問題一覧
1
What do you call tin mill steel without a coating?
Black plate
2
What combination of elements has high electrical resistance, high corrosion resistance, and high strength at red heat temperatures, making it useful in resistance heating?
Nichrome
3
A steel cannot quainty for stainless prefx until it has at least how many percent of chromium?
10%
4
What do you add to compensate for the remaining high iron oxide content of the steel?
Deoxidizers
5
Which of the following cast irons is a high-carbon, iron-carbon-silicon alloy?
Gray Iron
6
Which cast iron is hard and wear resistant?
White Iron
7
What is considered as the general purpose, oldest type and widely used cast iron?
Gray Iron
8
The effect of manganese in cast iron is to?
reduce hardness by combining with sulfur below 0.5% and increa hardness above 0.5 %
9
The effect of aluminum in cast iron is to?
deoxidize molten cast iron
10
The effect of silicon in cast iron is to?
softens iron and increases ductility below 3.25%, hardens iron above 3.25 % and increase acid and corrosion resistance above 13 %
11
The effect of silicon in cast iron is to?
Soften iron and increases ductility below 3.25%, harden iron above 3.25% and increase acid and corrosion resistance above 13%
12
are you an is sad to be abundant in nature. About how many percent of the earths crust is iron?
5%
13
What is the advantage of quench hardening?
All of the choices
14
what is the lowest temperature diffusion hardening process and does not require a quench?
Nitriding
15
The following statements are true except one. Which one?
Quench hardened steel does not require tempering to prevent brittleness.
16
Which of the following is a requirement for hardening a steel?
All of the choices
17
What fields of study encompasses the procurement and production of metals?
Metallurgy
18
What do you call earth and stone missed with the iron oxides?
Gangue
19
What is the hole that has been previously burn in an oxygen poor environment?
Coke
20
What is the most common allergen ingredient in copper?
Zinc
21
What refers to the case hardening process by which the carbon content of the steel near the surface of a part is increased?
Carburizing
22
What is the process of heating a hardened steel to any temperature below the lower critical temperature, followed by any desire rate of cooling?
Tempering
23
What is defined as an intimate mechanical mixture of two or more pieces having a definite composition and a definite temperature of transformation within the solid state?
Eutectoid
24
what is the most undesirable of all the elements commonly found in steels?
Phosphorus
25
What impurity in steel can cause "red shortness" which means this steel becomes unworkable at the high temperature
sulfur
26
What is a method of case hardening involving diffusion in which the steel the biggest hardened its machined, heat treated, place in an airtight box and heated to about 1000°F?
Nitriding
27
What is the process of producing a hard surface in a steel having a sufficiently high carbon content to respond to hardening by a rapid cooling of the surface?
Flame hardening
28
What is the most common reinforcement for polymer composites?
Glassfiber
29
In electrochemistry oxidation is a loss of ____ .
electron
30
What is the process of putting back the lost electrons to convert the ion back to a metal?
Reduction
31
Oxidation in an electrochemical cell always takes place where?
at the anode
32
Reduction in an electrochemical cell always takes place where?
at the cathode
33
What do you call a fluid that conducts electricicty?
Electrolyte
34
The ____ of an environment serves as ameasure of the strength of acids or bases.
pH measurement
35
What is the pH value of a neutral solution?
7
36
The solution with a pH values from one to six are ____.
acid
37
the solutions with pH values from 7 to 12 are ___.
alkaline
38
pH stands for _____ .
positive hydrogen ion
39
What is defined as a local corrosion damaged characterized by surface cavities.
Pitting
40
What do you call the removal of zinc from brasses?
Dezincfication
41
What is the scaling off of a surface in flakes or layers as the result of corrosion?
Expoliation
42
What corrosion of occurs under organic coatings on metals is fine, wavy hairlines?
Filiform corrosion
43
Indicate the false statement about corrosion
The corroded member in a corrosion cell is the cathode
44
Steel is an alloy of iron and carbon with limits on the amount of carbon to less than ___ percent
2
45
What is the approximate chromium range of a ferritic stainless steel?
16% to 20%
46
Indicate the false statement about stainless steel
stainless steels have tensile moduli greater than those of carbon and alloy steels
47
What are the four major alloying elements of austenitic stainless steels
Iron, chromium, carbon and nickel
48
The electrical resistance of stainless steel's can be as much as times that ___ of a carbon steel
6
49
What refers to a shape achieved by allowing a liquid to solidify in the mold?
Casting
50
Which of the following is NOT a hardware requirement for die casting
Metal mold (machine halves)
51
What does iron has nodular or Spheroidal graphite?
Ductile iron
52
What is the process for making glass reinforced shapes that can be generated by pulling resin – impregnated glass strands through a die?
Continuous pultrusion
53
What is natural substance that makes up a significant portion of all plant life
Cellulose
54
What term is used to denote a family of thermosetting polymers that are reaction products of alcohols and acids
Alkydes
55
What is the AISI-SAE steel designation for nickel 3.50 alloy?
23XX
56
What is the AISI-SAE designation for results for resulfurized and rephosphorized carbon steel
12XX
57
The group H steel can be used in what temperature range
600°C to 1100°C
58
The following are primary alloying ingredients of group H steels except
Cobalt
59
The chrome of molybdenum steels contain how many percent of molybdenum?
0.20
60
The chrome vanadium steels contain how many percent of vanadium?
0.15 to 0.30
61
Manganese steel usually contains how many percent of manganese?
11 to 14
62
The wear– resistance of this material is attributed to its ability to ____ that is, the hardness is increase greatly when the steel is cold worked
Strain Harden
63
The special chrome steels of the stainless variety contain how many percent of chromium
11 to 17
64
What refers to the application any process whereby the surface of steel is altered so that it will become hard
Casehardening
65
What refers to the deterioration of material by oscillatory relative motion of small amplitude (22 to 100 mhu m) between two solid surfaces in corrosive environment?
Fretting corrosion
66
What refers to the ability of steel to be hardened through to its center in a large section?
Hardenability
67
what is the equilibrium temperature of transformation of austenite to pearlite?
1333°F
68
what structure is formed when transformation of occurs at temperatures down to the knee of the curve ?
Pearlite
69
What allotrophic form of iron refers to iron that has a temperature range of room temperature to 1670° F
Alpha iron
70
The alpha iron will become paramagnetic at temperature above ____.
770°C
71
What steel surface hardening process requires heating at 1000°F for up to 100 hours in an ammonia atmosphere, followed by slow cooling?
Nitriding
72
What is the chief ore of tin?
Cassiterite
73
What is the cheaf ore of zinc?
Sphalerite
74
what is the chief ore of titanium
Ilmanite
75
What is the mixture of gibbsite and diaspore, of which aluminum is derived?
Bauxite
76
The term "brass is very commonly used to designate any alloy primarily ____ and _____.
Copper and zinc
77
the term "bronze" is used to designate any alloy containing:
copper and tin
78
In a system of designating wrought aluminum alloys, a four digit number is used. What does the first digit indicates?
The alloy group
79
in a system of designating wrought aluminum alloys, what does the second digit represents?
The modification of the other group of impurity limits
80
In the system of designating wrought aluminum alloys, the letter if that follows the number indicates what condition of the alloy?
As fabricated
81
The following alloys are the chief alloys that are diecast except:
Manganese alloys
82
what is the minimum tensile strength of gray cast iron class 50?
50000 lbf/in^2
83
what is the carbon content of wrought iron?
Less than 0.1 percent
84
Nico is an alloy containing how many percent nickel ?
14%
85
The most common beta brass with a composition of 60% copper and 40% zinc is called ____ .
Muntz metal
86
Redbrass contains about how many percent of zinc ?
30%
87
Indicate the false statement.
Tin is relatively soluble in copper
88
What is the most abundant metal in nature
Aluminum
89
Indicate the false statement about aluminum
It has poor thermal and electrical conductivity
90
What is the effect to aluminum with iron as the alloying element
Reduce hot – cracking tendencies in casting
91
What is the effect the aluminum with copper alloying element?
Increases strength up to about 12%
92
Which off the following are too well-known nickel alloys with magnetic properties ideal for permanent magnets?
Alnico ang cunife
93
The Portland cement is manufacture from the following element except :
Asphalt
94
What gives the average facial of stress to strain for materials operating in the nonlinear region in the stress strain diagram?
Secant modulus
95
What is the ratio of the ultimate failure strain to the yielding strain?
Ductility
96
What what does the term means the harden ability of a steel specimen?
Jominy end-quench test
97
What steel relief process is used with hypoeuctectoid steels to change martenite into pearlite
Tempering
98
What is another term of tempering?
Drawing or toughening
99
All are steel surface hardeing processes except one. Which one?
Annealing