Top 150+ Solved Magnetic Particle Testing Level 1 MCQ Questions Answer
Q. Retentivity:
a. Represents the ability to induce magnetism in a ferromagnetic body by an outside magnetising force
b. Represents the ability of a material to resist the establishment of magnetic flux within it
c. Represents the ability of a material to retain a portion of the magnetic field set up in it after the magnetising force has been removed
d. Is not a term used in magnetic particle testing
Q. Demagnetisation:
a. May be easy or difficult depending on the type of material
b. Is easy for materials having a high coercive force
c. Is always most difficult in materials retaining a high residual field
d. All of the above answers are correct
Q. What rule describes the direction of current flow (+ to -) when lines of magnetic forcesurround a conductor?
a. Left hand rule
b. Right hand rule
c. Flux rule
d. Reluctance rule
Q. The proper number of ampere-turns for a given test specimen is determined by:
a. Its length
b. The material and its diameter
c. Both the length and the material
d. Its diameter and length
Q. An electrical yoke produces:
a. A longitudinal field
b. A circular field
c. Alternating fields
d. A swinging field
Q. In longitudinal magnetisation the proper term for calculating magnetising force is:
a. Amperes
b. Ampere-turns
c. Watts
d. Ohms
Q. The amount of amperage used for magnetic particle inspection using the prod methodis determined from the:
a. Type of material
b. Distance between the prods
c. Diameter of the part
d. Total length of the part
Q. Which of the following is the most effective method for the detection of extremelydeep-lying defects:
a. Dry residual method using DC surge
b. Wet continuous method using half wave rectified current
c. Wet residual method
d. Dry continuous method using half wave rectified current with prods
Q. What method provides greater sensitivity, particularly in locating subsurfacediscontinuities?:
a. Continuous
b. Residual
c. Circular
d. Longitudinal
Q. Which type of current has a ‘skin effect’:
a. AC
b. DC
c. Half wave rectified
d. Full wave rectified
Q. When using the wet continuous method, the flow of suspension from the hose shouldbe shut off:
a. Immediately after applying the current
b. Immediately before applying the current
c. While the current is flowing
d. Thirty seconds before applying the current
Q. The area of maximum induced field strength using a yoke is:
a. At the north pole of the yoke
b. At the south pole of the yoke
c. The area directly between the poles
d. on the outside of pole pieces
Q. The strongest magnetic field in a coil is at the:
a. Outside edge
b. Inside edge
c. Centre
d. End
Q. What equipment is used to determine if a part has been demagnetised?
a. A magnet on the part
b. A field meter
c. A survey meter
d. Careful observation for clinging magnetic particles
Q. Which of the following will best define surface cracks?
a. Half wave rectified AC
b. DC
c. AC
d. Surge current