EDDY CURRENT 2 QUIZ 10 WITH COMPLETE SOLUTIONS

EDDY CURRENT 2 QUIZ 10 WITH
COMPLETE SOLUTIONS

Which of the following statements is incorrect? - ANS ✔✔A. the unit of measurement of
alternating current frequency is hertz.

B. alternating current frequency is defined as cycles per minute.

C. the frequency of a sine wave having 5000 cycles per second is 5 kHz.

D. the depth of eddy current penetration changes with applied frequency.



Medium frequency is used for which measurement? - ANS ✔✔A. permeability measurement.

B. impedance charge.

C. conductivity measurement.

D. material testing.



Which is the most important parameter that affects the depth of penetration? - ANS ✔✔A. the
test frequency.

B. the coil fill factor.

C. an alternating current source supplying power.

D. the signal generator unit.



Which of the following is true regarding the distribution of eddy currents throughout the test
object? - ANS ✔✔A. eddy currents are uniformly distributed throughout the test object.

B. eddy currents are most dense at the surface closest to the coil.

C. eddy currents are concentrated at the mid-section of the test object.

D. for hybrid coils, the distribution of eddy currents through the test object is uniform.