Magnetic Particle Testing (MT) Review Questions Flashcards
1
Q
1. Which of the following materials cannot be tested by magnetic particle techniques? A. High alloy steels B. Tool steels C. Copper alloys D. Ferritic stainless steels
A
C. Copper alloys
2
Q
2. Materials that are strongly attracted to a magnet are called: A. Manetized B. Nonmagnetic C. Ferromagnetic D. Magnetic
A
C. Ferromagnetic
3
Q
3. Magnetic lines of force (magnetic fields) are orientated in what direction in relation to the direction of the magnetizing current? A. Parallel B. At right angles C. At a 45 degree angle D. At random angles
A
B. At right angles
4
Q
- Magnetizing flux is a term that relates to:
A. Describing the direction of current flow in an electromagnet
B. The manner by which magnetic flows through space
C. The lines of force associated with a magnetic field
D. Permanent magnets only
A
C. The lines of force associated with a magnetic field
5
Q
- Subjecting a part to a magnetic field that is constantly reversing in polarity and gradually diminish in in strength accomplishes which of the following?
A. Magnetizing of the part
B. Demagnetization of the part
C. The residual magnetism is increased
D. Location of deep-lying discontinuities
A
B. Demagnetization of the part
6
Q
- Circular magnetization is useful in the detection of:
A. Circumferential cracks
B. Longitudinal cracks
C. Cracks in cylindrical parts at right angles to the long axis of the part
D. Deep lying discontinuities
A
B. Longitudinal cracks
7
Q
7. In which magnetizing method is the current passed directly through the part, thereby setting up a magnetic field at right angles to the current flow? A. Longitudinal magnetization B. Coil magnetization C. Central conductor magnetization D. Circular magnetization
A
D. Circular magnetization
8
Q
- Which of the following is a major disadvantage of using prods?
A. The magnetic field may be applied in the wrong direction
B. The inspection surface may be arc burned
C. Magnetic saturation may occur
D. The operators eyes may be burned by arc strikes
A
B. The inspection surface may be arc burned
9
Q
9. Inspecting a part by applying the magnetic particle suspension while the current is flowing is called? A. Continuous method B. Dry method C. Residual method D. Demagnetization method
A
A. Continuous method (Active field)
10
Q
- How is the inside diameter of a cylinder best magnetized?
A. By head shot
B. By using prods at either end
C. With a central conductor placed between contact heads
D. With the cylinder placed crosswise in a solenoid
A
C. With a central conductor placed between contact head
11
Q
11. The amount of amperage used for magnetic particle inspection using prods is based on the distance between the prods and the: A. Thickness of the part B. Length of the prods C. Diameter of the prods D. Total length of the part
A
A. Thickness of the part
12
Q
- Demagnetization of a part is usually not necessary is the part is:
A. Small
B. Inspected with the continuous method
C. To be hardened by heat treatment after inspection
D. High carbon steel to be welded after inspection
A
C. To be hardened by heat treatment after inspection
13
Q
- Which of the following is an advantage of the dry technique over the wet technique?
A. It is more sensitive for detecting fine surface cracks
B. It is more capable of providing full surface coverage on irregularly shaped parts
C. It is easier to use for field inspection with portable equipment
D. It is faster when testing many small parts
A
C. It is easier to use for field inspection with portable equipment
14
Q
- Fluorescent magnetic particles are used in preference to visible magnetic particles:
A. When parts are big and bulky
B. When working in the field
C. If parts are for railroad applciations
D. To increase the speed and reliability of detecting very small discontinuities
A
D. To increase the speed and reliability of detecting very small discontinuities
15
Q
15. The most versatile type of magnetic particle equipment is: A. A field kit B. The stationary horizontal machine C. The mobile power unit D. The automatic machine
A
B. The stationary horizontal machine
16
Q
- Magnetic particle inspection methods are recognized as superior to liquid penetrant techniques when the:
A. Surfaces of the test object are corroded
B. Surface is anodized
C. Parts are painted
D. Part is made from austenitic stainless steel
A
C. Parts are painted
17
Q
17. When using direct current, an indication is detected. What is the next logical step to determine if the indication results from a surface or subsurface confiscation? A. Reinspect using the surge method B. Demagnetized and apply powder C. Reinspect at higher amperage D. Reinspect using alternating current
A
D. Reinspect using alternating current
18
Q
- A requirement to use magnetic particle testing on a part should also include:
A. A fabrication and service manual
B. A statement on the drawing that requires a magnetic particle test
C. The procedure to be used and acceptance critera
D. The method of test and service conditions
A
C. The procedure to be used and acceptance criteria
19
Q
20. The best type of magnetizing current for inspection of fatigue cracks is: A. Direct current B. Alternating current C. Half-wave direct current D. Full wave rectified direct current
A
B. Alternating current
20
Q
21. A star-shaped indication is seen on the cover pass of a weld. What type of discontinuity is indicated? A. Cooling crack B. Crater crack C. Slag inclusion D. Arc burn
A
B. Crater crack
21
Q
- For maximum sensitivity in magnetic particle inspection of rough welds:
A. The weld should be wire brushed to remove slag and scale
B. Standard test weldments should be used for comparison
C. The weld bead should be coated with lacquer
D. The weld bead should be ground flush with the plate surface
A
D. The weld bead should be ground flush with the plate surface
