Question

From the numbered list below, decide which of the items are representative of each of parts (a), (b), (c), and (d).

(a)Advantages of cold working.
(b)Advantages of hot working.
(c)Disadvantages of cold working.
(d)Disadvantages of hot working.

(1) A high quality surface finish
(2) Large deformation are possible, which may be repeated
(3) The mechanical properties may be varied
(4) Close dimentional tolerances
(5) Deformation energy requirements are relatively low
(6) A poor surface finish
(7) A loss of ductility
(8) Large deformations must be accomplished in steps, which may be expensive
(9) High deformation energy requirements
(10) A variety of mechanical properties is not possible

a. (a) - 2,5 (b) - 1,3,4 (c) - 6,8,9 (d) - 7,10
b. (a) - 4,5 (b) - 1,2,3 (c) - 6,9 (d) - 7,8,10
c. (a) - 2,3 (b) - 1,4,5 (c) - 6,7,10 (d) - 8,9
d. (a) - 1,3,4 (b) - 2,5 (c) - 7,8,9 (d) - 6,10
e. (a) - 1,2,5 (b) - 3,4 (c) - 6,10 (d) - 7,8,9

Answer 1

The items corresponding to the advantages and disadvantages of cold working and hot working metal are: (a) 1, 4 for cold working advantages; (b) 2, 5 for hot working advantages; (c) 6, 7, 9 for cold working disadvantages; and (d) 8, 10 for hot working disadvantages.

Step-by-step explanation:

The question is asking to match the items from a numbered list to the categories describing advantages and disadvantages of cold working and hot working metal. Based on the properties associated with each process:

• Advantages of cold working typically include improved strength due to work hardening and better surface finish, which is item (1) A high quality surface finish, and item (4) Close dimensional tolerances.
• Advantages of hot working involve the ability to shape metal more extensively without failure and reduced energy requirements, which corresponds to items (2) Large deformations are possible, which may be repeated, and (5) Deformation energy requirements are relatively low.
• Disadvantages of cold working involve increased energy requirements and potential for defects due to strain hardening, corresponding to item (6) A poor surface finish, item (7) A loss of ductility, and item (9) High deformation energy requirements.
• Finally, disadvantages of hot working include a loss of precision and the inability to achieve certain mechanical properties, which are item (8) Large deformations must be accomplished in steps, which may be expensive, and item (10) A variety of mechanical properties is not possible.

Thus, the correct answer corresponds to:

• (a) - Advantages of cold working: items 1, 4
• (b) - Advantages of hot working: items 2, 5
• (c) - Disadvantages of cold working: items 6, 7, 9
• (d) - Disadvantages of hot working: items 8, 10

Answer 2

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