Eddy Current- UR

Question 1

Which component of an eddy current inspection system induces eddy current into the part being tested?

Answer 1

coil assembly

Question 2

What effect does a strong secondary magnetic field opposing the primary magnetic field have on depth of penetration in a material with high permeability?

Answer 2

reduced depth of penetration

Question 3

when all other factors remain constant, what will a higher eddy current inspection frequency result in?

Answer 3

increased surface sensitivity and decreased depth of penetration

Question 4

Usually, eddy currents are not useful as an inspection tool below….

Answer 4

3 standard depth of penetration

Question 5

What is the minimum desired eddy current signal-to-noise ratio?

Answer 5

three to one

Question 6

What do you call the adjustments you make to minimize the effect of eddy current probe proximity to the surface?

Answer 6

liftoff

Question 7

When two elements of alternating current (AC) reach maximum, minimum, and zero points at different times, they are said to be?

Answer 7

out-of- phase

Question 8

A plot of resistance and inductive reactance on a X-Y graph is called?

Answer 8

an impedance plane diagram

Question 9

What control would you sue to change the display appearance or numerical parameters for a selected function on the Nortec 2000?

Answer 9

smartknob

Question 10

how many test setups can be storeed in the Nortec 2000?

Answer 10

100

Question 11

In simplest basic eddy current instrument, analysis of the signal consist of measuring the change in relative magnitude of the current flowing through the?

Answer 11

bridge circuit

Question 12

What affects sensitivity and requires lift-off compensation during eddy current instrument standardization?

Answer 12

Paint thickness

Question 13

you are using an eddy current probe to scan a part, the best way to reduce your chance of missing small cracks is to move the probe?

Answer 13

perpendicular to the direction of expected defects

Question 14

Which material should not be used to make an eddy current probe fixture?

Answer 14

Steel

Question 15

What must be done to the part before calibrating the eddy current instrument on the standard?

Answer 15

visually inspect for painted surface

Question 16

What must you determine from the inspection procedure before selecting the correct standard to use?

Answer 16

whether the part is made of aluminum or steel

Question 17

conductivity measurement is based on the?

Answer 17

International Annealled Copper Standard (IACS) system

Question 18

Which is a typical application using conductivity measurement?

Answer 18

inspecting for changes in metal property

Question 19

In degrees Fahrenheit, what is the worldwide standard temperature used to measure the conductivity of a standard?

Answer 19

68

Question 20

When performing absolute conductivity with the Nortec 2000, what should you do after connecting the probe and turning the instrument on?

Answer 20

begin calibration by pressing the main function key

Question 21

What must be done prior to calibrating an eddy current instrument for conductivity measurements?

Answer 21

allow the standards to reach the same temperature as the item under test