6:11 Electrical Cables And Connectors

Question 1

What is a wire

Answer 1

An isolated single copper conductor surrounded with insulation

Question 2

What is a cable

Answer 2

A group of two or more conductors, with or with out shielding, separately insulated and grouped together by an outer sleeve

Question 3

What is the selection of the correct type of suitable alternative made in accordance with

Answer 3

The aircrafts wiring diagram manuals

Question 4

What is a stranded copper conductor normally used for

Answer 4

Maximum wire flexibility

The strands are tinned, nickel or silver plated

Question 5

What are wires with aluminium conductors are only used for what types of loads

Answer 5

Large loads like galleys for weight saving purposes

Question 6

What type of materials are used for wire insulation

Answer 6

A variety of different materials, all consist of high quality plastics

Question 7

What characteristics must wire and cable insulation have

Answer 7

• Voltage resistant up to 600v
• Resistant to all aircraft fluids
• Highly flexible
• Strong
• Lightweight

Question 8

What are wire types manufactured in accordance with

Answer 8

Military specifications (MIL)

Question 9

Wire types are categorised into different temperature ranges, what are they

Answer 9

• Up to 100/150°c (normal)
• Up to 250°c (high temp)
• Up to 400°c (fire resistant)

Question 10

What are shielded wires

Answer 10

They are used in systems to protect against outside erratic signals and magnetic interference

Question 11

Are shields around single wires or multi conductor cables

Answer 11

Both

Question 12

In signal circuits operating below 50khz, how is maximum protection achieved

Answer 12

By grounding the shield on one side only

Question 13

Shielded ARINC 429 databus is grounded on how many ends

Answer 13

Both ends

Question 14

What are coaxial cables used for

Answer 14

For transmitting high frequency signals only e.g communication transmitter cables

Question 15

Transport of high frequency signals in coax cables are had when…

Answer 15

Both sides are grounded

Question 16

How are coax cables manufactured

Answer 16

With single or stranded cores in a temperature range of -40 to 84°c

Question 17

What requires the manufacturers legend and cable information to be printed on the cable

Answer 17

ISO 2574

Question 18

How frequently must the cable type and information be printed on the outside

Answer 18

Every 150-500mm

Question 19

What type of information must be printed on cables

Answer 19

• Specification (wire type)
• Manufacturer
• Country of origin
• Year of manufacturer
• ## Wire size (AWG)

Question 20

What coloured wire ties do (type s) wires need to be tied with

Answer 20

Pink

Question 21

How much weight and space does Aramaic polyamide save

Answer 21

50% weight and 30% space

Question 22

Other than weight and space saving what other advantage does aromatic polyamide provide

Answer 22

High resistance to temperature

Question 23

What is the biggest disadvantage of aromatic polyamide

Answer 23

Dry arc tracking and wet arc tracking

Question 24

What precautions are done to help prevent carbon arc tracking

Answer 24

• Prevent damaging insulation
• Replace any damaged insulation
• Bend radii should be as large as the circuit allowed
• Strictly forbidden to test with puncture rod

Question 25

What are (EGT)Exhaust gas temperature conductors made from

Answer 25

Alumel and Chromel

Question 26

What must alumel and chromel conductors be repaired with

Answer 26

Alumel with alumel and chromel with chromel

Question 27

What colour are thermocouple wires normally

Answer 27

White and green

Question 28

For fire warning system wires what sort of temperature resistance or range must they have

Answer 28

Normal range up to 400°c with a maximum fire resistance if 1093°c(2000°f) for 5 mins

Question 29

What colour are fire warning insulation wires normally

Answer 29

They are normally red but also can be white

Question 30

What 2 basic groups do connectors get put in to

Answer 30

• Split shell

- Assembled

Question 31

How many types of AN connector are there

Answer 31

6

Question 32

Name all of the AN connectors

Answer 32

Class A - General purpose (solid one piece)
Class B - Back shell separates in to 2 parts
Class C - Pressurised connector
Class D - Moisture and vibration resistant
Class K - Fire proof

Question 33

What are the different AN connectors made from

Answer 33

A,B,C,D - Aluminium

K - Steel

Question 34

What are the most common type of connectors

Answer 34

Assembled

Question 35

What increments do shell size go up in

Answer 35

1/16 inch

Question 36

What does the letter ‘s’ mean in shell sizing

Answer 36

Short housing

Question 37

Where cable identification is denoted in letters what is the order in which they are done

Answer 37

• Upper case
• Lower case
• Double upper case

Question 38

What must unused holes be filled with

Answer 38

Nylon or Teflon plugs

Question 39

Most computers have what to prevent the wrong computer being fitted in to the wrong receptacle

Answer 39

A polarisation key

Question 40

In what sort of areas would you find wire locking

Answer 40

Engines and areas of high vibration

Question 41

What grade of locking wire is commonly used

Answer 41

0.02in/0.5mm corrosion resistant steel wire

Question 42

What is done if a nut needs wire locking but there isn’t another nut to wire lock to

Answer 42

The nut can be wire locked to the structure providing that the safety wire length is less than 5.904in or 15cm