Assesment 1

Question 1

Properties and definition of thermoplastics

Answer 1

During processing the chemical composition remains unchanged and the material can be reshaped many times

Question 2

Properties and definition of Thermosetting plastics

Answer 2

Changes chemically during the moulding process and cannot be reshaped any further

Question 3

Properties of acrylic

Answer 3

Good light transmitting properties, hard and ridged and is available in lots of colours. Used for display signs and jewellery

Question 4

What does PVC stand for

Answer 4

Polyvinyl chloride

Question 5

Properties of PVC

Answer 5

Biologically and chemically resistant, cheap, durable and easy to assemble. Water proof and used in clothing

Question 6

Define electrical conductivity

Answer 6

Is a measure of a materials ability to conduct an electric current

Question 7

Define thermo conductivity

Answer 7

Is the property of a material that indicates it’s ability to conduct heat

Question 8

4 common forms of metal

Answer 8

Sheet, angle, channel, flat bar

Question 9

Properties of high carbon steel

Answer 9

Very hard and brittle, less tough and malleable(easily formed) , difficult to cut can withstand wear and shearing. Used for cutting tools and saw blades

Question 10

Properties of abs

Answer 10

Good shock absorbance, tough, stability under load is excellent, 2x cost of producing polystyrene although it has better hardness, gloss, toughness and electrical insulation properties. Some products- automotive body parts, head gear

Question 11

Properties of polystyrene

Answer 11

2 forms: expanded and ridged, transparent, colours well, has impact resistance, light and buoyant, good insulator. Used for food containers, packaging and insulation

Question 12

Material selection considerations (6)

Answer 12

•function requirements
•manufacturing demands (scale of production, sustainability)
•environment (corrosion resistance)
•Availability (common forms, sizes)
•cost
•appropriate joining methods

Question 13

Properties of graphene

Answer 13

Made from honeycomb sheets of carbon just one atom thick, one of the lightest, thinnest, best heat and electricity conducting materials ever discovered, almost completely transparent

Question 14

Applications of graphene

Answer 14

Could revolutionise everything from computing, car tires, solar cells to smoke detectors

Question 15

Properties of ferrous metals

Answer 15

Contains iron, small amounts of other metals or elements added, magnetic and little resistance to corrosion

Question 16

Types of ferrous metals

Answer 16

Cast iron, carbon steel, alloy steel

Question 17

Properties of non-ferrous metals

Answer 17

Do not contain iron, non magnetic, usually more resistant to corrosion than ferrous metals

Question 18

Types of non ferrous metal

Answer 18

Aluminium, zinc, lead, copper

Question 19

Properties of manufactured boards

Answer 19

Large availability, veneers can be applied, large stable sheets and uniform thickness and quality

Question 20

Applications of manufactured boards

Answer 20

Doors, internal panelling, skirting boards

Question 21

Definition of holograms

Answer 21

An image that appears to be 3D which can be seen by the naked eye, a photographic recording of a light field rather than a image formed by lens

Question 22

List the 3 types of hologram

Answer 22

Reflection, transmission, EM based

Question 23

Reflection hologram definition

Answer 23

Illuminated by a white light source on the viewing side of the hologram. Light is reflected from the hologram to show the image

Question 24

Transmission hologram definition

Answer 24

Views by illuminating from the rear with a laser. Advantages are that it can be a very sharp image with great detail and great depth

Question 25

Embossed hologram definition

Answer 25

Found on credit cards. Embedded on the plastic film backed with reflective aluminium. The aluminium reflects incident light back through the hologram activating it.

Question 26

How do photochromic materials work

Answer 26

Change colour as the temperature changes

Question 27

Used for photochromic materials

Answer 27

Used on contacts thermometers and test strips on the side of batteries(heat comes from the resistor) also used as food packaging materials to show when food is cooked to the correct temp