Theory and application of non destructive testing method eddy current
Include a high pass filter in the eddy current test equipment
Include a low pass filter in the eddy current test equipment
Increase the band pass of the amplifier
Use the impedance method of testing
Filtering or differentiation
Phase discrimination
Intergration
All 3 are correct
The test frequency should be increased
The test frequency should be decreased
The fill factor should be decreased
There is no practical method for decreasing this effect
Coplanar with the major plane of the discontinuity
Perpendicular to the major plane of the discontinuity
Parallel to the major plane of the discontinuity
90 degress out of the phase with current in the coil
Fill factor
Edge effect
End effect
Lift off
Skin effect
High frequency filtration
Low frequency filtration
Any of these answers
0.5 (50%)
0.75 (75%)
1.0 (100%)
0.25 (25%)
Phase shift
Nonlinearity
Lift off
Skin effect
Low pass filter
Oscillator
Phase discriminator
High pass filter
Capacitive reactance and resistance
Harmonic frequencies and inductive reactance
Signal ampllitude and phase
Retentivity harmonic frequencies
Xr = 2 pie L
Xr = 1/2 pie L
Xr = 2 pie fL
Xr = 1R
Test speed
Impedance of the pickup coil
None of the 2 answers
Both answers are correct
Differential
Absolute
Laminar
Flying probes
U-Shaped coils
Gap coils
Encircling coils
None of the answers
Length of the test sample
Thickness of the test sample
Cross-sectional area of the test sample
AllÂ answers are correct
Test material permeability
Test frequency
Geometry of the test object
All answers are correct
Magnetostriction
Electromagnetic induction
Piezoelectric energy conversion
Magnetomotive force
Coercive force
Residual Magnetism
Saturation value
Hysteresis loss
Coercive force
Magnetizing force
Back emf
The overlap value
Electrical conductivity, frequency, and material geometry
Density, permeability, and frequency
Electrical conductivity, permeability, and material geometry
Thermal conductivity, electrical conductivity, and permeability
Double the inductance
Halve the inductance
Decrease the inductance by a factor of 4
Increase the inductance by a factor of 4
The argument of the mathematical function describing the electromagnetic field within the test specimen
Test frequency divided by limit frequency
Neither
Both
The signals are in phase
The phase of the OD discontinuity leads the phase of the ID discontinuity
The phase of the OD discontinuity lags the phase of the ID discontinuity
Indeterminate
Phase distortion
Phase shifting
Phase discrimination
Phase analysis
1.25 Hz
12.5 Hz
1.25 kHz
12.5 kHz