ES037A-K1 Prelim Exam

Thermoplastic materials are those materials which

• are formed into shape under heat and pressure and results in a permanently hard product.

• are used as a friction lining for clutches and brakes.

• are flexible and can withstand considerable wear under suitable conditions.

• do not become hard with the application of heat and pressure and no chemical change occurs.

The hardness is the property of a material due to which it

• can be drawn into wires.

• breaks with little permanent distortion.

• can be rolled or hammered into thin sheets.

• can cut another metal.

What are considered as the "building blocks" for engineering materials?

• Compounds

• Matters

• Elements

• Atoms

What types of materials behave like iron when placed in a magnetic field?

• Crystals

• Ferromagnetic materials

• Amorphous materials

• Metalloids

Polymer comes from Greek words "poly" which means "many" and "meros" which means

• strength.

• material,

• part.

• plastic.

What is a combination of two or more materials that has properties that the components materials do not have by themselves?

• Compound

• Mixture

• Composite

• Matrix

What physical property of a material that refers to the rate of heat flow per unit time in a homogenous material under steady-state conditions per unit are, per unit temperature gradient in a direction perpendicular to area?

• Thermal expansion

• Heat distortion temperature

• Hot water absorption

• Thermal conductivity

It refers to the amount of heat required to raise the temperature of any amount of a substance by 1 degree.

• Latent heat

• Heat capacity

• Heat of fusion

• Heat of fission

Which material combination demonstrates a strength-to-weight ratio suitable for helicopter X-wing structures while maintaining fatigue resistance?

• Carbon-fiber-reinforced polymer

• Nickel-based superalloys

• Tungsten carbide-cobalt (WC-Co)

• SiO2-Na2O-CaO glass

Which functional classification of materials would include shape-memory alloys responding to temperature changes in actuator systems?

• Structural materials

• Smart materials

• Energy technology materials

• Photonic materials