Metallurgy

Question 1

During the iron ore refining process, the main function of limestone is to?

a) increase steel hardness
b) reduce cast iron cracking
c) provide the heat required to melt the iron within the iron ore
d) combine with impurities in the molten metal and form slag

Answer 1

d) combine with impurities in the molten metal and form slag

Question 2

a heat of steel when poured into a mold is commonly referred to as an?

a) bar
b) ingot
c) brick
d) billet

Answer 2

b) ingot

Question 3

Of these elements common to cast iron and steel, the one that most affects hardness and strength is?

a) phosphorous
b) carbon
c) nickel
d) molybdenum

Answer 3

b) carbon

Question 4

The percentage of the element carbon together with iron will determine?

a) the hardness of steel
b) whether the outcome product is cast iron or cast steel
c) the alloy content of the outcome prodcut
d) both A & C

Answer 4

whether the outcome product is cast iron or cast steel

Question 5

Carbon levels for cast iron are typically?

a) 0.02-0.25%
b )0.25-.050%
c) 0.5-2.00%
d) 2.00-4.00%

Answer 5

d) 2.00-4.00%

Question 6

Carbon levels for medium carbon steel are typically?

a) 0.02- 0.25%
b) 0.25-0.50%
c) 0.50-2.00%
d) 2.00-4.00%

Answer 6

b) 0.25-0.50%

Question 7

Alloy agents are mixed with steels to?

a) reduce steel costs
b) improve the steel physical properties
c) provide case hardening
d) reduce inclusion quantities

Answer 7

b) improve the steel physical properties

Question 8

The harness rating system that measure the depth of an indentation through testing is?

a) Brinnell system
b) Rockwell system
c) ball rebound hardness test
d) combination of both brinnell and rockwell

Answer 8

b) Rockwell system

Question 9

The Rockwell rating that shows the highest hardness is?

a) Rc33
b) Rc43
c) Rc53
d) Rc63

Answer 9

d) Rc63

Question 10

Toughness is?

a) the metal ability to resist denting by a blow
b) improved by making parts softer
c) improved by making parts harder
d) a parts ability to absorb high energy without breaking

Answer 10

d) a parts ability to absorb high energy without breaking

Question 11

parts possessing ductility

a) can absorb high energy without fracturing
b) are fractured easily when struck
c) are dented easily
d) can tolerate twisting and stretching

Answer 11

d) can tolerate twisting and stretching

Question 12

Yield strength is?

a) the stretching of a part beyond its plastic range
b) a parts ability to carry a load without permanent stretching
c) the bending the beyond its yield strength
d) ability to carry high load without breaking

Answer 12

b) a parts ability to carry a load without permanent stretching

Question 13

Fatigue strength is?

a) a parts ability to endure repeated load cycles without breaking
b) Testing parts endurance
c) a parts ability to carry load without permanent stretching
d) a parts ability to endure stress without breaking

Answer 13

a) a parts ability to endure repeated load cycles without breaking

Question 14

Cast steel is?

a) resistant to shock load
b) stronger then cast iron
c) is easily welded
d) all of the above answers

Answer 14

d) all of the above answers

Question 15

The primary purpose for rolling an ingot is to?

a) form steel into a shape such as a billet or plate
b) flatten a piece of steel
c) make steel stronger and tougher
d) relieve internal stresses

Answer 15

c) make steel stronger and tougher

Question 16

Forged steel parts?

a) have random internal grain structure
b) have a low tensile strength
c) are usually forged at room temps
d) are cost effective because parts are manufactured relatively easily

Answer 16

d) are cost effective because parts are manufactured relatively easily

Question 17

Powder mettallurgy is a metal forming process in which?

a) metal powders are compacted into shape and then sintered
b) parts do not require closes tolerances
c) metal is heated and hammered into
d) metal powders are melted, poured into a mold and sintered

Answer 17

a) metal powders are compacted into shape and then sintered

Question 18

The extrusion process results in manufactured parts that are?

a) case hardened
b) harder on the outside and tougher in the middle
c) highly finished and tougher
d) relieved of internal stress

Answer 18

c) highly finished and tougher

Question 19

The correct sequence of a typical heat treatment process is?

a) tempering, austenitizing and quenching
b) Austenitizing, quenching, tempering

Answer 19

b) Austenitizing, quenching, tempering

Question 20

The temperature at which changes in the cell structure of plain steel begin to occur is about?

a) 875 F
b) 1400 F
c) 1550 F
d) 1660 f

Answer 20

b) 1400 F

Question 21

During the austenitizing proccess?

a) carbon atoms enter FCC structure if enough time and temperature are provided
b) the parts must be through heated
c) the part must be heated to the upper critical temperature
d) all of the above

Answer 21

d) all of the above

Question 22

Quenching?

a) causes distortion in metal and cracking can occur
b) varies in cooling plates
c) cools metal to achieve a desired hardness
d) all of the above

Answer 22

d) all of the above

Question 23

The tempering stage?

a) allows a slight amount of carbon to escape from the unit cell
b) requires temperatures above the lower critical critical temperatures
c) decrease part toughness
d) is not common

Answer 23

a) allows a slight amount of carbon to escape from the unit cell

Question 24

The case harndening process that requires A,Q,T before case hardening is?

a) induction
b) carburizing
c) carbonitriding
d) nitriding

Answer 24

d) nitriding