ASNT Magnetic Particle Level III Review Questions and Answers
1. The magnetic domains in a permanent magnet fixed positions, predominantly in
are aligned: one direction
2. For which of the following would the wet flu- when increased speed and sensitiv-
orescent technique be preferred over the dry ity are desired
technique?
3. Gas, hot tears, cold shuts, shrinkage cracks and casting
sand inclusions are examples of defects result-
ing from which of the following processes?
4. Which of the following statements in not a valid if the part is to be radiographed after
reason for demagnetizing a part after complet- magnetic particle inspection, resid-
ing a magnetic particle test? ual magnetism may interfere with
the electromagnetic radiation spec-
trum
5. Subjecting a part to a magnetic field that is demagnetizes the part
constantly reversing in polarity and gradually
diminishing in strength accomplishes which of
the following?
6. The concentration of the solid content in a sus- permitting the solids to settle out of
pension of magnetic particles is measured by: suspension
7. An important factor that must be considered alloy, shape, and condition of the
when selecting a method of magnetization is part
the:
8. When a magnetic material reaches its curie tem- paramagnetic
perature, the material becomes:
9. the parts are painted
1/7
, ASNT Magnetic Particle Level III Review Questions and Answers
Magnetic particle inspection methods on ferro-
magnetic materials are recognized as superior
to liquid penetrant techniques when:
10. A paramagnetic material: is slightly magnetic
11. Which of the following will reduce a magnetic move the alternating current coil far-
field? ther away from the part
12. When an external magnetizing force is re- coercive force
moved, some of the magnetic domains remain
preferentially oriented. The additional force re-
quired to return them to their original random
orientation is commonly referred to as:
13. When a cylinder is magnetized by a central con- at the inside surface of the cylinder
ductor, the field is most intense:
14. When is the magnetic field strongest in an ob- while the magnetizing current is ap-
ject inspected by the magnetic particle meth- plied
ods?
15. Which of the demagnetization methods listed is direct current with alternating cur-
most effective? rent with step-down control
16. When using the longitudinal magnetization 3000A
method to inspect a bar 152 mm (6 in.) long and
51 mm (2 in.) in diameter
with a 5-turn coil, which of the following amper-
age values should be used?
17. To examine a part 127 mm (5 in.) long and 51 3600A
mm (2 in.) in diameter using a 5-turn coil and
head stock magnetic
2/7
1. The magnetic domains in a permanent magnet fixed positions, predominantly in
are aligned: one direction
2. For which of the following would the wet flu- when increased speed and sensitiv-
orescent technique be preferred over the dry ity are desired
technique?
3. Gas, hot tears, cold shuts, shrinkage cracks and casting
sand inclusions are examples of defects result-
ing from which of the following processes?
4. Which of the following statements in not a valid if the part is to be radiographed after
reason for demagnetizing a part after complet- magnetic particle inspection, resid-
ing a magnetic particle test? ual magnetism may interfere with
the electromagnetic radiation spec-
trum
5. Subjecting a part to a magnetic field that is demagnetizes the part
constantly reversing in polarity and gradually
diminishing in strength accomplishes which of
the following?
6. The concentration of the solid content in a sus- permitting the solids to settle out of
pension of magnetic particles is measured by: suspension
7. An important factor that must be considered alloy, shape, and condition of the
when selecting a method of magnetization is part
the:
8. When a magnetic material reaches its curie tem- paramagnetic
perature, the material becomes:
9. the parts are painted
1/7
, ASNT Magnetic Particle Level III Review Questions and Answers
Magnetic particle inspection methods on ferro-
magnetic materials are recognized as superior
to liquid penetrant techniques when:
10. A paramagnetic material: is slightly magnetic
11. Which of the following will reduce a magnetic move the alternating current coil far-
field? ther away from the part
12. When an external magnetizing force is re- coercive force
moved, some of the magnetic domains remain
preferentially oriented. The additional force re-
quired to return them to their original random
orientation is commonly referred to as:
13. When a cylinder is magnetized by a central con- at the inside surface of the cylinder
ductor, the field is most intense:
14. When is the magnetic field strongest in an ob- while the magnetizing current is ap-
ject inspected by the magnetic particle meth- plied
ods?
15. Which of the demagnetization methods listed is direct current with alternating cur-
most effective? rent with step-down control
16. When using the longitudinal magnetization 3000A
method to inspect a bar 152 mm (6 in.) long and
51 mm (2 in.) in diameter
with a 5-turn coil, which of the following amper-
age values should be used?
17. To examine a part 127 mm (5 in.) long and 51 3600A
mm (2 in.) in diameter using a 5-turn coil and
head stock magnetic
2/7
