Top 150+ Solved Magnetic Particle Testing Level 1 MCQ Questions Answer
Q. The reverse magnetising force necessary to remove a residual magnetic field from atest piece after it has been magnetically saturated is called:
a. Hysteresis
b. Coercive force
c. Demagnetising flux
d. Reverse saturation
Q. Magnetic lines of force enter and leave a magnet at:
a. Saturation
b. L/D ratios of greater than 4 to 1
c. Flux concentration points
d. Poles
Q. The ease with which a magnetic field can be established in a test piece is called:
a. Reluctance
b. Retentivity
c. Permeability
d. Electromagnetism
Q. The ability of a material to remain magnetic after the magnetising force is removed iscalled:
a. Reluctance
b. Retentivity
c. Permeability
d. Electromagnetism
Q. A magnetic field which is contained completely within the test piece is called a:
a. Confined field
b. Longitudinal field
c. Circular field
d. Saturated field
Q. Which of the following produces a circular field?
a. Coil
b. Head shot
c. Yoke
d. All of the above
Q. A technique used to find transverse discontinuities at the ends of longitudinallymagnetised bars by the use of transient currents is called:
a. A coil technique
b. A fast break technique
c. A yoke technique
d. A head shot
Q. The best method of inducing a circular field in a tube is by a:
a. Central conductor
b. Head shot
c. Coil
d. Prod technique
Q. Magnetic flux density is zero at:
a. The inside surface of a tube magnetised with a central conductor
b. The outside surface of a tube magnetised with a central conductor
c. The outside surface of a bar magnetised with a head shot
d. The centre of a bar magnetised with a head shot
Q. Magnetic flux density is highest at:
a. The outside surface of a non-ferromagnetic tube magnetised with a central conductor
b. The inside surface of a non-ferromagnetic tube magnetised with a central conductor
c. The outside surface of a ferromagnetic tube magnetised with a central conductor
d. The inside surface of a ferromagnetic tube magnetised with a central conductor
Q. The residual method is applicable to:
a. Surface discontinuities only
b. Subsurface discontinuities only
c. Either surface or subsurface discontinuities
d. All but tight surface cracks
Q. Highest sensitivity to fine surface cracks would be obtained by which of the followingtechniques?
a. Residual field, wet method
b. Residual field, dry method
c. Continuous field, wet method
d. Continuous field, dry method
Q. A residual field is always less than a continuous field because?
a. The magnetic field, as shown by a hysteresis curve, is zero when there is no magnetising force
b. The magnetic field, as shown by a hysteresis curve, is less when there is no magnetising force
c. The magnetic field, as shown by a hysteresis curve, is greater when there is no magnetising force
d. None of the above
Q. Where possible, circular magnetisation is preferable to longitudinal magnetizationbecause:
a. Less current is required
b. Stronger fields are obtained
c. Fewer confusing secondary poles are produced
d. None of the above is true
Q. Which of the following is a disadvantage of the dry method?
a. Ease of application with portable equipment
b. Superior sensitivity for fine surface cracks
c. Good particle mobility with AC and HWDC
d. Good sensitivity for subsurface discontinuities