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GCSE Engineering > engineering theory 2 COPY > Flashcards

engineering theory 2 COPY Flashcards

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1
Q

why are aesthetic approaches important

A

colour psychology is all about how colour make people feel. different colours stimulate different parts of the brain

it contains important visible information about an abject and, at a basic level, allows us to distinguish between animals, plants, foods and fabrics

this makes the texture a significant part of the sensory input that we receive every day.

our senses respond to texture in two ways

physical texture can be felt by touch

visual texture is the illusion of physical texture we see

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2
Q

what are thermoset polymers

A

thermoset polymers are obtained by irreversibly hardening a soft solid or viscous liquid prepolymer. curing is induced by heat or suitable radiation and may be promoted by, high pressure, or mixing with a catalyst .

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3
Q

define epoxy resin and its properties

A

epoxy resin is a thermoset polymer. it has good heat resistance and hardwearing, formed by mixing together liquid resin and hardener to trigger cross linking. it is used in adhesives ad the production of laminates and reinforced plastic composites

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4
Q

define and describe urea formaldehyde

A

. it has a high tensile strength, low water absorption, high surface hardness used when producing electrical appliances casing also desk lamps, used in resins form to manufacture MDF sheets

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5
Q

define polyester resin

A

another thermoset polymer is polyester resin. it is similar to epoxy resins with good heat resistance and hardwearing surface. it is used in the production of reinforced plastic composites

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6
Q

define thermoplastics and describe them

A

thermoplastics polymer have a low density, lightweight and very flexible, high impact resistance, heat resistance, chemical inertness, transparent. it is used in automotive applications, household goods, containers, appliances, packaging

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7
Q

define and describe acrylic

A

it is transparent, has good impact and chemical resistance, scratch-resistant, good thermal insulator, uv resistant. it is used for aircraft windows, point of sales displays, medical components, lenses and furniture

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8
Q

define and describe polystyrene

A

high impact polystyrene is easy to mould. light and strong. high impact strength, good machinability. it is used in vacuum-formed packaging and casings appliance components, toy, tv, and audio-visual equipment parts, recording tape cassettes, bicycle trailer, toys. automotive instrument panels and fittings, petrol tanks. hot and cold drinking cups

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9
Q

what is an elastomer

A

An elastomer is a polymer with viscoelasticity and with weak intermolecular forces, generally low Young’s modulus and high failure strain compared with other materials.

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10
Q

define and describe rubber

A

rubber is a type of elastomer. it is abrasion-resistant, tear-resistant, it has high tensile strength, hardness, durability, flexibility

it is used in tyres tubes, hoses, belts, matting, flooring, medical gloves, adhesives

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11
Q

what is a title block and where is it found

A

a title block on a drawing is usually located in the bottom right hand corner and contains all the information necessary to identify the drawing. the title block is separated into different sections

the author, title, date of production, system of measurement, scale, projection, drawing number, sheet number, surface finish

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12
Q
  • what are the two main systems for measuring in engineering drawings
A

metric and imperial

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13
Q

what are metric units

A

millimeters, centimeters, meters, kilometers

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14
Q

what are imperial units

A

inches feet yard and miles

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15
Q

what do most countries use

A

most countries use metric system as their preferred system of measurement, with the exception of America, liberia and Myanmar

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16
Q

what are the benefits of using metric

A

metric is the worldwide standard. it is used by 96% of the owrlds population

set by international agreement an advantage for international trade

A decimal system

base 10 easy to convert units x by 10, 100, 1000

avoids errors

less errors for international trade when communicating drawings or manufacturing products

Future proof

the metric system is likely to previal as the only system of measurement internationally and non- metric units could be left behind the global economy

17
Q

what are the disadvantages of metric

A

not well studied for working with fractions

1/6 metre is approximately equivilant to 167 millimetres and 1/3 kilogram is approximately equal to 333 grams

18
Q

what are the benefits of using imperial

A

visualisation

easier to visualise in imperial than in metric

easilt divisible

base 12 divisible by 1, 2, 3, 4, 6 and 12

pre 1965

engineering drawings which pre-date 12965 will still be in imperial system

america, liberia and myanmar still use this system

america being in the top ten of the worlds largest global innovators for engineering.

19
Q

what are the disadvantages of imperial

A

conversion tables

imperial is not an easy measurement to convert into metric meaning they have to use conversion tables to assist in the process

smae name for different measurements

ton which can have several differet weights as there is a short ton and a long ton

20
Q

what is scaling

A

a drawing that shows a real object with accurate sizes reduced or enlarged by a certain amount is called scaling.

21
Q

why would we apply scales in drawings

A

the object may need to be scaled up or down so that it can fit onto the page

accurate use of scale will provide a clearly defined and accurate measurements so that the objects can be manufactures

accurate use of scale will ensure ease of communicating the design

22
Q

what are visible lines

A

a visible line is represented by a thick dark line, used to show the outline an objects visible edges and surfaces

23
Q

what are hidden lines

A

a hidden line is represented by a series of short dashes and is used to represent the lines or features which are not visible from the direction of view in a drawing

the hidden line should begin with a dash in contact with the line from which it starts

24
Q

what are centre lines

A

centre lines are represented by a series of alternate short and long dashes

this is usually used to indicate the centre of holes, circles, fillets or circular edges in a drawing, Although it can also used to indicate the cenre line of symmetry

a centre line should always ectend beyond the edges of a drawing

25
Q

what are construction lines

A

construction lines are usally the first lines to be drawn. they are very light and thin line use to construct the layout work on a drafting sheet

line weight is irrelevant as they do not appear on a final drawing, so in hand drafting they should be dark enough to see, but light enough to be erased easily

26
Q

what are dimension lines

A

dimension lines are drawn with an arrow on either end between two extension lines, with the dimension written alongside. the unit of measurement should also be given

27
Q

what are extension lines

A

extension lines are parallel lines that extend out from two points on the drawing. a small break should be added where the extenstion line meets the drawing

28
Q

what is tolerance

A

tolerance is what we use to explain how much inaccuracy we are willing to accept on a finished product. it is written as a +/- value

29
Q

what are the benefits of tolerance

A

allows more room for error which makes manufacturing easier

less time needs to be taken during manufacture as dimensions are not as critical (this would reduce cost as less tie is needed )

cost of manufacture would be less as less accurate machines are needed to manufacture the product

tolerance reduces the risk of product being rejected at the manufacturing stage

less time and the need for cheaper equipment would help the product get to the market quicker which means profit can be made sooner

30
Q

what is a first angle projection

A

when producing first angle projection drawing the object to be drawn is placed in the first quadrant

31
Q

what is a third angle projection

A

when producing third angle projection drawing the object to be drawn is placed in the third quadrant

32
Q

what is the current British standard for engineering drawings

A

the current british standard for technical drawings is BS8888 it is a national framework standard for engineering drawings

33
Q

what is the purpose of BS8888

A

the purpose of the standard allows technical drawings to be easily interpted by people with limited engineering knowledge

34
Q

what does the impact of BS888 include

A

users have one reference source with all the relevant information

enables users to speak the same language when talking when specifying and graphically representing products

provides precision and accuracy

helps easier transfer of design concept and manufacturing process

shortens development time

increase speed to market

35
Q

how is BS888 used in engineering

A

the various ways to indicate dimension

the way tolerance is identified

the way surface finish is identified

systems for adding : annotation, symbols and abbreviations

36
Q

what is ISO

A

ISO are the international organisation for standadisation they produce a framework for all businesses to follow, so there is a standard way of working recognised by all for products, services and systems, to ensure quality, safety and efficiency

37
Q

what are the two main benefits to using the Bristish standard in engineering

A

efficiency and effectiveness - if all engineers adapted their own way of producing engineering drawing it would be easy for the orignial draughtsperson, but other engineers may struggle to interpret the drawing correctly. this can either lead to mistakes being made or slower progress whilst drawing are interpreted

fewer errors- working to a standard ensures that everyone in the chain from design to realisation can understand what is required, resulting in fewer supplier problems, more accurate parts and components and fewer errors

38
Q

what are the other benefits of BS8888

A

it covers all the symbold and information that engineers need to include on their drawings

it includes, in one document , all the international standards needed to prepare technical product specifications

adhering to BS8888 benefits the production of engineering drawings - better efficiency and fewer mistakes being made. this in turn leads to a more productivity helping to increase revenue

GCSE Engineering (5 decks)

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