Now that you have the parts thoroughly cleaned, you will complete a visual inspection for cracks. Which crack detection method will help you find a crack in an
aluminum part?
Fluorescent-penetrant testing
Pressure testing
Dye-penetrant testing
Magnetic crack detection

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.