EMC EXAM QUESTIONS AND ANSWERS

1. What can cause stress risers? a. punch marks b. corrosion grooves c. corrosion pits d. all of the above - Answer- D 2. When a metal (or alloy) cools from a liquid to a solid state, the lack of molten metal to feed the shrinkage will lead to: a. pipes, voids and cavities b. sponge like appearance and hot tears c. none of the above d. both a and b - Answer- D 2. Which of the following is not a cause of undercutting? a. excessive amperage b. excessive travel speed c. excessive electrode diameter d. excessive restraint during welding - Answer- D 2. An extremely thin discontinuity that is the result of pipes or inclusions flattened and made directional by working is called: a. a stringer b. a lamination c. a seam d. a cold shut - Answer- B 2. In general, where can you find heat treatment cracks? a. at the center of a weld b. in areas of sudden change in thickness c. on a cast plate d. all of the above - Answer- B 2. Which of the following measurements indicates the smoothest surface finish? a. 250 micro inches b. 0.0002 inch c. 0.00015 inch d. 100 micro inches - Answer- D