Top 150+ Solved Magnetic Particle Testing Level 1 MCQ Questions Answer
Q. Applying the theory of the ‘Right Hand Rule’, a longitudinal surface defect in a round bar is detected by ‘current passing in a direction parallel to the direction of expected defects’ because:
a. The current direction is in line with the defect
b. The magnetic field is at right angles to the defect
c. It makes no difference
d. The magnetic field is parallel to the defect
Q. Why are magnetic particles available in different colours?
a. For colour contrast with the part surface
b. To enhance the detection of indications
c. For both a and b
d. Different colours are used with different magnetic flux values
Q. A magnetic particle build-up from a discontinuity is strongest when the discontinuityis oriented:
a. 180o to the magnetic field
b. 45o to the magnetic field
c. 90o to the magnetic field
d. 90o to the current flow
Q. Why is it preferable to disassemble parts before magnetic particle inspection?
a. Disassembly makes all surface areas visible
b. Interfaces will create leakage fields which may confuse the inspection
c. It is usually easier to handle the disassembled parts
d. All of the above
Q. Fluorescent magnetic particle indications should be inspected under
a. Fluorescent light
b. Any light
c. Black light
d. Neon light
Q. Why should one avoid using a high velocity flow of a wet testing media over the testarea
a. It may wash away a fine or lightly held indication
b. This is not a problem
c. It may splash particle into eyes
d. None of the above are correct
Q. What are the three causes of non-relevant indications?
a. Lack of fusion, change of section thickness, grinding cracks
b. Change of section thickness, very high amperage, drilled hole near surface
c. Very high amperage, drilled hole near surface, blow holes
d. Drilled hole near surface, very high amperage, lack of fusion
Q. Magnetic particle inspection is not a reliable method of detecting
a. Laps
b. Deep seated cavities
c. Cracks
d. Seams
Q. A defect open to the surface produces an indication which is
a. Sharp and distinct
b. Wide and indefinite
c. Criss-cross
d. High and fuzzy
Q. Wet magnetic bath strength is checked by which of the following
a. Specific gravity
b. Optical density
c. Settling test
d. None of the above
Q. When preparing a bath it is important to have the bath strength at a proper level, as too many particles can result in:
a. Lowering the test amperage
b. Having to increase the magnetising current
c. Masking the indications
d. None of the above
Q. Magnetic particle is a non-destructive examination method used for:
a. Locating surface discontinuities
b. Near surface discontinuities
c. Both a and b
d. Material separation
Q. A part is adaptable to magnetic particle inspection if
a. It is attached to an electrostatic field
b. The material is ferromagnetic
c. The material is non-ferrous
d. The material is an electric conductor
Q. The permeability of a material describes:
a. The ease with which it can be magnetized
b. The depth of the magnetic field in the part
c. The length of time required to demagnetise it
d. The ability to retain the magnetic field
Q. If a crack exists in a circular magnet, the attraction of magnetic particles to the crack iscaused by:
a. A coercive force
b. A leakage field
c. A Doppler effect
d. A high reluctance at the crack