MT - MC Flashcards
Magnetic Particle is a non-destructive examination method used for?
a.) Locating surface discontinuities.
b.) Near surface (Sub Surface) discontinuities.
c.) Both a and b above.
d.) Material specification.
a.) Locating surface discontinuities.
b.) Near surface (Sub Surface) discontinuities.
c.) Both a and b above.
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.
a.) For colour contrast with the part surface.
b.) To enhance the detection of indications.
c.) For both a and b.
Which statement is true when related to Magnetic lines of force?
a.) They never cross.
b.) They are most dense at the poles of a magnet.
c.) They seek the path of least resistance.
d.) All of the above.
a.) They never cross.
b.) They are most dense at the poles of a magnet.
c.) They seek the path of least resistance.
d.) All of the above.
When a crack exists in a circular magnet, the attraction of magnetic particles to the crack is caused by?
a.) A coercive force
b.) A leakage field
c.) A dopier effect
d.) A high reluctance at the crack.
b.) A leakage field
The magnetizing field is strongest when?
a.) The magnetizing voltage is flowing.
b.) The magnetizing current is flowing.
c.) The material exhibits high coercive fore.
d.) The magnetizing current is no flowing.
b.) The magnetizing current is flowing.
Magnetic flux lines which are parallel to a discontinuity produces:
a.) Strong indications.
b.) Weak indications.
c.) No indications.
d.) Fuzzy indications.
c.) No indications.
A circular field may be induced into a specimen by which of the following methods?
a.) Direct induction (Head Shot).
b.) Direct induction (Prods).
c.) Central conductors.
d.) All of the above.
a.) Direct induction (Head Shot).
b.) Direct induction (Prods).
c.) Central conductors.
d.) All of the above.
An electrical yoke produces?
a.) A longitudinal field.
b.) A circular field.
c.) Alternating fields.
d.) A swinging field.
a.) A longitudinal field.
A coil around the part produces?
a.) A circular field.
b.) A longitudinal field.
c.) Either a or b depending on the type of current applied.
d.) An intermittent field.
b.) A longitudinal field.
A specimen may be demagnetized by which of the following methods?
a.) Heat treatment above Curie temperature.
b.) AC coil.
c.) Reversing DC fields.
d.) All of the above.
a.) Heat treatment above Curie temperature.
b.) AC coil.
c.) Reversing DC fields.
d.) All of the above.
A metal that is difficult to magnetize is said to have?
a.) A high permeability.
b.) Low permeability.
c.) High reluctance.
d.) Low retentivity.
b.) Low permeability.
Why is it preferable to disassemble parts before Magnetic Particle Inspection?
a.) Disassembly makes all surfaces areas visible.
b.) Interfaces wil create leakage fields which may confuse the inspection.
c.) It is usually easier to handle the disassembled parts.
d.) All of the above.
a.) Disassembly makes all surfaces areas visible.
b.) Interfaces wil create leakage fields which may confuse the inspection.
c.) It is usually easier to handle the disassembled parts.
d.) All of the above.
Fluorescent Magnetic Particle indications should be inspected under?
a.) Fluorescent light.
b.) Any light.
c.) Black light.
d.) Neon light.
c.) Black light.
A curve is sometimes drawn to show graphically the relation of the magnetizing force to the strength of the magnetic force to the strength of the magnetic field produced in a certain material. This curve is known as the?
a.) Magnetic force curve.
b.) Hysteresis curve.
c.) Saturation curve.
d.) Induction curve.
b.) Hysteresis curve.
What are the three causes of non-relevant indications?
a.) Lack of fusion, changes of section thickness, grinding cracks.
b.) Change of section thickness, very high amperage, and drilled hole near surface.
c.) Very high amperage, drilled holes near surface, blow holes.
d.) Drilled hole near surface, very high amperage, lack of fusion.
b.) Change of section thickness, very high amperage, and drilled hole near surface.
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.
a.) Sharp and distinct.
A metal that is difficult to magnetize is said to have?
a.) A high permeability.
b.) Low permeability.
c.) High reluctance.
d.) Low retentivity.
C. High reluctance
The magnetism which remains in a piece of magnetizable material after the magnetizing force has been removed is called the?
a.) Tramp field.
b.) Residual field.
c.) Damped field.
d.) Permanent field.
b.) Residual field.
What equipment is used to determine if a part has been demagnetized?
a.) A magnet on the part.
b.) Field meter.
c.) A survey meter.
d.) Carful observation for clinging magnetic particles.
b.) Field meter.
Why should pats be cleaned after demagnetization?
a.) To assure that the Magnetic Particles are removed.
b.) To prevent false indications.
c.) To save the solids of the suspension.
d.) To prevent cracking during heat treatment.
a.) To assure that the Magnetic Particles are removed.
If a current is passed through an electrical conductor, what will surround the conductor?
a.) Eddy current field.
b.) Current.
c.) Magnetic field.
d.) Residual field.
c.) Magnetic field.
The major factor that determines the success of magnetic particle inspection is the?
a.) Field strength.
b.) Voltage on magnetizing coil.
c.) Current through the coil.
d.) Time of magnetization.
a.) Field strength.
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 demagnetize it.
d.) The ability to retain the magnetic field.
a.) The ease with which it can be magnetized.
Which of the following can be tested by Magnetic Particle method?
a.) Iron.
b.) Nickel.
c.) Cobalt.
d.) All of the above.
a.) Iron.
b.) Nickel.
c.) Cobalt.
d.) All of the above.
