M6.11 Electrics

Question 1

What is a cable/wire

Answer 1

an isolated single solid conductor, or stranded conductor, surrounded by insulation

Question 2

What are cables normally made of

Answer 2

Copper or aluminium

Question 3

What are the advatantages of aluminium wires

Answer 3

Lightweight
Cheaper

Question 4

What are the advantages of copper wires

Answer 4

Copper can hold a higher current
Aluminium wires cannot go below 8 AWG else they become brittle and crystallise

Question 5

What are the two essential things that a wire has to be

Answer 5

Reliable
Carry a specific load

Question 6

What is wet arc tracking

Answer 6

assessing the resistance to failure of cables when contaminated
Hence why cables lay above pipes that contain fluid

Question 7

How does fluid contamination effect wires

Answer 7

Corrodes the insulation working it’s way to the conductor, slowly working its way up the whole cable

Question 8

What does AWG mean and how does it work

Answer 8

American wire gauge (diameter of the cable)
The bigger the number the smaller the cable
Largest = 0AWG

Question 9

What do we assume that a wires resistance is

Answer 9

0

Question 10

What happens to the resistance if you increase the wire diameter

Answer 10

Resistance decreases

Question 11

What happens to resistance if you increase the length of a wire

Answer 11

Resistance increases

Question 12

What do the last two digits mean on a cable rating identification

Answer 12

The size (AWG)
Copper - AN-10
AL-22

Question 13

Can a single wire or a loom carry for current and why

Answer 13

A single wire
A look has to carry less because of the heat that would be produced, but not able to disparate away

Question 14

Is the voltage drop allowed bigger for a continuous or immediate drop

Answer 14

Voltage allows for an immediate drop is larger.

Question 15

What is the voltage rating on an aircraft

Answer 15

600V

Question 16

What are the three types of cable used on aircraft

Answer 16

Aurcfram
Interconnect
Equipment

Question 17

What is a shielded cable

Answer 17

Has one or more insulated strands that are overlayed with metallic (dielectric) braided shield that
cancels out interference

Question 18

What are high tension cables used for

Answer 18

high voltages for Engine and egnition systems

Question 19

What should you not do after high tension cables have been used

Answer 19

Touch them, wait 10-15 mins for energy to dissipate

Question 20

What are thermocouples made out of

Answer 20

Cromel or alumel

Question 21

How does a thermocouple work

Answer 21

Comprised of two different metals, an electric current will flow through the thermocouple when the two junctions are at different temperatures.

Question 22

What are co axial cables used for

Answer 22

For Radio Frequency (RF) energy which is guided from one point to another

Question 23

How many conductors do co axial cables contain

Answer 23

2 conductors which means they are not as bendy and prevents interference

Question 24

What is the timing for a fire proof cable

Answer 24

15 mins

Question 25

What is the timing for a fire resistant cable

Answer 25

5 mins

Question 26

What is a key way for

Answer 26

To ensure that the cables go on the right connectors

Question 27

What letters are missing on key ways and why are they missing

Answer 27

I, O, Q
Because they can be easily mistaken for numbers

Question 28

What is crimping

Answer 28

a method of firmly attaching a terminal or contact end to an electrical conductor by pressure, forming or reshaping a metal barrel together with the conductor

Question 29

Do more on crimping

Question 30

What does splicing do

Answer 30

the process of joining two or more wires together for repair or modification

Question 31

Do more on splicing