ENTC 402 Magnetic questions with verified solution 2023

ENTC 402 MagneticMagnetic particle is a nondestructive testing method used for - correct answer locating surface and near surface discontinuities in steel Ferromagnetic material is - correct answer strongly attracted by a magnet The permeability of a material describes: - correct answer the ease with which it can be magnetized The retentivity of a material describes - correct answer the ability to retain the magnetic field Magnetic particles are available in different colors - correct answer for color contrast with the part surface thereby enhancing detection of indications. Which of the following can be magnetized - correct answer iron The magnetic field is strongest when - correct answer the magnetizing current is flowing If a crack exists in a circular magnet, the attraction of magnetic particles to the crack is caused by: - correct answer a leakage field The unit usually used to denote flux density is - correct answer gauss. Which statement is true when related to magnetic lines of force? - correct answer They are most dense at the poles of a magnet Magnetic flux lines that are parallel to a discontinuity produce - correct answer no indications A part is adaptable to magnetic particle inspection if: - correct answer the material is ferromagnetic. What rule describes the direction of current flow (+ to -) when lines of magnetic force surround a conductor? - correct answer right-hand rule The magnitude of the residual magnetic field in a specimen is dependent on: - correct answer the strength of the applied magnetizing force. The proper number of ampere-turns for a given test specimen being examined by longitudinal magnetism is determined by: - correct answer its length and diameter A circular field may be induced into a specimen by - correct answer passing current directly through the part An electrical yoke produces - correct answer a longitudinal field An energized coil around the part produces: - correct answer a longitudinal field In longitudinal magnetization the proper term for calculating magnetizing force is - correct answer ampere turns Magnetic lines of force: - correct answer form a closed loop A magnetic particle buildup from a discontinuity is strongest when the discontinuity is oriented - correct answer 90 degrees to the magnetic flux flow A specimen may be demagnetized by which of the following methods? - correct answer Placing the part in reversing and decreasing direct current fields. Which of the following is an advantage of magnetic particle testing over penetrant testing? - correct answer It can detect near-surface discontinuities.