Eddy Current Practise

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Ndtputz

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Questions: 92 | Attempts: 3,204 | Updated: Mar 22, 2022

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Theory and application of non destructive testing method eddy current

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Current Version
Mar 22, 2022

Quiz Edited by
ProProfs Editorial Team
Apr 06, 2010

Quiz Created by
Ndtputz

Eddy Current Practise

A method of minimizing the effect of indications caused by gradual dimensional changes whileretaining the indications caused by discontinuities is to:

Which of the following methods may be used to improve the signal-to-noise ratio of an eddycurrent test system?

In order to decrease the effect on conductivity readings due to variations in test part thickness:

When testing by the eddy current method, discontinuities will be most easily detected when the eddy currents are:

A term used to describe the effect observed due to a change in the electromagnetic coupling between a test specimen and a probe coil when the distance of separation between themis varied is:

A term to define the phenomenon where, at very high frequencies, the eddy current flow is resrticted to an extremely thin outer layer of the conductor is:

The fill factor when a 1/2 inch diameter bar is inserted in a 1 inch diameter coil is:

The term used to define the difference between actual instrument output and expectedoutput as defined by a straight line calibration curve is:

Which of the following could be used to suppress unwanted high frequency harmonics?

The impedance change of an eddy current test coil due to a change in the test partcharacteristics can be most easily analyzed as a combined change in:

The inductive reactance of a test coil can be calculated using the formula:

When conducting an eddy current test, variations in the test material can be detectedas variations in:

A term used to define 2 or more coils electrically connected in opposition such that any electromagentic condition which is not common to both a test specimen and areference specimen will produce an unbalance in the system is:

Tubing is generally inspected using:

When testing small parts in an eddy current encircling coil for permeability measurements,which of the following test parameters may be considered important?

In a test coil consisting of both a primary and secondary winding, the voltage across thesecondary is a function of:

Eddy current testing relies on the principle of:

When the H field strength around a material is increased and then decreased to zero,the induction field B within the part does not return to zero, the term to define this Bvalue when H has returned to zero is:

The term used to define the value of H field required to decrease the remanence of a material to zero is:

The 3 major specimen parameters which influence eddy current testing are:

Doubling the number of turns on a coil will:

Frequency ratio f/f can be defined as:

When testing tubing, using an encircling (OD) coil, What is the phase relationship of the output signals from identical ID and OD discontinuities?

A term used to define an instrumentation technique which discriminates betweenvariables in the test part by the different phase angle changes which these conditionsproduce in the test signal is:

If the characteristic frequency (fq) of a material is 125 hz, the test frequency required to give an f/fq ratio of 10 would be:

At a fixed test frequency, in which of the following materials will the eddy currentpenetration be greatest?

The heating effect in magnetic materials caused by work required to rotate magneticdomains can be eliminated by:

A term used to define any change in a sinusoidal signal when the output is not a linearreproduction of the input is:

If the test frequency increases while field strength is held constant, the surface density:eddy current

As the fill factor decreases, the impedance variation of a pickup coil producedby a given chaange in conductivity will:

Which of the following would be easier to detect in tubing by the eddy currentmethod using self comparison differential coil arrangement?

The magnetic domains in an unmagnetized ferromagnetic material are:

When a magnetic material is placed in a region of an applied magnetizing force(H), magnetic field (B) is developed in the material by means of:

To eliminate any dependence upon the number of turns of a test coil, the inductancevalues of an impedance diagram are:

A term used to define a system which indicates only the magnitude of variations in the totalcoil impedance regardless of the phase or direction in which it occurs on an impedance plane is:

When eddy current testing tubing with a system that includes a frequency discriminating circuit,which of the following variables wolud be classified as a high frequency variable?

A major problem associated with eddy current test method is the:

The atoms of a metal showing magnetic characteristics are grouped into regions whichare the smallest known permanent magnets. These regions are called:

When a coil's magnetizing force is applied to a ferromagnetic material, the flux densityin the material is:

The flux density in a magnetic material is usually designated by the :

The magnetizing force of an eddy current test coil is usually designated by the:

In eddy current testing, the specimen is coupled to the test coil by:

The thickness of nonconductive coatings on a conductive base can be most simply measuredby:

The use of magnetic shielding around the exciting coil will generally:

Which of the following is not a factor that affects the inductance of an eddy current test coil?

The formula used to calculate the impedance of an eddy current test coil is:

An out-of-phase condition between current and voltage:

A term used to define a surface coil mounted so that the coil can be rotated about the circumference of a test specimen is:

A term used to define an eddy current test coil which uses magnetic material to purposelyshape the magnetic field is:

The vector-point, ellipse, and linear time-base methods are all subdivisions of the: