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8 - Engineering Materials > 8.1 - Low Voltage DC Power Supply > Flashcards

8.1 - Low Voltage DC Power Supply Flashcards

1
Q

Enclosure material?

A

Acrylonitrite Butadiene Styrene (ABS)

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2
Q

Enclosure material qualities?

A 
Tough
Impact resistant
Good electrical insulator
Inexpensive
Malleable
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3
Q

Enclose purpose?

A

Protects components

Lowers risk of electric shock if touched when ‘live’

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4
Q

Transformer Core material?

A

Laminated steel strips (stamped from thin sheets)

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5
Q

Transformer Core material qualities?

A

Excellent ferromagnetic properties (strong magnet)

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6
Q

Transformer Windings material?

A

Enamelled copper wire (drawn out until a wire of the desired length is achieved, given thin enamel coating for insultation)

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7
Q

Transformer Windings material qualities?

A

Low resistance
Non-magnetic
Malleable

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8
Q

Transformer Windings purpose?

A

Turns a higher voltage (mains 230V) to smaller voltage for electrical device usage
More primary windings than secondary, voltage drops

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9
Q

Power Lead material?

A

Copper wire with multiple strands (flexible), with plastic insulating coating

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10
Q

Power Lead material qualities?

A

Excellent conductor

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11
Q

Printed Circuit Board material?

A

Glass-fibre reinforced plastic (composite material), given etched copper laminating coating to provide required coating track pattern (links component leads and pins)

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12
Q

Printed Circuit Board material qualities?

A

Strong

Good electrical insulator

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13
Q

Heat Dissipator (‘heat sink’) material?

A

Aluminium Alloy, shaped via extrusion

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14
Q

What is extrusion?

A

Hot alloy forced under pressure into a shape with a continuous cross-section, eg. heat sink

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15
Q

Heat Dissipator (‘heat sink’) material qualities?

A

Good heat conductor (cools circuit quicker)

Lightweight

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16
Q

Heat Dissipator (‘heat sink’) purpose?

A

Conducts heat away from an integrate circuit voltage regulator, convects it into surrounding space

17
Q

Semiconductor material?

A

Silicon

Gallium Arsenide

18
Q

Semiconductor material qualities?

A

Provide neither good nor bad electrical insulation, depends on amount and polarity of supplied voltage

19
Q

Semiconductor devices?

A

4 Rectifier diodes
LED
Integrated circuit voltage regulator

20
Q

Retaining Screws material?

A

Steel with black oxide finish

21
Q

Retaining Screws material qualities?

A

Strong, forms own threads when inserted into soft plastic case pillars

22
Q

Material selection criteria?

A

Availability (silver better than copper, but rarer)
Forms (need an Ali bar, only get blocks)
Cost
Properties (eg. strength, conductivity, heat resistance)
Manufacturing capability (can it be pressed, rolled, bent)
Environmental capabilities (eg. high temps, damp)

8 - Engineering Materials (3 decks)

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