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EP > EP > Flashcards

EP Flashcards

1
Q

Wht is a rechargeable battery called?

A

Nickel cadmium

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2
Q

Wht is the most basic battery called ?

A

Zinc carbon

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3
Q

Wht is a potentiometer?

A

Variable resistor

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4
Q

Wht is non polar?

A

It is when a component doesn’t have a positive or negative and can be connected any way round

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5
Q

Properties of acrylic (Perspex)

A

Hard wearing and will not shatter but will crack and scratch easily

Can be machined, drilled and threaded

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6
Q

Properties of HIPS (High Impact Polystyrene)

A

Light, flexible and string plastic

Can be cut, drilled, injection moulded, vacuum formed and blow moulded

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7
Q

Properties of ABS (Actylonitrile Butadiene Styrene)

A

High resistance to impact

Can be cut , drilled , injection moulded, vacuum formed and blow moulded

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8
Q

Properties of PVC (Polyvinyl Chloride)

A

Lightweight, hard wearing plastic

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9
Q

Properties of nylon

A

Tough with good resistance to wear

Self lubricating

Can be machined

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10
Q

Where is acrylic used

A 
Sings 
aircraft 
Windows 
Covers for car lights 
Washbasins
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11
Q

Where are ABS used ?

A

Car components
Tool handles
Cases for telephones
Kitchen appliances

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12
Q

Where are HIPS used ?

A

Toys
Boxes
Containers
Cases for electrical goods

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13
Q

Where is PVC used ,

A

Pipes
Guttering
Bottles
Window frames

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14
Q

Where is nylon used

A

Bearings

Gear wheels

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15
Q

What is GRP (Glass Reinforced plastic)

A

Type of thermosetting plastic

It’s a Polyester resin & hardener mixed together and reinforced with fibre glass

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16
Q

What is epoxy resin ?

A

Type of thermosetting plastic

It’s resin and hardener mixed together

17
Q

Where is Glass Reinforced Plastic (GRP) used ?

A

Canoes
Boats
Car bodies

18
Q

Where is epoxy resin used ?

A

Castings
PCB
Surface coating
Bonding of other materials

19
Q

Example of softwood

A

Pine

20
Q

Examples of hardwood

A

Oak
Mahogany
Beech

21
Q

Examples of manufactured boards

A

MDF (Medium Density Fibreboard)

Plywood

22
Q

How is MDF made?

A

By bonding wood fibres with resin based adhesive

23
Q

Elasticity definition

A

The ability of an object to regain its original shape after being deformed

24
Q

Ductility definition

A

The ability to be stretched without breaking

25
Q

Malleability definition

A

The ability to easily be pressed and hammered into shape

26
Q

Hardness definition

A

Resistance to scratching , cutting and wear

27
Q

Brittleness definition

A

How likely it is to break without bending

28
Q

Tensile strength

A

Ability to retain strength when stretched

29
Q

Toughness definition

A

Resistance to breaking , bending or deforming

30
Q

Typical materials used in injection moulding

A

Polythene
Polystyrene
Polypropylene
Nylon

31
Q

Common materials used in blow moulding

A

PVC
Polythene
Polypropylene

32
Q

Piezo transducer

A

Produces small voltage when deformed by mechanical movement

Common inexpensive transducer made of slice of piezo electric material bonded to brass disc

33
Q

Smart cable

A

Uses PIEZO ELECTRIC PRINCIPLE to convert mechanical energy into electrical

34
Q

Thermocolour sheet

A

Made by printing sheet with special type of THERMOCHROMIC LIQUID CRYSTAL tht changed colour when heated

Can also be heated by attaching resistance wife to back if sheet and used as heating element when small electric current passed through

EP (1 decks)

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