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ENG1051 - Materials for energy and sustainability - S2 2025

ENG1051 - Materials for energy and sustainability - S2 2025

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What units are typically used for the cost of materials?

$/volume

$/kg

$/density

$/resource base

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Which of the following best describes the “Triple Bottom Line” for Sustainable Development

Climate Action, Economic, Social

Life below water, Life on Land, Climate Action

Environmental, Economic, Social

100%

Zero Hunger, Quality Education, Good Health & Wellbeing

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Using the following thermal transition data, which polymer would be most suited as a gear component in an automobile engine:

Polymer:Nylon, Tg (°C):50, Tm(°C):215

Polymer:Natural Rubber, Tg (°C):-75, Tm(°C):25

Polymer:PS, Tg (°C):100, Tm(°C):(non-crystalline)

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The elements found in Alumina are:

Al & O & Ti

Al & O & Ca

Al & O

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Upon heating through the glass transition temperature, which of the following occurs:

The secondary bonds melt

100%

The space between the polymer chains gets smaller

The modulus increases by several orders of magnitude

The primary bonds melt

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Soda glass is composed of an amorphous arrangement of silicate units.

True

False

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Which of the following is the equation for the true strain:

Image failed to load

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We do not typically observe a variation of the elastic modulus with test direction in a polycrystalline metal because. Which of the following best explains this observation:

The density of bonds varies with direction

There is a close packed direction in metals

The bond strength varies with direction

The grains are likely to be randomly oriented with their similar atom planes in various directions

100%

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During elastic deformation of a material in compression:

Select the correct answer:

the elastic modulus of the material decreases

the material is plastically deformed and the volume of the material decreases

the bonds are stretched as the atoms are displaced from their equilibrium position

the atoms move closer to each other in the direction of the applied stress