Engineering May 2011 Question and Mark Scheme Answers

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Thermosetting polymers - One specific material - One significant property
Bakelite/Neoprene - Heat resistant, insulator, easily shaped
1 of 25
Composites - One specific material - One significant property
Concret/MDF - Tough, easy to work
2 of 25
New materials - One specific material - One significant property
Shape memory polymers/Piezo-electric crystals - Returns to shape after working, pressure produces current
3 of 25
Elastomers - One specific material - One significant property
Rubber/Neoprene - Elasticity, shock absorbent
4 of 25
Non-ferrous metals - One specific materials - One significant property
Aluminium/Zinc - Light, good strength/weight ratio, corrosion resistant
5 of 25
Arc welding - One hazard involved in each process - One risk resulting from each hazard
Ultra violet/light radiation, hot metal - Eye damage, skin burns
6 of 25
Sawing metal tube - One hazard involved in each process - One risk resulting from each hazard
Sharp edges, falling tube - cuts on hands, injured feet
7 of 25
Injection moulding - One hazard involved in each process - One risk resulting from each hazard
Hot mould, fumes from release agent - Burns to hands, fume extractor
8 of 25
Metal turning - One hazard involved in each process - One risk resulting from each hazard
Sharp edges, loose fragments(Swarf) - Cuts on hands, eye damage
9 of 25
Outline the advantages and disadvantages of Galvanising
Durable, can be painted, seals cut edges, only suitable for low carbon steel, expensive, prevents corrosion/rusting
10 of 25
Outline the advantages and disadvantages of Painting
Easy to apply, relatively cheap, easy to clean, can be chipped or cracked, flammable process, comes in a variety of colours/aesthetic
11 of 25
Outline the advantages and disadvantages of Plastic Coating
Corrosion resistance, decorative, non-stick, expensive, relatively high thickness
12 of 25
Explain the preparation and process of galvanising the metal frame, including health and safety precautions
Work chemically cleaned, heated to a suitable temperature, fluxed, molten zinc, aluminium added for bright finish, work dipped, work cooled, precautions against heat/PPE, ventilation
13 of 25
Where on the graph is the range over which specimens extend elastically
Elastic range - Initial straight section
14 of 25
Where on the graph is the ultimate tensile strength
Ultimate tensile strength - max point (highest point on curve)
15 of 25
Where on the graph is the yield point
Yield point - first peak (Y)
16 of 25
A specimen tested has a uniform cross section: length 100mm, cross sectional area 30mm^2. 6000N increases the length by 0.3mm. State the formula and calculate the strain
strain = increase/original length = 0.3/100 = 0.003
17 of 25
A specimen tested has a uniform cross section: length 100mm, cross sectional area 30mm^2. 6000N increases the length by 0.3mm. State the formula and calculate the stress
stress = Force/Area = 6000/30x10^-6 = 200 x 10^6Nm^-2
18 of 25
Explain the difference in properties between thermosetting polymers and thermoplastic polymers
Thermosetting - Rigid, brittle, not softened by heating, cannot be reshaped - Thermoplastic - More flexible, soften when heated, can be reshaped
19 of 25
Name TWO materials used in the design of a lamp
Copper, steel, aluminium, PVC
20 of 25
Describe ONE property of TWO materials used in the design of a lamp
Copper - Good conductor, flexible, malleable - Steel - High tensile strength, tough - Aluminium - Good conductor, cheap, ductile - PVC - Good insulator, flexible, cheap
21 of 25
Describe using notes and sketches, how a hardness test is carried out
Brinell test - Steel/tungsten carbide ball indenter, downward load, test specimen, indentation
22 of 25
When two materials are tested using the Brinell test, explain how one is shown to be harder than the other
Smaller diameter, of indentation of harder, material
23 of 25
The support feet of the frame are manufactured from acrylonitrile-butadiene-styrene (ABS) using the injection moulding process. Explain why this process is suitable for the manufacture of the feet
Any shape can be obtained, complex shapes are possible, large numbers possible/quickly, economies of scale
24 of 25
Two materials that can be used for the frame of the seatbox are aluminium alloy and low carbon steel. Discuss the advantages and disadvantages of using aluminium alloy and low carbon steel for the frame of the seatbox
Aluminium alloy - lightweight, corrosion resistant, expensive, lower tensile strength - low carbon steel - inexpensive, higher tensile strength than aluminium, heavy, dense, corrodes/rusts if not protected
25 of 25

Other cards in this set

Card 2

Front

Composites - One specific material - One significant property

Back

Concret/MDF - Tough, easy to work

Card 3

Front

New materials - One specific material - One significant property

Back

Preview of the front of card 3

Card 4

Front

Elastomers - One specific material - One significant property

Back

Preview of the front of card 4

Card 5

Front

Non-ferrous metals - One specific materials - One significant property

Back

Preview of the front of card 5
View more cards

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