MT – LEVEL 2

Level 2 MT

1 / 25

Which of the following is a disadvantage of the wet method?

Is the most sensitive method for detection of very fine surface cracks

Rapid testing of large quantities of small test pieces

Excellent detection of completely subsurface discontinuities:;1

2 / 25

Where particles are attracted to a site on the surface of a part by a magnetic leakage field that is caused by a condition such as a crack, lap or other condition not acceptable to the applicable standards for the part, then we have

A defect

An indication

A discontinuity

A non-relevant indication

3 / 25

If a copper conductor is placed through a ferrous cylinder and a current is passed through the conductor, then the magnetic field (flux density) in the cylinder will be

Less that in the conductor

Greater that in the conductor

The same intensity and pattern as in the conductor

The same regardless of its proximity to the cylinder wall

4 / 25

The relative magnetic permeability is dependent on:

The specific properties of the material tested

The strength of the applied field

The L/D ratio

Both a and b

5 / 25

Wearing of UV absorbing glasses has its advantage in that:

Ocular fluorescence is completely eliminated

Contrast is increased

Sensitivity is improved

All of the above

6 / 25

The ability of matter to attract other matter to itself is a phenomenon associated with

Magnetism

Field strength

Pole strength

Coercive force

7 / 25

When demagnetising a ring-shaped object by passing it through a coil you would:

Pass it through such that its diameter is parallel to the coil axis and it is held vertical

Pass it through such that its diameter is parallel to the coil axis and it is held horizontal

Roll it through the coil

8 / 25

Materials which are repelled magnetically are called

Diamagnetic

Nonmagnetic

Paramagnetic

Ferromagnetic

9 / 25

In what way can a magnetic field be reduced?

Reduce the current

Move the part further away from the coil

Move the coil further away from the part

All of the above

10 / 25

An important factor that should be considered when selecting a method of magnetisation is:

Field strength value

Available equipment

Configuration of the part

All of the above

11 / 25

The general term used to refer to a break in the metallic continuity of the part being tested is

Discontinuity

Crack

Seam

Lap

12 / 25

Which of the following is not an advantage of magnetic particles testing?

Fast and simple to perform

Can detect discontinuities fill with foreign material

Most reliable for finding surface cracks in all types of material

Works will through a thin coat of paint

13 / 25

Residual magnetisation may be beneficial as an aid:

In the deposition of weld metal

In interpretation and evaluation of indications

In demagnetisation

All of the above

14 / 25

An example of a non-relevant indication that would be classed as a magnetic discontinuity rather than an actual discontinuity could be caused by

Corrosion

A slag pocket

Grinding cracks

A known abrupt change in the hardness of the part

15 / 25

If a copper conductor is placed through a ferrous cylinder and a current is passed through the conductor, then the magnetic field (flux density) in the cylinder will be:

Less than in the conductor

Great than in the conductor

The same intensity and pattern as in the conductor

The same regardless of its proximity to the cylinder wall

16 / 25

The lines of flux or force in a circularly magnetized ferromagnetic bar:

Are aligned through the piece from the south to the north pole

Are aligned through the piece from the north to the south pole

Are contained within and around the part

17 / 25

The magnetisation experienced by a ferromagnetic material brought into the influence of an outside magnetic field is called:

Remote field

Inductance

Leakage magnetisation

Transduction

18 / 25

Since the magnetic lines of force within a bar magnet run the length of the bar, it is said to be

Randomly magnetized

Circularly magnetized

Permanently magnetized

Longitudinal magnetized

19 / 25

In order to detect detects in different directions in a material by magnetic particle inspection, it is best to use

Only one field

Other probe locations

A high frequency field

Two or more fields in different directions

20 / 25

One disadvantage of using a single-phase magnetic particle unit at current input values over 600 A, in comparison with a three-phase unit is, the single-phase unit will

Detect only surface discontinuities

Not detect subsurface discontinuities

Require 1.73 times more input current

Require 1.73 less input current

21 / 25

When adding concentrate to any wet magnetic particle suspension fluid, it is common practice to:

Add powder directly to the suspension fluid

Make a small, slurry-like test mixture of the powder

Do both of the above

Do neither of the above

22 / 25

The statement "magnetic particle testing can be applied to plated and painted parts"

May be true depending upon the thickness of the coating

May be true if flux densities are increased to compensate for the coating thickness

Is true only for circular circumstances

Both (a) and (b)

23 / 25

The detection of deep-lying defects in heavy weldments 6-51mm below surface is:

Very similar to the detection of surface cracks

Not difficult if the defect is attributable to fine porosity

Very improbable

24 / 25

The Interpretation of magnetic particle indications may be aided by:

Observing with a magnifying glass

reproducing the indication after demagnetization

Observing the indications after the part is pre-cleaned

Observing the indications after the part is post-cleaned

25 / 25

For direct contact magnetising methods, current should be flowing in what direction relative to expected discontinuities:

Parallel

At 45 degrees

At 90 degrees

At 180 degrees

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