May 2018 Flashcards
Explain what is meant by the term electrical conductivity and give one specific example of a product which requires this property.
The term electrical conductivity refers to the movement of electricity through a piece of material. Good conductive materials allow electricity to pass
through them whilst insulating material resists the flow of electricity. (switch
Explain what is meant by the term thermal conductivity and give one specific example of a product which requires this property.
The term thermal conductivity refers to the movement of heat through a piece of material. Heat transfer occurs at a lower rate across materials of
low thermal conductivity than across materials of high thermal conductivity. (saucepan)
Give one property of polyethylene terephthalate (PET) which makes it specifically suitable for fizzy drinks bottles.
Good resistance to pressure. Lightweight.
Give one specific application for the use of PVC and outline one main specific characteristic which makes it suitable for your chosen application.
Window frames. Weather resistant.
Briefly outline one main property and one main working characteristic
associated with Beech.
Tough & easy to work with
Give two specific properties of mahogany.
Durable & Fairly strong.
Injection moulding is a process which may be used to manufacture cases for computer monitors and vacuum cleaners.
Give one main reason why the injection moulding process may be used to manufacture these cases.
Can produce a product with high degree of dimensional accuracy
In the space below, draw a detailed annotated sketch of the injection moulding process.
should include granules, hopper, motor, screw thread, heater, split mould.
Distinguish between a thermochromic material and a photochromic material.
A thermochromic material is a material which changes colour at a specific temperature whereas a photochromic material is a material that undergoes colour change induced by exposure to different lighting conditions.
Give two main properties of graphene which make it suitable for use in phones.
Excellent conductivity. High level of durability.
Outline two different ways how Virtual imaging may assist in the design and development for a product of your choice.
Virtual images can be manipulated on-screen.
Virtual imaging provides a quick interaction with the client which can speed up the process saving time and money.
Outline two different ways how Rapid prototyping may assist in the design and development for a product of your choice.
Rapid prototyping allows designers to realise their concepts beyond virtual visualisation. This enables one to understand the look and feel of the design and help justify changes in the development.
Rapid prototyping ensures that one has the physical model in hand. This can help develop the product quickly as it is possible to get instant feedback from customers.
