DEN218 sample questions.doc

8/14/2019 DEN218 sample questions.doc

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DEN218 Graphical communications indesign and manufacture

The exam will comprise 20 marks for multiplechoice and 80 marks for short answers on thequestion paper. There will be no choice. Thematerial examined will cover the wholematerials and manufacture lecture series.

Below are listed some example questions,which are typical of the material that will eincluded!

1.What is meant by yield strength of amaterial

2.Identify 3 ways in which a metal canbe strengthened and explain how theincrease in strength is achieved ineach case

3.The modulus of diamond which is aform of carbon is approximately 1000

!a. The modulus of a typicalthermoplastic polymer which is


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primarily a long"chain moleculebased on carbon chains is typically 1# 2 !a. $xplain the difference in

modulus values in terms of bondingin the material% the molecularstructure and the arrangement ofmolecules in the solid material.

&.'ow can you influence the mechanicalproperties of a given polymer

(.What are the units of toughness)It has no units

*+m2,m-g

.Which material has the highest criticalstrain energy release rate/ild steel!olypropylene!olystyrene

ement


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lumina

.What is the difference between high

and low cycle fatigue)


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.Introducing a small sharp crac4 into arod of glass will

5ower the yield strength/a4e the glass crystalli6e7educe the fracture stressIncrease the strain to failure

8.Which of the following is correct)9The yield strength describes the onsetof nec4ingThe yield strength describes the onsetof plastic flowThe yield strength describes the onsetof elastic flowThe yield strength describes the onsetof brittle fracture

10. reep of a material involves:

;rittle fracture$lastic deformation!lastic deformationThermal shoc4


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11.


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1


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22.


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DEN218 sample questions.doc

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