The magnitude of a magnetic induction field at a perpendicular distance 'r' from the centre of a long straight conductor with a current 'I' amperes is

A vigorous or cascading application of magnetic particle bath can

A Hall detector can be used to measure

Vapour degreasing would not be an effective cleaning method for which material?

The lagging of flux density (B) behind the magnetizing force (H) is called

The wavelength of blacklight used in fluorescent magnetic particle testing is usually around

When a tubular part is MPI tested using a head shot where the current is passed through the tube itself the field strength on the inside surface of the tube compared to the outside is

The core material used in an electromagnet is

In a magnetic circuit, which is equivalent to an electric circuit, the magnetic equivalent to electrical current is

A defect oriented with its major plane at right angles to the principal tensile stress is _________ compared to the same defect not a right angles to this stress.

As result of a head shot, the magnetic lines of force take the general form of

Although total blacklight energy output of a bank of blacklight tubes may be about equal to a 100W mercury vapour lamp their irradiance is lower because

MPI field meters are now provided with two units on the meter face, they would be

The mercury vapour arc was selected as a blacklight source because its spectrum

When performing visible MPI, lighting on the work surface

UV filters used in fluorescent indication photography ;are sometimes called

Although it is possible to magnetize a material whose maximum permeability is 100, a limiting factor might be

Magnetic dipole moment is a

A hysteresis loop is used to demonstrate a materials' _________.

Ease of demagnetization depends on

The opposition to the formation of a magnetic flux in a magnetic circuit is referred to as

Detection of MPI indications is accomplished by

In the retina the cells responsible for collecting light to visualize images are the

Non-imaging scanners used for indication detection in visible MPI testing systems detect

When performing MPI with an A.C. yoke on a painted surface

At very low light levels (<0.03 cd/mý) colour differentiation is best for

The large 400W flood lamp blacklights are used primarily for

If cleaning the filter does not correct low intensity of your blacklight during an intensity test your next step would logically be to

If a part is MPI tested using D.C. and an indication is located how would you estimate depth if it was not surface breaking?

Magnetic circuits are equivalent to electric circuits hence have an equivalent equation to Ohm's law, the term equivalent to electrical resistance in magnetics is

A Gauss-meter is a device used in conjunction with a ___________ to determine field strength.

The advantage of the Burmah-Castrol strip over other portable surface field indicators is

The ballast in the power supply for the blacklight is a(n)

A metal that can be easily bent or permanently distorted without rupturing is considered

Which stage of processing can magnetic particle testing be used?

Localized cold working of steel can result in non-relevant indications. These result from local increased hardness and are removed by

Which of the following has the highest flux density at magnetic saturation?

What is the only acceptable means of determining if magnetization is adequate when the residual method is used?

Hot working an ingot may produce a product which has:

A coil shot is not effective if the ratio of the long to short dimension is less than

Which of the following statements is correct?

The degree to which a material holds a residual magnetic field is termed

The purpose of a swinging field set up for MPI testing is to

Using a Ketos ring and holding all test parameters constant except for fluorescent particle concentration; hole detectability _________ with increasing particle concentration

Polarizing filters are used in MPI indication photography for what purpose?

The written document outlining the test parameters and acceptance criteria for a specific product is a

The pressure sensitive tape transfer technique recording MPI indications is used on

When you move half the prod spacing from the midpoint of the prod centre-line the field is

The ability of the magnetic particle method to detect subsurface defects is not determined by

To accelerate drying of oil based vehicles off an MPI test piece so a tape transfer of indications can be made you could

A marked increase in background blue fluorescence of the oil vehicle of an MPI bath as compared to the reference sample indicates

Setting speed of an MPI bath sample is accelerated by

A problem with performing an MPI test on a part that does not have its thin layer of paint or plating removed is

Which of the following is an advantage of video tape recording of MPI indications?

What is the condition reached in a ferromagnetic material subjected to a D.C. magnetizing current when the incremental permeability is unity?

Laboratory studies of magnetic hysteresis properties of ferromagnetic materials are done using

The slope of the virgin magnetization curve at the origin of a hysteresis plot is called the

A forming operation which results in the greatest dimensional accuracy is:

Cobalt-samarium is considered one of the "super magnets" having a coercivity of several million Oersteds. How would you easily demagnetize it?

The purpose of some manufactures providing a perforated metal strip to be placed over the sensor of the UV meter is to

The purpose of the soft iron keeper used in conjunction with a permanent horseshoe magnet is

Two long conductors (wires) are placed parallel and near to each other. When current flows in the same direction in both wires there will exist a

The purpose of arranging a Hall detector at the mouth or apex of a ferrite ring (ferrite C-core) is to

In the settling test for MPI, 3 components can occur, lint and dust, metal grindings and magnetic particle oxides. Which will be the first to settle out.

Magnetic particle inspection quantitative quality indicators can be used for

Seams in barstock formed as a result of over filled rolls are usually

The field strength of an A.C. magnetizing coil is about 36% of the surface value at a depth of 1mm into a steel piece. About what percentage of the surface field strength would exist 4mm from the surface?

A magnetic particle cluster resulting from a true leakage field but not originating from a metal flaw is a(n)

The difference between ferroprobes and flux gate magnetometers is

The internal magnetic intensity of a specimen brought into an external magnetizing field will always __________ the applied field.

In the shielded metal-arc process, the electrode covering may include materials used to:

Which of the following welding processes does not involve melting of the parts to be joined?

Eddy current testing can also be used to detect surface and sub-surface defects on ferromagnetic materials but is usually inferior to magnetic particle testing because of

Shafts, drums and girders can be _______ magnetized by coiling a flexible cable around the part and passing a current through the cable.

The purpose of the iron core in an electromagnet is to

Another term for the capacitive discharge method of producing magnetizing current is

When a current is passed directly through a part the magnetization that results is considered to be

A method commonly used to remove a number of flaws in an ingot prior to forming is:

A circularly magnetized bar 2 inches in diameter carrying 1000 amps will have a field strength _________ a bar of the same material having a diameter of 4 inches carrying 1000 amp current.

The reheating of a heat treated metal, such as with a welding torch

The typical size range for wet magnetic particles is

A fatigue crack is a service defect that is caused by a:

When a part is magnetized by a current flow of very brief duration it is said to be

An advantage of shell molding over green sand molding is:

The advantage of the He-Cd laser used by the flying spot scanning system for automated fluorescent MPI, as compared to television imaging systems is

When a D.C. bench unit, that does not have the step down demagnetizaion option built in, is used to demagnetize a part with a cable wrap, how is current reversal achieved?

Which of the following might be considered a disadvantage of magnetic particle testing?

Two long conductors (wires) are placed parallel and near to each other. When current flows in opposite directions in both wires, there will exist a

In the swinging field method of MPI testing the application of the test medium (particles) is

Light intensity requirements for daylight fluorescent dry magnetic particles are

When it may be possible to damage parts exposed to magnetic particles or the liquid vehicle the inspector may have to

The double coil system, whereby a tube to be MPI tested is passed through 2 coils arranged in tandem was designed to

Maximum practical prod spacing is about

The left hand rule for determining magnetic field direction applies to

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

Current distribution in a part MPI tested using prods depends on

Blowholes not welded shut in subsequent rolling processes can result in

In pulsed or capacitor discharge magnetization, pulse effectiveness is dependent on

In the MPI indication recording technique that utilizes fixing coatings the purpose of the spray coating is to

To avoid an MPI bath washing an indication away when the current is removed you can