ET Level II Practice Test

1

A method of minimizing the effect of indications caused by
gradual dimensional changes while retaining the indications
caused by discontinuities is too:

1

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

1

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

1

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

1

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 them is varied is:

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

Tubing is generally inspected using:

1

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

1

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

1

Eddy current testing relies on the principle of:

1

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 B value when H has returned to zero is:

1

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

1

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

1

Doubling the number of turns on a coil will:

1

Frequency ratio, f/fg can be defined as:

1

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

1

A term used to define an instrumentation technique which discriminates between variables in the test part by the different phase angle changes which these conditions produced in the test signal is:

1

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

1

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

1

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

1

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

1

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

1

As the fill factor decreases, the impedance variation of a
pickup coil produced by a given change in conductivity will:

1

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

1

The magnetic domains in an unmagnetized ferromagnetic material are:

1

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:

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

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

1

It is frequently possible to separate the conductivity variable from the permeability and dimensional variables when using:

1

When eddy current testing by the ellipse method, the normal indication when the test specimen and reference standard are the same is approximately:

1

When eddy current testing by the ellipse method, one variable may be indicated by the angle of the ellipse or straight line while another variable may be indicated by the:

1

When eddy current testing by the linear time-base method, what is applied to the vertical deflection plates of a cathode ray tube when the test specimen and reference standard are the same and the balance controls are properly adjusted?

1

When eddy current testing by the linear time-base method, what is applied to the vertical deflection plates of a cathode ray tube when a condition of unbalance exists between the test specimen and the reference standard?

1

The conductivity value for a metal is a function of the:

1

The ratio of the specific diameter of a probe to the minimum discontinuity of interest should be:

1

Which of the following materials would be more likely used as a mounting material for a probe coil?

1

A term used to define a surface or internal rupture which is attributed to processing at too low a temperature or excessive working or metal movement during the forging, rolling, or extruding operation is:

1

A term used to define the timing relationships involved in alternating current signals is:

1

When eddy current testing a nonferrous material, the choice of test frequency is determined by the:

1

When testing ferrous materials, a small but detectable portion of the magnetic flux in the material will pass outside the metal when a surface discontinuity is encountered. This flux is called:

1

A term to define a property of a test system which enables the separation of signals due to discontinuities in the test specimen that are located in close proximity to each other is:

1

A term used to define a material having a permeability less than that of a vacuum is:

1

The inductive reactance of a coil is measured in units of:

1

Which of the following coil arrangements would eliminate or decrease the effects of minor variations in diameter, chemical composition, hardness, etc., which occur gradually along the length of a wire?

1

Which of the following conditions are not important when
selecting specimens to be used as reference standards?

1

An eddy current test coil's magnetic field intensity in air:

1

The circuits which make it possible to minimize the effect of signals caused by variables of no interest on the readout mechanism are based on differences in:

1

When a nonmagnetic rod is placed inside an eddy current test
coil:

1

The symbol commonly used to signify impedance is:

1

A decrease in conductivity is equivalent to:

1

If the conductivity of a test part in an eddy current test coil decreases, the magnitude of the eddy currents at a given depth in the test specimen:

1

When the voltage applied to a circuit and the current through the circuit both reach their maximums and minimums at the same time, the voltage and current are:

1

Which of the following is not a commonly used eddy current testing readout mechanism?

1

Which of the following materials would have the highest resistivity value?

1

The ratio of a material's flux density to a test coil's magnetizing force, (B/H), can be used to determine the
material's:

1

The magnetic field generated by eddy currents induced in a test specimen:

1

The impedance of a test coil usually can be represented by the vector sum of:

1

For age hardenable aluminum and titanium alloys, changes in hardness are indicated by changes in:

1

The penetration of eddy currents in a conductive material is
decreased when:

1

When the electrical current in an eddy current coil reverses
direction:

1

When testing magnetic materials in an ac field, increasing the field strength:

1

Impedance diagrams have been mathematically derived and experimentally verified for materials of any conductivity and permeability having rectangular, cylindrical, or spherical symmetry. To test all specimens of similar geometry under the same condition, it is only necessary to choose a test frequency, f, so that frequency ratio f/fg lies at the same point on the impedance diagram for each specimen. This principle is based upon:

1

To be useful, limit frequency equation must be:

1

When a rod is placed in an encircling type of coil, the density of eddy currents will be the greatest:

1

The term fill factor applies to:

1

An eddy current system using handling equipment with automatic marking of the defective areas primarily makes it possible to:

1

Two test coils are often used in a bridge circuit to:

1

When inspecting ferromagnetic materials, relatively low
frequencies are normally used because of the:

1

In modulation analysis testing, which of the following would not modulate the test frequency applied to the test coil?

NDE Technician Non Destructive Testing Quiz am ET Level II Practice Test , erstellt von Eugene Cawley am 18/12/2018.

ET Level II Practice Test

A method of minimizing the effect of indications caused by gradual dimensional changes while retaining the indications caused by discontinuities is too:

Which of the following methods may be used to improve the signal-to-noise ratio of an eddy current 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 them is varied is:

A term used to define the phenomenon where, at very high frequencies, the eddy current flow is restricted 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 expected output 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 test part characteristics 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 detected as variations in:

A term used to define two or more coils electrically connected in opposition such that any electromagnetic condition which is not common to both a test specimen and a reference 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 the secondary 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 B value 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 three major specimen parameters which influence eddy current testing are:

A method of minimizing the effect of indications caused by
gradual dimensional changes while retaining the indications
caused by discontinuities is too:

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 B value 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:

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

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

As the fill factor decreases, the impedance variation of a
pickup coil produced by a given change in conductivity will: