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Here you can take a free ASNT NDT ET Level 2 Exam Practice Test with the latest Eddy Current Testing Method Level II Questions and Answers.

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:

 
 
 
 

2.

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

 
 
 
 

3.

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

 
 
 
 

4.

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

 
 
 
 

5.

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

 
 
 
 

6.

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:

 
 
 
 

7.

The fill factor when a 13 mm (0.5 in.) diameter bar is inserted in a 25 mm (1 in.) diameter coil is:

 
 
 
 

8.

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

 
 
 
 

9.

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

 
 
 
 

10.

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:

 
 
 
 

11.

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

 
 
 
 

12.

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

 
 
 
 

13.

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. the system is:

 
 
 
 

14.

Tubing is generally inspected using the:

 
 
 
 

15.

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

 
 
 
 

16.

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

 
 
 
 

17.

Eddy current testing relies on the principle of:

 
 
 
 

18.

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 defines this B value when H has returned to zero as:

 
 
 
 

19.

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

 
 
 
 

20.

The three major specimen parameters that influence eddy current testing is:

 
 
 
 

21.

Doubling the number of turns on a coil will:

 
 
 
 

22.

The frequency ratio, f/fg, can be defined as:

 
 
 
 

23.

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

 
 
 
 

24.

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

 
 
 
 

25.

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:

 
 
 
 

26.

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

 
 
 
 

27.

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

 
 
 
 

28.

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

 
 
 
 

29.

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

 
 
 
 

30.

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

 
 
 
 

31.

The abscissa values on the impedance plane are shown in Figure 2 is given in terms of:

Figure-2.png

 
 
 
 

32.

In Figure 2 (an impedance diagram for a solid non-magnetic rod), the fg or characteristic frequency is calculated by the formula:

Figure-2.png

 
 
 
 

33.

In Figure 2, a change in the f/fg ratio will result in:
Figure-2.png

 
 
 
 

34.

In Figure 3, the solid curves are plots for different values of:
Figure-3.png

 
 
 
 

35.

Figure 4 illustrates the fact that eddy current responses:
Figure-4.png

 
 
 
 

36.

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

 
 
 
 

37.

The magnetic domains in an unmagnetized ferromagnetic material are:

 
 
 
 

38.

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

 
 
 
 

39.

Figure 5 illustrates the fact that the limit frequency, fg equations and impedance diagrams for long solid rods and long thin-walled tubing are:
Figure-5.png

 
 
 
 

40.

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

 
 
 
 

41.

A term used to define a system that 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:

 
 
 
 

42.

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

 
 
 
 

43.

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

 
 
 
 

44.

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

 
 
 
 

45.

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

 
 
 
 

46.

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

 
 
 
 

47.

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

 
 
 
 

48.

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

 
 
 
 

49.

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

 
 
 
 

50.

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

 
 
 
 

51.

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

 
 
 
 

52.

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

The-formula-used-to-calculate-the-impedance-of-an-eddy-current-test-coil-is.png

 
 
 
 

53.

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

 
 
 
 

54.

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

 
 
 
 

55.

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

 
 
 
 

56.

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

 
 
 
 

57.

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

 
 
 
 

58.

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

 
 
 
 

59.

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:

 
 
 
 

60.

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

 
 
 
 

61.

When eddy current testing by the linear time-based 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?

 
 
 
 

62.

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

 
 
 
 

63.

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

 
 
 
 

64.

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

 
 
 
 

65.

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

 
 
 
 

66.

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

 
 
 
 

67.

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

 
 
 
 

68.

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:

 
 
 
 

69.

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

 
 
 
 

70.

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

 
 
 
 

71.

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

 
 
 
 

72.

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?

 
 
 
 

73.

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

 
 
 
 

74.

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

 
 
 
 

75.

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:

 
 
 
 

76.

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

 
 
 
 

77.

The symbol commonly used to signify impedance is:

 
 
 
 

78.

A decrease in conductivity is equivalent to:

 
 
 
 

79.

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

 
 
 
 

80.

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:

 
 
 
 

81.

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

 
 
 
 

82.

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

 
 
 
 

83.

The two voltages (V1 and V2) shown in Figure 6 are:
Figure-6.png

 
 
 
 

84.

The two voltages (V1 and V2) in Figure 7 are:
Figure-7.png

 
 
 
 

85.

In Figure 8, H represents:
Figure-8.png

 
 
 
 

86.

In Figure 8, B represents:
Figure-8.png

 
 
 
 

87.

In Figure 8, the distance represented by A is a measure of the materials:
Figure-8.png

 
 
 
 

88.

In Figure 8, the distance represented by C is a measure of the materials:

Figure-8.png

 
 
 
 

89.

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

 
 
 
 

90.

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

 
 
 
 

91.

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

 
 
 
 

92.

For age hard enable aluminum and titanium alloys, changes in hardness are indicated by changes in the:

 
 
 
 

93.

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

 
 
 
 

94.

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

 
 
 
 

95.

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

 
 
 
 

96.

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 the frequency ratio f/fg lies at the same point on the impedance diagram for each specimen. This principle is based upon:

 
 
 
 

97.

To be useful, limit frequency equations must be:

 
 
 
 

98.

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

 
 
 
 

99.

The term fill factor applies to:

 
 
 
 

100.

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

 
 
 
 

101.

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

 
 
 
 

102.

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

 
 
 
 

103.

The actual frequencies used in any specific eddy current inspection should be selected on the basis of the:

 
 
 
 
 

104.

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

 
 
 
 

Question 1 of 104

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