MENG130 Test 1 Wells
Approximately how many different elements have been identified?
100
About what percentage of the U.S. gross domestic product (GDP) is accounted for by the manufacturing industries?
12
What are the four categories of engineering materials used in manufacturing?
Materials, Ceramics, Polymers, and Composites
What is the difference between primary and secondary bonding in the structure of materials?
Primary bonding is strong bonding between atoms in a material, for example to form a molecule; while secondary bonding is not as strong and is associated with attraction between molecules in the material.
A production planning and control department accomplishes which of the following functions in its role of providing manufacturing support?
Schedules the order of products on a machine
how well a material will resist scratching. Usually tested by the Brinell and Rockwell Hardness Tests
What is hardness, and how is it generally tested
noble metals
copper, silver, and gold
Which of the following pure metals is the best conductor of electricity:
silver
Which of the following is a standard category in the Periodic Table?
metals
A tolerance is which one of the following:
total permissible variation from a specified dimension
Copper is generally considered easy to weld because of its high thermal conductivity
false
The thermal expansion properties of polymers are generally _____ those of metals.
greater than
An outside micrometer would be appropriate for measuring which of the following?
shaft diameter
In a GO/NO-GO gage, which one of the following best describes the function of the GO gage:
checks maximum material condition
when atoms share electrons
covelant bonds
Which one of the following types of stress strain relationship best describes the behavior of brittle materials such as ceramics and thermosetting plastics:
perfectly elastic
the maximum load experienced during the tensile test divided by the original area.
tensile strength
A pure metal element melts at one temperature (the melting point), while an alloy begins melting at a certain temperature called the solidus and finally completes the transformation to the molten state at a higher temperature called the liquidus.
A pure metal element melts at one temperature (the melting point), while an alloy beg
What is the difference between engineering stress and true stress in a tensile test
Engineering stress divides the load (force) on the test specimen by the original area; whereas true stress divides the load by the instantaneous area which decreases as the specimen stretches.
How do grain boundaries contribute to the strain hardening phenomenon in metals?
Grain boundaries block the continued movement of dislocations in the metal during straining. As more dislocations become blocked, the metal becomes more difficult to deform; in effect it becomes stronger.
defines the stress strain relationship for an elastic material
Hooke's law.
Inventions of the Industrial Revolution include which one of the following:
Steam engine
What are the three types of static stresses to which materials are subjected?
Tensile, compressive and shear
Which one of the following materials has the highest hardness:
alumina ceramic
a reliability term which is simply the proportion uptime of the equipment.
availability
The mass diffusion rate dm/dt across a boundary between two different metals is a function of which of the following variables:
concentration gradient dc/dx
Polymers are characterized by which of the following bonding types ?
covelant
an ionized solution capable of conducting electric current by movement of the ions.
electrolyte
How are product variety and production quantity related when comparing typical factories?
inversely
atoms of one element give up their outer electron(s) to the atoms of another element to form complete outer shells.
ionic bonding
application of physical and chemical processes to alter the geometry, properties, and/or appearance of a given starting material to make parts or products
manufacturing
Which of the following is likely NOT to be a GO/NO-GO gage?
master gage
Mining is classified in which one of the following industry categories
primary
High volume production of assembled products is most closely associated with which one of the following layout types?
product
the temperature at which a metal recrystallizes
recrystallization temperature for a metal
How is shear strength S related to tensile strength TS, on average
shear strength is .7 times the tensile strength
In the heating of most metal alloys, melting begins at a certain temperature and concludes at a higher temperature. In these cases, which of the following temperatures marks the beginning of melting:
solidus
The quantity of heat energy required to increase the temperature of a unit mass of the material by one degree.
specific heat
A company's available set of manufacturing processes
technological processing capability
the capacity of a material to transfer heat energy through itself by thermal movement only
thermal conductivity
If stress values were measured during a tensile test, which of the following would have the higher value:
true stress
Common point defects in a crystal lattice structure
vacancy, when an atom is missing; ion-pair vacancy, when two different kinds of atoms are missing; interstitial, when there is an extra atom; and displaced ion, which occurs when an ion becomes removed from its original position.
the increase in strength that occurs in metals when they are strained.
work hardening
the stress at which the material begins to plastically deform
yield strength
A superconductor is characterized by which of the following :
zero resistivity