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DTE fourth form > Systems and Control/ Structures/ Mechanisms > Flashcards

Systems and Control/ Structures/ Mechanisms Flashcards

1
Q

What are the 4 structure types

A

Mass
Framed
Shell
Natural

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2
Q

Example of mass structures + common materials used to make them

A

Castle
Water damn
Pyramid igloo

Stone
Bricks
Re inforced Concrete
Soil

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3
Q

Example of framed structures

A

Bridge, roof trusses

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4
Q

Example of shell structures

A

Car, tent, aircraft fuselage

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5
Q

Example of natural structures

A

HUMAN SKELETON, mountains,waterfalls, grand canon

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6
Q

Shell structure common materials

A

Made from thin materials such as sheet steel or plastic to create a hollow structure

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7
Q

If the driver is smaller than the driven What happens to the out put speed relative to the input speed?

A

The out put speed is less

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8
Q

If the driver is bigger than the driven What happens to the out put speed relative to the input speed?

A

It will be more

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9
Q

If the driver is smaller than the driven What happens to the torque

A

It will be greater

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10
Q

If the driver is bigger than the driven What happens to the torque

A

The torque will be less

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11
Q

What does RPM stand for

A

Revolutions per minute

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12
Q

What is the torque equation?

A

T
D F

T = Torque
D= Distance (M)
F= Force (N)

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13
Q

Examples of a class one lever

A

Seesaw, scissors, pliers

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14
Q

Example of a class two lever

A

Wheelbarrow

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15
Q

Example of a class three lever

A

Spade, fisherman

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16
Q

What are the four key phrases for cams?

A

Rise
Dwell
Fall
one cycle

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17
Q

What is the rise?

A

The part of the Cam that causes the follower to rise

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18
Q

What is the dwell?

A

When the cam rotate, but the following does not rise or fall

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19
Q

What is the fall

A

The part of the Cam that causes the follower to fall

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20
Q

What is one cycle of a cam

A

One rotation/revolution of the cam

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21
Q

What are the types of followers? And draw

A

Flat followers
Pointed followers.
Rolling followers
Offset followers.

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22
Q

What are the advantages of rolling followers?

A

They stop the follow-up from deforming.
Friction and heat is reduced.

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23
Q

What are the four types of cams and draw

A

Pair/egg shaped cams
Ellipse cams
Eccentric/offset cams.
Snail cams

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24
Q

What are the four types of motion? And draw

A

Rotary
Linear
Oscillating.
Reciprocating.

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25
Q

What are the disadvantages of gears?

A

They are suited for slow speeds.
The gear teeth experience a large amount of stress.
They produce a lot of noise when operating at high speeds.
They have to be parallel. 

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26
Q

What are the advantages of gears

A

They have high positive drive (they can’t slip).

Less parts are needed- no belt or chain is needed.

They are very cheap.

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27
Q

Draw a reverse motion linkage

A
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28
Q

Draw a parallel/push pull linkage

A
29
Q

Draw a bell crank linkage

A
30
Q

Where are bell crank linkages used in real life

A

In the bike braking systems

31
Q

Draw a class one lever

A
32
Q

Draw a class two lever

A
33
Q

Draw a class three lever

A
34
Q

Draw a cantilever beam

A
35
Q

Draw a simply supported beam

A
36
Q

Draw an overhanging beam

A
37
Q

Draw a tie

A
38
Q

Draw a strut

A
39
Q

Draw a junction node

A
40
Q

What force is a tie under?

A

Tensile, pulling apart

41
Q

What force is a strut under?

A

Compression pushing together

42
Q

What is the name of the guy that makes sure the driver and driven rotate in the same direction

A

Idler gear

43
Q

What is the job of the idler gear?

A

To make sure that the driver and driven gears rotate in the same direction

44
Q

What does MIG Welding stand for?

A

Metal inert gas welding

45
Q

What are the advantages of MIG welding?

A

Mig welding is much faster than other forms of welding.

The worlds are generally cleaner than those produced by stick welding due to the nature of the protects of gas.

Longer worlds can be achieved

46
Q

Where are parallel or push/pull linkages used?

A

They are used in tool boxes

47
Q

Where can ratchet and Pawl’s be used?

A

The part of a rollercoaster that stops the rollercoaster from falling backward

48
Q

Where are cone pullies used?

A

Pillar drills

49
Q

frame structure definition

A

frame structure: a structure that is constructed using a ‘skeleton’ of individual parts

50
Q

mass structure definition

A

mass structure: a structure that is constructed by building or piling up materials such as stone, brick, concrete or soil

51
Q

natural structure definition

A

natural structure: a structure that occurs in nature and which is created by animals, birds, insects, fauna and flora and geological

52
Q

strut definition

A

strut: a structural member designed to resist compressive forces

53
Q

tie definition

A

tie: a structural member designed to resist tension forces

54
Q

beam definition

A

beam: a structural member which spans gaps and supports the loads acting on if

55
Q

truss definition

A

truss: a structural framework used to support loads, for example in a roof or bridge

56
Q

effort definition

A

effort: the force applied to the input part of a mechanism

57
Q

lever definition

A

lever: a mechanism used to move loads which will rotate around a fulcrum

58
Q

Load definition

A

load: the force that is supported or moved by a mechanism

59
Q

mechanism definition

A

mechanism: a device which uses moving parts to take an input motion and force, and converts it to a different motion and force

60
Q

cam definition definition

A

cam: a specially shaped part attached to a rotating shaft that imparts linear motion to a cam follower

61
Q

crank and slider definition

A

crank and slider: a mechanism used to change the rotary motion to reciprocating motion, or vice versa

62
Q

linear motion definition

A

linear motion: motion that follows a straight line

63
Q

rotary motion definition

A

rotary motion: motion in a circular path

64
Q

driven gear or pulley definition

A

driven gear or pulley: a gear or pulley driven by a driver gear or pulley

65
Q

driver gear or pulley definition

A

driver gear or pulley: a gear or pulley used to drive the system it is connected to

66
Q

gear system definition

A

gear system: a system of toothed wheels which transmits motion between shafts

67
Q

pulley definition

A

pulley: a wheel with a grooved rim in which a belt runs

68
Q

shell structure definition

A

an external source that has space inside

DTE fourth form (3 decks)

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