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Cert 2 Mechanical Engineering > MEA109 Part C > Flashcards

MEA109 Part C Flashcards

1
Q

True or false - Pure iron is unsuitable for use on aircraft.

A

True

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2
Q

Why is carbon added to pure iron

A

to increase it strength

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3
Q

What are the 2 components of alloy steel?

A

Carbon steel and other metal

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4
Q

Low carbon steel

A

0.1% - 0.3% carbon content

Safety wire

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5
Q

Medium carbon steel

A

0.3% - 0.5% carbon content

Rod ends, light forgings

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6
Q

High carbon steel

A

0.50% - 1.05% carbon content

Flat springs, coil springs

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7
Q

What type of steel is used extensively in the manufacture of aircraft bolts & nuts?

A

nickel steel

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8
Q

Anti-friction ball & roller bearings are made from _______ steel due to its improved hardness & excellent wear resistant properties.

A

chromium steel

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9
Q

List 2 mechanical properties of chrome nickel steel that makes it suitable for use in manufacture of control cables

A

high strength

corrosion resistant

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10
Q

What are the 2 other names for chrome nickel steel

A

stainless steel

CRES - corrosionn resistant stee;

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11
Q

True or false – Fasteners suited for high temperature applications are usually made from inconel.

A

True

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12
Q

What type of steel is used in the manufacture of spanners?

A

chrome vanadium

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13
Q

Give 2 examples of aircraft components made from chrome molybdenum steel alloy.

A

landing gear structure

engine mounts

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14
Q

What type of metal is widely used in the construction of aircraft structures?

A

aluminium alloy

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15
Q

What is meant by the term “aluminium alloy”

A

pure aluminium mixed with another metal

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16
Q

1XXX
2XXX
5XXX
7XXX

A

Pure aluminium
copper
magnesium
zinc

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17
Q

What is the reason that 1XXX series aluminium is not used in the construction of aircraft structures?

A

Its not strong enough

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18
Q

True of false – 1XXX series has excellent corrosion resistance

A

True

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19
Q

For aircraft structures, what are the most commonly used aluminium alloys in the 2XXX series?

A

2017 and 2024 aluminium alloy

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20
Q

ALCLAD is a type of sheet metal that has ______ (material) rolled over an aluminium alloy core to approximately __% thickness on ___ (both or each) side(s).

A

ALCLAD is a type of sheet metal that has pure aluminium rolled over an aluminium alloy core to approximately 5% thickness on each side(s).

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21
Q

Malleability

A

able to be pressed, pounded or rolled into various shapes without being damaged

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22
Q

Ductility

A

ability to be drawn, bent or twisted into various shapes without being damaged

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23
Q

Hardness

A

ability to resist abrasion, penetration, cutting action or permanent distortion

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24
Q

Brittleness

A

tendency to break or crack without change in shape

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25
Q

Toughness

A

able to resist shearing or tearing

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26
Q

Shear

A

the force of an slicing or cutting an object

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27
Q

compression

A

the force of crushing an object

28
Q

torsion

A

the stress of an object when it is being twisted

29
Q

Tension

A

pulling an object apart

30
Q

What can be achieved by heat treating metals?

A

To change the mechanical properties so the metal will be more useful

31
Q

Heat treatment - Hardening

A

Hardness increases
more brittle

Rapid cooling in quenching medium such as oil, water,

32
Q

Heat treatment -Annealing

A

Produces soft, ductile metal
Relieves internal stresses

Very slow cool down in furnace

33
Q

Heat treatment -Tempering

A

Relieves internal stresses
Reduces Brittleness

Cooldown in still air (outside furnace)

34
Q

Heat treatment -Normalisng

A

Removes internal stresses set up by hear treating, casting, forming, machining

35
Q

True or false: The letter “T” designation is used to indicate the hardness condition of heat treated aluminium alloys.

A

True

36
Q

True of false – Natural ageing process occurs after the soaking step during heat treatment of aluminium alloys.

A

False

37
Q

What is meant by the term “natural ageing”?

A

developing maximum strength

38
Q

Certain aluminium alloys are solution heat treated then followed by a natural ageing process. These alloys are allowed to naturally age (harden) at room temperature over a period of ____ to develop their full properties after heat treatment

A

4 days

39
Q

What heat treatment process would be necessary to avoid cracking of an alloy due to prolonged cold working?

A

annealing

40
Q

Brinell Hardness Tester

A

Forces a hardened spherical ball to indent the metal surface

After test is done, diameter of impression is measured with a calibrated microscope

41
Q

Rockwell hardness tester

A

Forces a conical penetrator to indent the material at a specified load

Test hardness numbers are based on difference between depth of penetration at major and minor loads

42
Q

List 2 problems with the use of cellulose acetate plastics.

A

Tendency to shrink

Slight yellow tint

43
Q

List 2 benefits of acrylic plastics over cellulose acetate plastics.

A

Practically colourless

stiffer than cellulose acetate

44
Q

What is the effect of further addition of heat on thermosetting plastics once they have been fully cured?

A

Further addition of heat on thermosetting plastics can cause deformation or structural weakening

45
Q

What is the definition for a composite material

A

A material that consists of two or more different meterials

46
Q

What are the 2 components that make a strong composite part?

A

fibre, surrounded and held in place by a resin

47
Q

What is the trade name for aramid?

A

kevlar

48
Q

A laminated structure with a core centre is called a _____ structure

A

A sandwich structure is a laminated structure with a core centre

49
Q

What document lists the PPE required to worn when working with composite materials & resins?

A

SDS

50
Q

Hydraulic system pressure: 1500 psi to 3000psi

A

CRES - Corrosion resistant steel

51
Q

Hydraulic system pressure: Pressure up to 1500psi

A

Aluminium alloy

52
Q

Hydraulic system pressure: Pressure above 3000psi

A

Titanium

53
Q

True or false - The sizes for rigid tubing are measured from the inside diameter of the tubing

A

False: Measured from outside

54
Q

Marking decals - Rigid tubing: Blue & yellow background

A

Hydraulic

55
Q

Marking decals - Rigid tubing: Grey background

A

De-icing

56
Q

Marking decals - Rigid tubing: Red background

A

Fuel

57
Q

Marking decals - Rigid tubing: Green background

A

Breathing Oxygen

58
Q

What type of rigid tube fitting is used on fluid systems with: High system pressure

A

Flareless fitting

59
Q

What type of rigid tube fitting is used on fluid systems with: Very low pressure

A

Beaded type fitting

60
Q

Flexible hoses are most suitable for what type of applications?

A

To connect moving parts with stationary parts in locations which are prone to vibration or require a great amount of flexibility.

61
Q

Name the 3 items that make up a flexible hose line.

A

Butyl, Buna - N, Neoprene

62
Q

What is the purpose of a continuous stripe on the outer cover on some flexible hoses?

A

The lay line shows that the hose has been installed without twisting. The line has to be straight.

63
Q

True or false - The sizes for flexible hoses are measured from the outside diameter of the tubing.

A

False: Measured from inside

64
Q

True or False -The swaged end fittings on flexible hoses can be reused

A

False: cannot be reused

65
Q

What is the colour coding for standard hose fitting made of steel & aluminium alloy?

A

AN Steel fitting: Black

AN Aluminium fitting: Blue

66
Q

What is the purpose of fluid line blanks?

A

to prevent the ingress of any contaminants

Cert 2 Mechanical Engineering (2 decks)

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