MT_CIDB_EOCGEN

Materials which are not attracted (even very slightly) to a permanent magnet are referred to as being:

• paramagnetic

• ferromagnetic

• antistatic

• diamagnetic

For components that have a length to diameter ratio of less than 5 extender bars may be required if the component is to be tested using:

• axial current flow

• magnetic flow

• a rigid coil

• a central conductor

When extender bars are needed for a given MPI test such bars should be made from:

• copper

• aluminium

• low carbon steel

• 316L stainless steel

The magnetising method that is least reliable for the detection of surface cracks is:

• HWRAC prods

• permanent magnet

• AC yoke

• axial current flow

In MPI a 'keeper' is:

• a piece of steel or iron used to bridge the poles of a horseshoe magnet when the magnet is not in use

• a kind of flux indicator

• a bottle used to store a control sample of magnetic ink

• any material that becomes permanently magnetised

Magnetic ink is an example of:

• a solution

• an emulsion

• a suspension

• an admixture

If magnetising force = H and magnetic flux density = B the permeability of the material is equal to:

• B/H (B divided by H)

• H/B (H divided by B)

• BxH(H multiplied by B)

• HB (H to the power B)

The main requirement for a material that is to be used to manufacture magnetic particles is:

• high retentivity

• high reluctance

• high permeability

• high coercive force

What is the term referred to when there is an increase in magnetizing force but there is no increase in flux density?

• Retentivity.

• Saturation

• Coercive force.

• Residual magnetism

The instrument used to measure black light intensity is called a:

• photometer

• luxmeter

• lightmeter

• radiometer