Top 80+ Solved Magnetic Particle Testing Level 2 MCQ Questions Answer
Q. Among the following, the best type of current for the detection of fatigue cracks is:
a. Half-wave direct current
b. Alternating current
c. Direct current
d. Half-wave alternating current
Q. Continuous magnetization provides the most sensitivity because:
a. The magnetic particles are present while the part is being magnetized
b. The magnetic field is greatest while the magnetizing current is on
c. All of the above
d. Neither of the above
Q. The sensitivity of magnetic particle testing is greatest when the discontinuity is:
a. Parallel to the direction of the magnetic flux lines
b. Perpendicular to the flow of the magnetizing current
c. Perpendicular to the direction of the magnetic flux
d. Perpendicular to the line between prods
Q. To provide reliability and reproducibility in magnetic particle testing, writtenprocedures should include:
a. Location of the coil and current for each magnetization
b. Requirements for ammeter calibration
c. Type and concentration of the particles
d. All of the above
Q. The magnetic particles are noticed to bunch in some fillet areas and stand on end onthe edge of a part being magnetized. These observations indicate that the:
a. Particle concentration is too low
b. Flux density is excessive
c. Flux density is too low
d. Magnetizing current should be changed form AC to DC
Q. Flux density is a measure of the number of magnetic flux lines perpendicular to an area of cross-section. If a discontinuity is in the plane of the unit area, the strongest magnetic article indication will be formed when the discontinuity is:
a. Inclined at 45º to the flux lines
b. Parallel to the flux lines
c. 90º to the flux lines
d. 135º to the flux lines
Q. Prods are being used to magnetize a weld area. When dry powder is dusted on the surface, it is observed that there is no mobility of the particles. What is the most probable reason for this observation?
a. The magnetizing current is not high enough
b. The flux density is too low
c. DC is being used
d. All of the above are possible reasons
Q. The current from portable high amperage units can be applied to the object using:
a. Prods
b. Cable coils
c. Pre-wrapped coils
d. All of the above
Q. How can parts be tested to determine if they have been adequately demagnetized?
a. By bringing a suspended paper clip near the middle of the part
b. By using a small horseshoe permanent magnet
c. By using a small magnetometer held at a corner of the part
d. By sprinkling some magnetic particles on the part
Q. The statement ‘magnetic particle testing can be applied to plated and painted parts’.
a. May be true depending upon the thickness of the coating
b. May be true if flux densities are increased to compensate for the coating thickness
c. Is true only for circular circumstances
d. Both (a) and (b)
Q. A group of indications, some sharp and some broad and fuzzy, were found on an area of a small forging. Demagnetization and re-inspection eliminated these indications. What was the probable cause?
a. Forging lap
b. Magnetic writing
c. Change in permeability
d. Subsurface variation
Q. Magnetic particle testing is most likely to find subsurface discontinuities in:
a. Soft steels with high permeability
b. Soft steels with low permeability
c. Hardened steels with low permeability
d. Hardened steels with high permeability
Q. Which of the following is not an advantage of Magnetic Particle testing?
a. Fast and simple to perform
b. Can detect discontinuities filled with foreign material
c. Most reliable for finding surface cracks in all types of material
d. Works well through a thin coat of paint
Q. The most effective NDT method for locating surface cracks in ferromagnetic materials is:
a. Ultrasonic testing
b. Radiographic testing
c. Magnetic particles testing
d. Liquid penetrant testing
Q. Opposition to establishment of a magnetic field in a test piece is called:
a. Reluctance
b. Retentivity
c. Permeability
d. Electromagnetism