Which of the following test frequencies would generally provide the best penetration in a 12 inch thick specimen of coarse-grained steel?

Related MCQs

• A 7.6 cm (3 inches) thick test specimen is radiographed with a source having size of 1.3 cm (1/2 inch), the film is placed in contact with the test specimen. The source to film distance is 40.6 cm (16 inches).The geometric unsharpness obtained is:
• The approximate radiographic equivalence factors for steel and copper at 220 kV are 1.0 and 1.4 respectively. If it is desirable to radiograph a 1.27 cm (0.5 inch) piece of copper, what thickness of steel would require about the same exposure characteristics?
• When using a straight beam technique to examine a thick test piece what change(s) would you expect to see in back wall echo size as you approach the side of the test piece? (Transducer remains completely on test piece)
• Radiographic equivalence factors for Inconel and 304 stainless steel are 1.4 and 1.0 respectively. What is the approximate equivalent thickness of Inconel requiring the same exposure as 1.27 cm (½ inch) thickness of 304 stainless steel?
• If it were necessary to radiograph 18 cm (7 in.) thick steel product, which of the following gamma ray sources would most be used?
• Under most circumstances, which of the following frequencies would result in the best resolving power?
• Which type of gamma ray source would be used to radiograph a weld in 150 mm thick steel plate?
• Which of the following frequencies would probably result in the greatest ultrasonic attenuation losses?
• Typical immersion test frequencies for wrought aluminium are:
• For adequate test results, the black light used in fluorescent penetrant examination should provide what minimum black light intensity at the test surface?