CHME-361

What is a tonne? 2000 kilograms 2200 kilograms 2000 pounds 2200 pounds 1000 kilograms

1000 kilograms

Ceramics and metals have moduli in the range from 30 to 300 GPa. What is the meaning of GPa? 10^6 N/m^2 10^15 N/m^2 10^12 N/m^2 10^3 N/m^2 10^9 N/m^2

10^9 N/m^2

An inch equals how many centimeters?

2.54

To five significant digits, how many liters equal a US gallon?

3.7854

If the consumption of a material grows at 2% per year, what is the consumption doubling time? 15 years 10 years 4 years 35 years 20 years

35 years

What is silicone? A polymer An element An oxide A composite An alloy

A polymer

Match the type of defect with the example. Amorphous region Point defect Line defect Plane defect Volume defect

Amorphous region-Non-crystalline structure Point defect- Missing atom Line defect- Extra half-plane of atoms Plane defect- Grain boundary Volume defect- Void,precipitate, or inlcusion

What is silicon? An alloy An element A composite An oxide A polymer

An element

According to the text, what happens to a polymer that is heated to the glass transition temperature? Cross-linking increases abruptly. Approximately half the Van der Waals bonds "melt". Polymerization initiates. The polymer becomes amorphous. Cross-linking decreases abruptly

Approximately half the Van der Waals bonds "melt".

Which type of structural member responds to a load by bending? Cable Beam Tie Column Shaft

Beam

What is a cantilever? Inclined plane Beam supported at both ends Beam supported at one end Column supported at one end Column supported at both ends

Beam supported at one end

In which mode does a beam carry a load? Torsion Buckling Bending Compression Tension

Bending

What is the term for a sideways deflection? Torsion Stretching Bending Necking Compression

Bending

Which type of material is an inorganic substance held together by ionic or covalent bonds, and composed entirely of nonmetallic elements or compounds of metals with nonmetals? Metal Polymer Composite Ceramic

Ceramic

Which materials are hybrids composed of two or more different materials that retain their distinct identities when combined? Metals Composites Polymers Ceramics

Composites

In which mode does a column carry a load? Compression Buckling Torsion Bending Tension

Compression

Which material contains aggregate? Glass Cement Concrete Silicon

Concrete

What is a cross-link in a polymer? Ionic bond between adjacent polymer chains Stiff fiber reinforcement Van der Waals bond between adjacent polymer chains Linear defect in a polymer crystal Covalent bond between adjacent polymer chains

Covalent bond between adjacent polymer chains

According to the text, which bonds are the stiffest? Covalent bonds Metallic bonds H-bonds Van der Waals bonds Ionic bonds

Covalent bonds

How are atoms linked together to form a polymer backbone? Covalent bonds Van der Waals bonds Ionic bonds Triple bonds Metallic bonds

Covalent bonds

What kind of bonds serve as cross links between polymer chains? Triple bonds Covalent bonds Van der Waals bonds Metallic bonds Ionic bonds

Covalent bonds

What is the term for slow, continuous plastic deformation under a constant load, usually at elevated temperatures, but below the melting point of the material? Corrosion Creep Fracture Fatigue

Creep

What does anisotropic mean in the context of this course? Independent of temperature Dependent on direction Homogeneous Spherically symmetric Independent of angle

Dependent on direction

What is the meaning of the percent sign (%)? Multiply by 100 Move decimal point to the left by one digit Round to nearest multiple of 100 Divide by 100 Move decimal point to the right by one digit

Divide by 100

Which is a reversible process? Elastic deformation Plastic deformation Fatigue Fracture Creep

Elastic deformation

In the context of this course, what is fatigue? Irreversible deformation under constant load Failure caused by chemical attack Reversible deformation under a load Failure caused by fluctuating loads Slow, continuous deformation over time under constant load

Failure caused by fluctuating loads

What is the general term for the product of a physical quantity (such as force) and its distance from a fixed point or axis? Resultant Complement First moment Second moment Tangent modulus

First moment

What is the principal advantage of aluminum alloy over steel for use in making a mast for oceangoing yacht? Higher modulus Greater strength Lower cost Lower density Greater corrosion resistance

Greater corrosion resistance

What is the term for resistance to permanent surface deformation or scratching? Toughness Stiffness Density Hardness Ductility

Hardness

What is the principal disadvantage of CFRP over aluminum for making a mass for oceangoing yacht. Greater ductility Higher cost Color Lower modulus Higher density

Higher cost

What is the resource base of an ore? Ore not yet discovered Known and estimated ore deposits All ore except the reserve Known ore that is economical to mine Ore stockpiled in anticipation of price rise

Known and estimated ore deposits

What is the reserve of an ore? Ore not yet discovered Known and estimated ore deposits Ore stockpiled in anticipation of price rise Known ore that is economical to mine All ore except the resource base

Known ore that is economical to mine

What is the matrix of a fiber-reinforced composite? Material in which fibers are embedded Discontinuous material Crystalline unit cell Superset of the Internet Simulated reality

Material in which fibers are embedded

Which material tends to have a high luster, high malleability, and high thermal electric conductivities? Polymer Composite Metal Ceramic

Metal

Which of the following is a material property? Load Modulus Deflection Component stiffness Cross-sectional area

Modulus

Which of the following is a material property? Modulus Cross-sectional area Component stiffness Load Deflection

Modulus

Which kind of object translates but does not rotate or change its shape? Deformable body Point mass Rigid body Non-newtonian fluid

Point mass

Which materials consist of large molecules formed by chemically bonding many repeating structural units? Ceramics Polymers Metals Composites

Polymers

Which kind of object can translate and rotate but not change its shape? Point mass Non-newtonian fluid Deformable body Rigid body

Rigid body

What is the general term for the product of a physical quantity (such as force) and the square of its distance from a fixed point or axis? Resultant Second moment Tangent modulus Complement First moment

Second moment

What is the major ingredient of most inorganic glasses? Silicone Aggregate Carbon Silica Alumina

Silica

Why is soda (Na2O) added to silica glass? Soda increases the density of the glass. Soda makes the glass stiffer. Soda raises the softening temperature. Soda makes the glass more resistant to chemicals. Soda lowers the softening temperature.

Soda lowers the softening temperature.

What is the yield strength? Stress at which the material strifes Stress at which the material becomes tired Stress at which plastic deformation begins Stress at which material breaks

Stress at which plastic deformation begins

What determines the price of an engineering material? Intrinsic properties Supply Demand Cost of production Supply and demand

Supply and demand

What is true of isotropic materials? They have nonuniform temperatures. They tend to be radioactive. They consist of fibers embedded in a matrix. they have the same composition but different weights. Their properties are independent of direction

Their properties are independent of direction.

In which mode does a shaft carry a load? Buckling Compression Bending Tension Torsion

Torsion

What is the term for the ability to mechanical energy without fracturing? Density Hardness Toughness Ductility Stiffness

Toughness

On a graph of price versus quantity, what is generally true of the supply curve? Upward sloping Downward sloping Almost always vertical Maximum at the equilibrium price Usually horizontal

Upward sloping

According to the text, which bonds are the least stiff? Van der Waals bonds Ionic bonds H-bonds Metallic bonds Covalent bonds

Van der Waals bonds

What is the term for the sideways deflection of a rotating shaft due to a centrifugal force? Fracture Buckling Whirling Torsion

Whirling

What does ubiquitous mean? Rare Ponderous Widespread Expensive Hazardous

Widespread