Electromagnetic Testing - ECT Q&A
Electromagnetic Testing - ECT Q&A
Electromagnetic Testing - ECT Q&A
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Q9. To obtain the maximum signal (using a surface probe) from a defect of a<br />
given size at a given depth in a flat conductor there is:<br />
a) an optimum size coil, but no optimum frequency.<br />
b) an optimum frequency, but no optimum size coil.<br />
c) an optimum frequency and optimum size probe.<br />
d) no absolute optimum, but use the highest frequency and the smallest coil<br />
attainable.<br />
Q10. Conductivity instruments can be used to sort materials with different:<br />
a) electrical conductivity.<br />
b) electrical resistivity.<br />
c) magnetic permeability.<br />
d) all of the above.<br />
Charlie Chong/ Fion Zhang
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