awnser all a-d for each T/F all can be true all can be false or half/half go thr

Question

awnser all a-d for each T/F all can be true all can be false or half/half go through each one please and thank you!

26. magnetic materials are characterized Hard a A high coercivity by b A d A near relation field strength and flux d They become between they are magneti 27. Eddy currents are by the follo ng material a The permeabi modified b The conductivity of the materia properties. of the material d The shape of the object. 28. To detect a crack with an eddy current system, it is required... a To magnetize the material. b To a probe surface. c To apply coupling medium. d To use a DC current through the eddy current probe. 29. Which of the following materials and parameters lead the highest eddy current to penetration depth? a A silicon nitride (ceramic) and high test frequency (10Mllz). b An iron and high test frequency (1MHz). c An aluminum and a low test frequency (500Hz). d An aluminum with a high test frequency(500kHz). 30. Eddy current testing can be used to... a. Measure the thickness of non-conducting layers on top of conducting materials L b. Detect internal cracks with a high distance to the inspection surface. c. To detect surface breaking cracks. that vary in conductivity and d. To identify materials or to sort materials permeability.

Explanation / Answer

A true

Reason

Coercivity is a measure of the how a ferromagnetic material is able to withstand external magnetic field without being demagnetized

B false reason same as above

C. False.

Reason B=meu * H

B is related to properties of material and cannot be equal to H

D. False it is not dependent on that when a material is magnetized its grains align in the direction of magnetic field.

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