ME 3010 Test 1

In metallic bonding, the valence electrons of the metallic materials ___.

A) are shared between adjacent atoms
B) are given up by one atom ot another
C) are not bound to any particular atom
D) weak electrostatic attractions between atomic or molecular dipoles

___ is the bonding that can be found in neon (Ne).

A) Covalent
B) Metallic
C) Ionic
D) Van der Waals

An example of a ___ solid solution is found for Cu-25wt%Ni alloy? The atomic radii of Cu and Ni are 1.28 and 1.25A, respectively.

A) vacancy
B) ordered
C) substitutional
D) interstitial

Plywood is an example of ___ material.

A) ceramic
B) composite
C) biomaterial
D) metallic

___ is the primary bonding that can be found in polyvinyl chloride (PVC).

A) Metallic
B) Ionic
C) Van der Waals
D) Covalent

___ provides magnifications up to approximately 2000x and is a relativiely low-cost instrument.

A) X-Ray diffractometer
B) Optical Microscope
C) EDS
D) SEM

Which of the following molecular structures of polymers show the highest strength?

A) branched
B) network
C) linear
D) partially cross-linked

Epoxy is an example of ___. They become permanently hard when heat is applied and do not soften upon subsequent heating.

A) elastomers
B) thermoplastics
C) thermosets
D) carbon nanotubes

Which of the following does not belong to the three types of primary interatomic bonding?

A) Van der Waals
B) Ionic
C) Covalent
D) Metallic

The modulus of elasticity is a measure of how ___ the material is.

A) tough
B) strong
C) stiff
D) ductile

Microhardness testing was conducted on two cast irons. Both images were taken at 150x. Which material is stronger?

A) Specimen #1
B) Specimen #2
C) Need to have the hardness values in order to compare
D) They are the same

Polyethylene is classified as a ___ material.

A) polymer
B) metallic
C) composite
D) ceramic

Tungsten Carbide (WC) is classified as a ___ material.

A) polymer
B) composite
C) metallic
D) ceramic

Which of the following techniques can be used to determine the crystal structures of crystalline materials?

A) Optical Microscopy
B) Energy-Dispersive Spectroscopy
C) X-Ray Diffraction
D) Scanning Electron Microscopy

The key phase for describing covalent bonding is ___.

A) sharing electrons
B) secondary bonding
C) free electrons
D) transferring electrons

The number of atoms in a FCC unit cell is ___.

A) 4
B) 2
C) 6
D) 8

If the micron bar in the following micrograph is 15 mm, what is the magnification of the image?

A) 150
B) 15
C) 1,000
D) 15,000

Which of the following is not a step involved in the metallographic sample preparation?

A) Etching using the right etchant
B) Mounting
C) Grinding/Polishing
D) Vicker's Hardness Evaluation

Which of the statements regarding Van der Waals bonding is not correct?

A) In many plastic materials (e.g., Teflon, PVC), Van der Waals forces provide an extra binding force between the chains of these polymers.
B) Van der Waals bonding can be found in inert gases.
C) Van der Waals bonding is an example of secondary bonding because it does not contribute to materials properties.
D) Van der Waals bonding is essentially a weak electrostatic attraction between atomic or molecular dipoles.

The hardness value of which hardness test is based on the depth of penetration rather than the indented area?

A) Rockwell
B) Brinell
C) Vickers
D) Knoop

Ordinarily, when the strength of a metal is cited for design purposes, the ___ is used.

A) 0.002% offset yield strength
B) 0.002 offset yield strength
C) tensile strength
D) ultimate tensile strength

Which of the following is an example of an "alloy"?

A) Nickel
B) Bronze
C) Tin
D) Titanium

The nucleus of an atom contains?

A) protons
B) electrons
C) neutrons
D) both protons and neutrons

Which crystal structure does the following unit cell drawing represent?

A) Body-Centered Cubic (BCC)
B) Face-Centered Cubic (FCC)
C) Body-Centered Tetragonal (BCT)
D) Hexagonal Close-Packed (HCP)

Which of the following hardness tests is a microhardness test?

A) Nanoindentation
B) Vickers
C) Brinell
D) Rockwell

Which of the following is a linear defect?

A) interstitial defect
B) substitutional defect
C) dislocation
D) grain boundary

A spheroidite steel with the following microstructure is a ___ composite.

A) particle-reinforced
B) fiber-reinforced
C) polymer-matrix
D) laminar

1s²2s²2p⁶3s²3p⁶3d⁷4s² is the electron configuration of the material of ___.

A) alkali metal
B) halogen
C) transition metal
D) alkaline earth metal

A more recent and extremely useful investigative tool for microstructural observation utilizing electron beams is the ___.

A) X-Ray diffraction
B) Vickers hardness testing
C) optical microscope
D) Scanning electron microscope

Atomic mass is the mass of ___ in the nucleus of an atom.

A) protons + electrons
B) protons + neutrons
C) protons
D) valence electrons