Answer Happy

Instructions: Please answer the following questions by checking the boxes. Generally, you will have four possible answers. It is possible that more than one answer is correct, even though it may be correct to check all four "Yes" boxes. On the other hand, it may be possible that none of the answers is correct. This means that you may have to check all "No" boxes. 5. What are reasons for employing gamma sources instead of X-ray tubes for radiographic inspections? Please give a very detail explanation below! 4P Yes No a. They require less radiation protection. b. The image quality is better. c. They don't need power supply and are portable. d. They can have higher photon energies than X-ray tubes. Yes No 6. What type of radiation is required for X-ray diffraction? Please give a very detail explanation below! 4P a. The whole spectrum of an X-rays source with Molybdenum target. b. Characteristics radiation, for example Cu and Ka. c. Monochromatic X-rays. d. Gamma radiation. 7. A magnetic field is generated... Please give a very detail explanation below! 4P a. by a lightning strike. b. by a current through a coil. c. by a full charged capacitor. d. by an eddy current. 8. Magnetic particle techniques: Please give a very detail explanation below! 4P a. Can detect inner defects (porosity) in large steel casting objects. b. Are for instance used for surface and surface near defects in mild steel. c. Are very efficient for Al and Ti alloys. d. Can detect defects under coatings. ■ ■ Yes No Yes No ☐☐
9. Hard-Magnetic materials are characterized by... Please give a very detail explanation below! 4P Yes No a. A high coercive field strength. b. Have a low remanent magnetization. c. A linear relation between field strength and flux density. d. They become harder if they are magnetized. 10. For which of the following magnetic properties of materials the permeability is less than one or the susceptibility is less than zero? Please give a very detail explanation below! 4P Yes No a. Diamagnetism b. Paramagnetism. c. Ferromagnetism. d. Flux density 11. The magnetic permeability... Please give a very detail explanation below! 4P Yes No a. Describes a materials property. b. Can be calculated by flux density "B" divided by magnetic field strength "H".[ c. Exists only for ferromagnetic materials. d. Describes the electric polarization. 12. Eddy currents are modified by... Please give a very detail explanation below! 4P Yes No a. The permeability of the material. b. The conductivity of the material. c. The optical reflectivity. d. The shape of the object (topography, cracks, and ...).
13. Which of the following materials and parameters lead to the highest eddy current penetration depth? Please give a very detail explanation below! 6P Yes No a. Silicon nitride (ceramic) and high-test frequency (10MHz). b. Iron and high-test frequency (IMHZ). c. Aluminum and a low-test frequency (50Hz). d. Aluminum with a high-test frequency (5MHz). 14. Which of the following techniques can be used to detect internal defects of size 200 um or less in the full volume 1 cubic centimeter aluminum block? Please give a very detail explanation below! 6P Yes No a. Micro-focus X-ray Technique. b. Liquid Penetrant Testing (LPT). c. Optical Microscopy. d. Acoustic Microscopy.