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ENG1011 - Engineering Methods - S1 2025

ENG1011 - Engineering Methods - S1 2025

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What was the difference between

the length of the Al 6063 sample while the force in question 2(c) is being applied, and
the length of the Al 6063 sample after the force in question 2(c) has been released?

In other words, how much did the specimen retract once the force was removed?

Give your answer in mm, to at least 2 significant figures

View this question

What was the elastic modulus for the Al 6063 sample that you determined in question 2(b)?

Give your answer in GPa, to at least two significant figures

View this question

FDM is a type of 3D printing that can be used for ...

Thermoplastic polymers

✅

Any type of polymer

❌

Thermoset polymers

❌

Certain types of metal

✅

View this question

A dislocation is ...

an extra line of atoms inserted into a 3D crystal structure

❌

a single extra atom inserted into a 3D crystal structure

❌

an extra plane of atoms inserted into a 3D crystal structure

✅✨

View this question

Which of the following are important to consider when using FDM printing to produce an object? (choose one or more answers)

The orientation of the fibres within the print

✅

Any voids created where layers did not properly adhere to each other

✅

Support materials for complex features such as overhangs

✅

View this question

Choose the statement which is TRUE

Work hardening results in materials becoming more brittle

✅

The work hardening rate is a material property that describes the optimum rate of elongation to efficiently produce dislocations

❌

A higher number of dislocations in a given material will lead to a decrease in modulus

❌

Dislocations always repel each other

❌✨

View this question

Additive manufacturing (choose one or more answers that are TRUE)...

is most useful for producing large numbers of an item

❌

can be useful in creating one-of-a-kind designs

✅

can be used for many different types of material, including metals, polymers and ceramics

✅

typically creates more waste during production than subtractive manufacturing methods

❌

View this question

Which of the following best describes the process of work hardening of metals.

The process of deforming the metal to increase the modulus

❌

The process of deforming the metal to increase the yield strength

✅✨

The process of changing the size of the metal crystals by heat treatment to increase the yield strength

❌

The process of alloying in other atoms to increase the yield strength

❌

View this question

In a thermoset polymer, the bonds between different chains are typically...

Covalent bonds

Secondary bonds

Ionic bonds

Metallic bonds

A 1 m steel bar is deformed so that it is now 1.1 metres long, while the force is still being applied. Which of the following is true?

The engineering strain in the sample is 10%

✅

The Poisson ratio tells us how much smaller the cross-section will now be

✅

The true strain in the sample is 10%

❌

The bar will remain exactly the same length once the force is removed

❌

The sample cross-section will also be thinner than it was originally

✅

View this question

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