	C