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Mod 6 > 6.11 > Flashcards

6.11 Flashcards

1
Q

What is the definition of a wire?

A

An isolated single conductor surrounded by insulation

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2
Q

What is the definition of a cable?

A

A group of two or more conductors

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3
Q

When is aluminium conductor used?

A

For large loads to save weight

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4
Q

What are the three different categories of wires?

A
  • normal
  • high temperature
  • fire resistant
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5
Q

What temperature do normal wires cover?

A

Up to 150°C

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6
Q

What temperature do high temperature wires go up to?

A

Up to 250°C

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7
Q

What temperature do fire resistant wires go up to?

A

Up to 400°C

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8
Q

When are shielded wires used?

A

To protect against any outside erratic signals or magnetic interference

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9
Q

Where is the shielded wire grounded if it is below 50KHz?

A

At one end

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10
Q

Why is ARINC 429 data bus different?

A

It is grounded on both ends

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11
Q

When are coaxial cables used?

A

To transport high frequency signals

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12
Q

What side is grounded on coaxial cables?

A

Both sides

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13
Q

What is printed on a wire or a cable?

A

It’s part number

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14
Q

What does class mean in a wiring material specification?

A

The amount of insulated wire in the cable

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15
Q

How often is the print on a wire replicated?

A

150-500mm

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16
Q

What does wire identification markings contain?

A

A combination of numbers and letters to show what circuit it belongs to

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17
Q

Where can wire size and other information on that wire be found?

A

A wiring diagram

18
Q

If wire and cable marking cannot be completed without insulation damage, what should be used?

A

Insulation tubing printing

19
Q

When is vertical printing used?

A

The wire is very small or thin insulation

20
Q

Why is aromatic polyamide insulation used?

A

It saves 50% weight and 30% space and high temperature resistance

21
Q

How does dry carbon arc tracking work?

A

A build up of carbon from damaged insulation which then can have the ability to short circuit

22
Q

How does wet carbon arc tracking work?

A

When a breakdown of insulation gets contaminated with fluid causing a short circuit

23
Q

What is the temperature range of a fire warning wire?

A

Up to 400°C with a fire resistance of 1,093°C for 5 minutes

24
Q

What colour are fire warning wires?

A

Normally red but can be white

25
Q

How do you decide to install pins or sockets at a connector?

A

By establishing which side is live

26
Q

Why is the live side of a connector normally have socket type contacts?

A

To minimise the risk of electrical shock

27
Q

What are the two types of connectors?

A

Split shell and assembled construction

28
Q

What are split shell connectors made from?

A

Aluminium

29
Q

Why are class K split shell connectors special?

A

They’re fireproof connectors made from steel

30
Q

What comes separate when ordering an assembled connector?

A

The backing clamp

31
Q

What is the job of a back shell in a connector?

A

To provide support for the wires

32
Q

Where is the master key-way located if a connectors is installed on the horizontal axis?

A

At the top

33
Q

Where is the master key-way located if a connectors is installed on the vertical axis?

A

Forward in relation to the aircraft

34
Q

How are the connector contacts denoted?

A

By letters, numbers, or combination of both

35
Q

How are connector contacts layer outed?

A

Starting at the centre and spiralling anti-clockwise outwards

36
Q

When denoting connector contacts with letters what is the order when you have more than 24?

A
  • upper case letters
  • lower case letters
  • double upper case letters
37
Q

When numbers or letters are removed to prevent confusion in connector contacts, what is done?

A

It is marked by a small slash

38
Q

If a connector contact is not used what must happen?

A

It must be filled with nylon or Teflon seal plugs

39
Q

When are polarisation keys used?

A

When preventing the wrong computer being inserted into a shelf

40
Q

When must non self-locking threaded couplings be wire locked?

A

In areas inaccessible for regular maintenance inspections and high vibration areas

41
Q

What size locking wire must be used to safety an electrical connector?

A

0.5mm

Mod 6 (17 decks)

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