Hard magnetic materials are characterized by... a. A high coercivity. b. A low c

Question

Hard magnetic materials are characterized by... a. A high coercivity. b. A low coercivity. c. A linear relation between field strength and flux density. d. They become harder if they are magnetized. Eddy currents are modified by the following material properties... a. The permeability of the material. b. The conductivity of the material. c. The optical reflectivity. d. The shape of the object. To detect a crack with an eddy current system, it is required... a. To magnetize the material. b. To scan a probe across the surface. c. To apply coupling medium. d. To use a DC current through the eddy current probe. Which of the following materials and parameters lead to the highest eddy current penetration depth? a. A silicon nitride (ceramic) and high test frequency (10MHz). 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). Eddy current testing can be used to... a. Measure the thickness of non-conducting layers on top of conducting materials b. Detect internal cracks with a high distance to the inspection surface. c. To detect surface breaking cracks. d. To identify materials or to sort materials that vary in conductivity and permeability.

Explanation / Answer

high magnetic material are characterized by high coercivity

eddy currents are modified by the following material properties   :    a    and b

to detect a crack with eddy current system, it is required to scan the probe across the surface

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