Question

1. According to the book 'Product Design for Manufacture and Assembly', over what % percentage of the final product costs are typically determined during design phase? [2 marks]

   A. 40% B. 50% C. 60% D. 70% E. 80%

2. What % percentage of carbon is used in AISI 1020 steel?

   1. 0.1020%

   2. 0.2%

   3. 2.0%

   4. 20%

   5. 10.2%

   6. None of the above

3. Which one of the following methods does NOT strengthen a single-phase metal?

   1. precipitation hardening

   2. strain hardening

   3. annealing (recovery, recrystallization, grain growth)

   4. grain size reduction

   5. solid-solution alloying

4. Which one of the following statements about the process of annealing metal is false or incorrect?

   1. removes residual stresses

   2. decreases the density of dislocations

   3. reduces toughness by lowering ductility

   4. lowers the grain boundary area (by creating coarser grains)

5. What does the term “microstructure” refer to in the field of materials engineering? Choose the bestanswer.

   1. The size and shapes of the grains in the solid where each grain is like a ball or clump or collection of organized atoms (organized as a crystal or 3D matrix of atoms).

   2. The relative positions of atoms in a grain.

   3. The type of crystal structure (e.g. BCC, FCC, HCP, or amorphous).

   4. The material as seen through a microscope.

   5. None of these answers.

6. For a metal like iron, why does strength decrease and ductility increase when temperature is increased to above its recrystallization temperature? Choose the best answer.

   1. The BCC crystals convert to FCC crystals which are more flexible and ductile.

   2. New crystals grow out of the old grain structures, and as grains grow larger, grain boundary area increases and larger grains can slide past each other more easily and with less force

      than for smaller grains.

   3. As temperature increases, the atoms gain enough energy to reorganize themselves, form

      new bonds, and relieve internal stresses to allow dislocations to move more easily with less

      force.

   4. As temperature increases, the metal gradually transforms from a strong solid to a weak

      liquid, and gets weaker during this process.

7. On which type of plane will slip first occur in the BCC (Body Centered Cubic) crystal structure?

   1. (100)

   2. (101)

   3. (111)

   4. (110)

   5. None of these answers

8. What is the densest plane in the FCC (Face Centered Cubic) crystal structure?

   A. (100)
   B. (101)
   C. (111)
   D. (110)
   E. None of these answers

9. Which one of the following types of fits is the most economical or easiest for achieving the tolerances for two mating parts that must move relative to each other?

   1. Loose Running fit

   2. Free Running fit

   3. Close Running fit

   4. Sliding fit

   5. Location fit or Locational Clearance fit

   6. Transition fit

   7. Interference fit

10. Which one of the following types of fits is best for achieving a strong permanent or semi-permanent connection between two mating parts that are not designed to move relative to each other?

    1. Loose Running fit

    2. Free Running fit

    3. Close Running fit

    4. Sliding fit

    5. Location fit or Locational Clearance fit

    6. Transition fit

    7. Interference fit

Answer 1

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Soh:- dit "Product degign for manufacture and assembly = "70%" of cost ase dereymoned during design phase. Ans - D"70%" al erot 9.2 AISI 20 20 steel contains 012 4. Carbon Ans 440.2%3 Ang :- " Percipation hasdening' - Used for alloys. cara US ON euert ans. Reduce toughness by lower ing dịchility) Es false Because in annealing ductility & toughness increases.

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