Mock Revision

Question 1

what’s the definition of wasting?

Answer 1

any process that involves removal or wasting of material

Question 2

whats an example of wasting?

Answer 2

laser cutting, drilling, lathe work, punching

Question 3

whats the process that involves changing or manipulating materials WITHOUT melting?

Answer 3

deformation

Question 4

whats an example of deformation?

Answer 4

vacuum forming, steam bending, rolling, line bending

Question 5

what is the definition of redistribution?

Answer 5

any process involving melting and then cooling to form a solid object.

Question 6

whats an example of redistribution?

Answer 6

injection moulding, split pattern casting, extrusion

Question 7

what is the definition of fabrication?

Answer 7

ay process involving joining parts together to make a whole product.

Question 8

what are lamination, riveting, and welding examples of?

Answer 8

fabrication

Question 9

what is the definition of hardwood?

Answer 9

Timber from Broad leaved (Deciduous) trees.
Trees that lose their leaves in Autumn.
Generally producing stronger, harder and more durable timber but slower growing.

Question 10

what is the definition of softwood?

Answer 10

Timber from Coniferous (cone bearing) trees.
Trees that keep their needles / leaves all year and are considered evergreen.
Generally faster growing.

Question 11

what are some examples of hardwood?

Answer 11

oak, ash, mahogany, beech, birch

Question 12

what are some examples of softwood?

Answer 12

pine, spruce, cedar

Question 13

define ergonomics?

Answer 13

design elements that help a product interact with a human

Question 14

what are common good ergonomic design features?

Answer 14

grips that fit the hand,
rubber grips,
buttons easily accessible,
visibility,
contrasting colours,
good balance

Question 15

what are the uses of softwood?

Answer 15

cheap quality furniture, simple joinery, indoor work including bedroom and bathroom furniture, windows

Question 16

what are the uses of hardwood?

Answer 16

high quality furniture, tool handles, flooring, outdoor furniture (long term)

Question 17

which type of wood is coniferous?

Answer 17

softwood

Question 18

what type of wood is deciduous?

Answer 18

hardwood

Question 19

what is a smart material?

Answer 19

a material whose physical properties change in response to a change in the environment. for example electricity, pressure, temperature, light.

Question 20

what is a SMA( shape memory alloy)?

Answer 20

a material that changes shape in response to temperature or electrical input.

Question 21

where are shape memory alloys used?

Answer 21

dental braces, self closing windows, plane wing flaps, stents, bone plates etc.

Question 22

what is thermochromic pigment/paint?

Answer 22

a material that changes colour in response to a temperature change.

Question 23

where is thermochromic pigment/paint used?

Answer 23

baby spoons, bath monitors, thermometers, mugs and kettles etc.

Question 24

what is phosphorecent pigment/paint?

Answer 24

a material that absorbs and re emits light ie glow in the dark

Question 25

whhere is phosphorecent pigment/paint used?

Answer 25

fire exit signs, glow in the dark products, watch hands/faces, nightlights.

Question 26

what are the good properties of aluminium?

Answer 26

Advantages: - Lightweight for it's strength - Corrosion resistant compared to other metals (self forming oxide layer - anodizing principle - Readily available - a very common element (bauxite) - Highly recyclable and recycled - Low melting point - cheaper energy costs for casting etc - Easy to machine (softer than other metals) - Good thermal conductor (heat sinks, casings that need to dissipate heat - e.g. engine blocks etc ) - Average electrical conductor (good copper substitute for cheaper items) - Highly polishable - Ductile & Malleable in certain forms.

Question 27

what are the bad properties of aluminium?

Answer 27

Disadvantages: - Low hardness - not good for wearing surfaces/bearings etc - Low tensile strength compared to steel - Low toughness - Tends to crack rather than bend under sudden impact - Low melting point (680C) - makes it unsuitable for some components (e.g jet engines) - High initial extraction cost compared to other metals (requires large amounts of electricity - Tricky to weld - needs annealing post welding to maintain strength or pre-heating before welding -Needs to be alloyed with other materials to make it useful - usually magnesium -Raw Aluminium is very brittle and a poor material - the material you all associate Aluminium is actually Duralumin - an alloy.

Question 28

what are properties of steel and how is that useful?

Answer 28

- germicidal -> useful for kitchenwear - non corroding -> used outdoors in cars, railroads etc - good thermal conductor -> used for pots and pans - self finishing -> great for mass production - easily polished and maintains a shine -> aesthetics - hard and high tensile strength/toughness relative to other metals -> used for building

Question 29

what is the process of anodizing?

Answer 29

(LEARN DIAGRAM) 1) the part is etched/cleaned in sulfuric acid. 2) the part to be anodized is then made the anode in a DC electrical circuit where current is passed through an electrolyte solution.  3) This causes oxygen to leave the electrolyte and build up as an oxide layer on the anode (the part) as hydrogen is given off at the cathode. 4) The oxide layer is then porous and harder than the base metal underneath.  5) The part is removed from the electrolysis tank and placed in a coloured dye, which absorbs into the oxide layer giving the part a colour. 6) The part is then placed in boiling water to seal up the pores and trap the dye inside the layer.

Question 30

what are the benefits of anodizing?

Answer 30

- >very hard finish compared to spray paint - wont scratch as easily or chip like paint. - >fairly easy to automate in a factory setting - for mass production. - >can anodize hard to reach areas that paint may not get to. - >acts as a barrier to corrosion - whereas corrosion can get below paint layer.

Question 31

what are the drawbacks of anodizing?

Answer 31

- >Chemicals involved in manufacture . - >Limited range of colours/shades . - > Can be time consuming for one off jobs.