cap 7 Materiales

Question 1

1. Although there are higher costs associated with
   any deformation process like hot or cold working, 80% of iron-based materials are finish processed as:
   a. cast materials.
   b. wrought materials.
   c. welded materials.
   d. forged materials.

Answer 1

b. wrought materials.

Question 2

2. Mill products (such as bar stock, plate, and structural shapes) typically represent only a(n)_______stage of manufacture with no specific product in mind.
   a. intermediate
   b. final
   c. postproduction
   d. end user

Answer 2

a. intermediate

Question 3

3. A forming operation that exhibits three-dimensional control over the final shape of a product is called:
   a. pressing.
   b. cold working.
   c. forging.
   d. hot working.

Answer 3

c. forging.

Question 4

4. There are two basic types of forging operations.
   The operation that requires the material to be fully confined, at least at the completion of the operation, is known as:
   a. open die forging.
   b. closed impression die forging.
   c. case drop forging.
   d. drop case forging.

Answer 4

b. closed impression die forging

Question 5

5. When inspecting forgings for discontinuities that are open to the surface, but tightly closed, on a part made from ferrous material, which of the following methods would be the most efficient?
   a. Radiographic testing.
   b. Ultrasonic testing.
   c. Visual testing.
   d. Magnetic particle testing.

Answer 5

d. Magnetic particle testing.

Question 6

6. For most forgings, some pre-shaping operations are used to ensure that approximately the right quantity of metal is already at the proper place in the dies before they are closed. These pre-shaping operations include all but which of the following?
   a. Upsetting.
   b. Drawing.
   c. Cleaving.
   d. Fullering.

Answer 6

c. Cleaving.

Question 7

7. Enlarging the cross section of a forging by pressure from the end describes:

a. upsetting.
b. drawing.
c. edging.
d. fullering.

Answer 7

a. upsetting.

Question 8

8. Reducing the cross section of forging stock throughout describes:

a. upsetting.
b. drawing.
c. edging.
d. fullering

Answer 8

b. drawing.

Question 9

9. Reducing the cross section of forging stock between the ends describes:

a. upsetting.
b. drawing.
c. edging.
d. fullering.

Answer 9

d. fullering.

Question 10

10. Distributing the metal of forging stock to the
    general contour of the finished stock describes:
    a. upsetting.
    b. drawing.
    c. edging.
    d. blocking.

Answer 10

c. edging.

Question 11

11. Shaping forging stock to rough-finished form without detail describes:
    a. upsetting .
    b. drawing.
    c. edging.
    d. blocking.

Answer 11

d. blocking.

Question 12

12. Bolts, rivets, nails, small gear blanks, and great numbers of small automotive fittings are forged by which of the following processes?

a. Hammer forging.
b. Roll forging.
c. Machine forging.
d. Press forging.

Answer 12

c. Machine forging.

Question 13

13. When an ingot is first cast, a portion of the top mar be cropped or cut away from the bloom to eliminate a major portion of the impurities, shrink, and poor quality metal originating in the ingot. How much might be cropped or cut away?

a. As much as one-eighth.
b. As much as one-quarter.
c. As much as one-third.
d. As much as one-half.

Answer 13

c. As much as one-third.

Question 14

14. Billets are smaller than blooms, Blooms are frequently reduced to billet size, which have a maximum cross section of:
    a. 154 cm2(24 in.2 )
    b. 232 cm2(36 in.2)
    c. 309 cm2(48 in.2)
    d. 387 cm2(60 in.2)

Answer 14

b. 232 cm2(36 in.2)

Question 15

15. Products produced by a steel mill that include
    strip, sheet, or plate, are classified generically as:
    a. final products.
    b. rolled products.
    c. flat products.
    d. rectangular products.

Answer 15

c. flat products.

Question 16

16. Most pipe manufactured by the welding process
    is made of what material?
    a. Copper.
    b. Stainless steel.
    c. Aluminum.
    d. Steel.

Answer 16

d. Steel.

Question 17

17. The term for the wrought iron or steel that has been rolled or forged into narrow strips for pipe or tubing manufacture by drawing is known as:

a. strip.
b. plate.
c. skelp.
d. kerf.

Answer 17

c. skelp.

Question 18

18. Light-gage pipe or tubing that is manufactured using a continuous spiral butt or lap joint is normally accomplished by which welding process?

a. Submerged arc.
b. Gas metal arc.
c. Gas tungsten arc.
d. Resistance.

Answer 18

d. Resistance.

Question 19

19. The most common method of manufacturing seamless steel pipe and tubing is by which initial process?
    a. Piercing.
    b. Resistance welding.
    c. Forging.
    d. Extrusión.

Answer 19

a. Piercing.

Question 20

20. The production of seamless tubing can cause tears and other crack-like discontinuities and irregularities in sizing and wall thickness.
    Several hundred meters or feet per minute can be examined by which of the following NDT methods?

a. Ultrasonic testing.
b. Electromagnetic testing.
c. Radiographic testing.
d. Visual testing.

Answer 20

b. Electromagnetic testing.

Question 21

21. The extrusion process is used almost exclusively for which type of material?

a. Stainless.
b. Ferrous.
c. Nonferrous.
d. Anisotropic.

Answer 21

c. Nonferrous.

Question 22

22. The principal shape limitations of the extrusion process are generally concerned with:

a. length of the product.
b. diameter of the product.
c. cross-sectional thickness.
d. taper of the product.

Answer 22

c. cross-sectional thickness.

Question 23

23. Cylindrically drawn shapes can be manufactured by shell drawing and which of the following methods?

a. Rotary swaging.
b. Stretch forming.
c. Spinning.
d. Punch forming.

Answer 23

c. Spinning.

Question 24

24. Rotary swaging is most frequently used for reducing the ends of bar, tube, or wire stock so that it may be started through a die for a drawing operation. Rotary swaging can also be used for the:
    a. expanding of tube or stock.
    b. closing or necking of cylinders.
    c. pinch shearing of rotating stock.
    d. spindle shearing of rotating stock

Answer 24

b. closing or necking of cylinders.

Question 25

25. When looking at a typical punch and die setup. the die is normally which half of the tooling? a. Active. b. Upper. c. Middle. d. Lower.

Answer 25

d. Lower.

Question 26

26. There are three categories of shearing operations. Slitting, parting and dinking are all: a. finishing operations. b. hole-making operations. c. stock preparation operations. d. slip plane operations.

Answer 26

c. stock preparation operations.

Question 27

27. There are three categories of shearing operations. Perforating, notching, and lancing are all: a. finishing operations. b. hole-making operations. c. stock preparation operations. d. slip plane operations.

Answer 27

b. hole-making operations.

Question 28

28. There are three categories of shearing operations. Trimming and shaving are both: a. finishing operations. b. hole-making operations. c. stock preparation operations. d. slip plane operations.

Answer 28

a. finishing operations.

Question 29

29. Reducing large sheet or coil stock to a smaller size for handling purposes or to produce parts with finished or semi-finished shapes is normally done using which of the following? a. Press brake. b. Squaring shear. c. Finger brake. d. Beading machine.

Answer 29

b. Squaring shear.

Question 30

30. When bending material with any cross section, regardless of how the operation is performed, the stress on the inside of the bend will be: a. tensile. b. compressive. c. shearing. d. dislocation.

Answer 30

b. compressive.

Question 31

31. When bending material with any cross section, regardless of how the operation is performed, the stress on the outside of the bend will be: a. tensile. b. compressive. c. shearing. d. dislocation.

Answer 31

a. tensile.

Question 32

32. The most highly developed form of "high energy rate forming" is: a. hydraulic presses. b. vacuum presses. c. explosive forming. d. electromagnetic forming.

Answer 32

c. explosive forming.

Question 33

33. Often, this metal working technique is used in combination with pressure and heat to produce chemical catalysts, filtering elements, and bearings. a. Explosión forming. b. Powder metallurgy. c. Gas expansion forming. d. Inductive-repulsive forming.

Answer 33

b. Powder metallurgy.

Question 34

34. Hot pressing and cold pressing are the two most common________procedures. a. molding b. forging c. sintering d. forming

Answer 34

c. sintering

Question 35

35. In its broadest sense, the process of _______is the mechanism by which solid particles are bonded by the application of pressure or heat or both and includes welding, brazing, soldering, and the firing of ceramics. a. forging. b. sintering. c. molding. d. forming.

Answer 35

b. sintering.

Question 36

36. When measuring sheet metal product thickness and only one side of the product is accessible, both the ultrasonic and______ methods will provide highly accurate readings. a. radiographic testing b. infrared and thermal testing c. electromagnetic testing d. acoustic emission testing

Answer 36

c. electromagnetic testing