1.
A method of minimizing the effect of indications caused by gradual dimensional changes whileretaining the indications caused by discontinuities is to:
A. 
Include a high pass filter in the eddy current test equipment
B. 
Include a low pass filter in the eddy current test equipment
C. 
Increase the band pass of the amplifier
D. 
Use the impedance method of testing
2.
Which of the following methods may be used to improve the signal-to-noise ratio of an eddycurrent test system?
A. 
Filtering or differentiation
B. 
C. 
D. 
3.
In order to decrease the effect on conductivity readings due to variations in test part thickness:
A. 
The test frequency should be increased
B. 
The test frequency should be decreased
C. 
The fill factor should be decreased
D. 
There is no practical method for decreasing this effect
4.
When testing by the eddy current method, discontinuities will be most easily detected when the eddy currents are:
A. 
Coplanar with the major plane of the discontinuity
B. 
Perpendicular to the major plane of the discontinuity
C. 
Parallel to the major plane of the discontinuity
D. 
90 degress out of the phase with current in the coil
5.
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. 
B. 
C. 
D. 
6.
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:
A. 
B. 
High frequency filtration
C. 
D. 
7.
The fill factor when a 1/2 inch diameter bar is inserted in a 1 inch diameter coil is:
A. 
B. 
C. 
D. 
8.
The term used to define the difference between actual instrument output and expectedoutput as defined by a straight line calibration curve is:
A. 
B. 
C. 
D. 
9.
Which of the following could be used to suppress unwanted high frequency harmonics?
A. 
B. 
C. 
D. 
10.
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:
A. 
Capacitive reactance and resistance
B. 
Harmonic frequencies and inductive reactance
C. 
Signal ampllitude and phase
D. 
Retentivity harmonic frequencies
11.
The inductive reactance of a test coil can be calculated using the formula:
A. 
B. 
C. 
D. 
12.
When conducting an eddy current test, variations in the test material can be detectedas variations in:
A. 
B. 
Impedance of the pickup coil
C. 
D. 
13.
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:
A. 
B. 
C. 
D. 
14.
Tubing is generally inspected using:
A. 
B. 
C. 
D. 
15.
When testing small parts in an eddy current encircling coil for permeability measurements,which of the following test parameters may be considered important?
A. 
Length of the test sample
B. 
Thickness of the test sample
C. 
Cross-sectional area of the test sample
D. 
16.
In a test coil consisting of both a primary and secondary winding, the voltage across thesecondary is a function of:
A. 
Test material permeability
B. 
C. 
Geometry of the test object
D. 
17.
Eddy current testing relies on the principle of:
A. 
B. 
Electromagnetic induction
C. 
Piezoelectric energy conversion
D. 
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 to define this Bvalue when H has returned to zero is:
A. 
B. 
C. 
D. 
19.
The term used to define the value of H field required to decrease the remanence of a material to zero is:
A. 
B. 
C. 
D. 
20.
The 3 major specimen parameters which influence eddy current testing are:
A. 
Electrical conductivity, frequency, and material geometry
B. 
Density, permeability, and frequency
C. 
Electrical conductivity, permeability, and material geometry
D. 
Thermal conductivity, electrical conductivity, and permeability
21.
Doubling the number of turns on a coil will:
A. 
B. 
C. 
Decrease the inductance by a factor of 4
D. 
Increase the inductance by a factor of 4
22.
Frequency ratio f/f can be defined as:
A. 
The argument of the mathematical function describing the electromagnetic field within the test specimen
B. 
Test frequency divided by limit frequency
C. 
D. 
23.
When testing tubing, using an encircling (OD) coil, What is the phase relationship of the output signals from identical ID and OD discontinuities?
A. 
B. 
The phase of the OD discontinuity leads the phase of the ID discontinuity
C. 
The phase of the OD discontinuity lags the phase of the ID discontinuity
D. 
24.
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:
A. 
B. 
C. 
D. 
25.
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:
A. 
B. 
C. 
D.