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Power Plant > Electrical Wiring > Flashcards

Electrical Wiring Flashcards

1
Q

The 3 materials that most aircraft wirings are coated with

A
  1. Tin 2. Nickel 3. Silver
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2
Q

Most common insulation material for aircraft wires

A

Teflon

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3
Q

2 disadvantages of aluminum wiring

A
  1. Crystalizes when subjected to high vibration 2. Can only carry 2/3 of the current that the same gauge of copper wire can
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4
Q

What to do when the sistuation calls for a replacement of a copper wire with an aluminum wire

A

Always to replace a copper wire with an aluminum wire that is 2 wire gauges greater than copper

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5
Q

The standard system for measuring wire gauges

A

American wire gauge (AWG)

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6
Q

The typical smallest wire gauge used on aircraft

A

22 gauge wire

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7
Q

3 factors affecting how much current a wire is capable of of carrying

A
  1. Cross sectional area 2. Conductive material 3. Length of wire
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8
Q

The system of How the cross sectional area of a wire is expressed in

A

Circular mill

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9
Q

One circular mil is equal to ______ inches

A

0.001 inches

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10
Q

The method for finding the cross sectional area of a round conductor in circular mils

A

Square the diameter Multiply the diameter by itself

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11
Q

The location for where square mills wires are used

A

Bus bar connections

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12
Q

The 3 factors that need to be considered for when choosing a wire to install

A
  1. System voltage 2. Allowable voltage drop 3. Duty cycle
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13
Q

Indentiiciation markings on wires are required to be labeled every ____ to _____ inches along the wire

A

12-15 inches along the wire

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14
Q

The 2 ways that electrical wires may be installed on aircraft

A
  1. Open 2. In a conduit
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15
Q

Rule with in regards to wire bundle installation and main and back up systems

A

No single bundle should contain wires for both main and back up systems

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16
Q

Once the wires in a bundle are assembled, the knots should be tied every

A

Knots on wire bundles should be tied every 4 inches

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17
Q

The type of material used to tie knots on wire bundles

A

Nylon

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18
Q

The two knots and the sequence in which the knots are tied for electrical wire bundles

A

Close hitch followed by a square knot

19
Q

Wire bundles should be at least _____ inches away from any control cable

A

3 inches

20
Q

What helps prevent wires from being damaged by fluids that leaks into low areas

A

Installing wires on the side walls or overhead prevents

21
Q

The standard rule for when installing electrical wires parallel to oxygen lines or fluid lines

A

Install wires 6 inches above fluid or oxygen lines

22
Q

Installing electrical wire at a heigh of 6 inches only deals with _____ lines and ______ lines

A

Oxygen, fluid

23
Q

Any bundle that passes through a bulkhead should be

A

Clamped to a bracket

24
Q

If less that a 1/4 inch clearance exists between the bundle and the bulkhead hole, this must be done

A

Rubber grommet must be installed when

25
Q

A rubber Gromet must be installed on a wire bundle when

A

1/4 inc clearance exhaust between the bundle and the bulkhead

26
Q

When electrical wire bundles must make a bend, the good practice is to use a bend radius which is

A

10 times the bundle diameter

27
Q

The inside diameter of the conduit must be ______ than the _______ of the wire bundle

A

inside diameter of the conduit must be 25% larger than wire bundles maximum diameter

28
Q

The means of securing conduits in aircraft

A

Conduits are secured with clamps

29
Q

The method of protecting aircraft instrumentation from the magnetic field developed by open wires or wires in conduits

A

Shielding method

30
Q

The reason why a two-conductor twisted wire would be used to carry current to and from a light that illuminates the compass card

A

A way of canceling the magnetic field produced by the wire, carrying a current

31
Q

The term for intercepting electrical energy and shunting it to an electrical ground

A

Shielding

32
Q

The two metals used to shield electrical wires

A
  1. tin 2. cadmium
33
Q
A

10-12 gauge color

34
Q
A

14-16 gauge collor

35
Q
A

18-22 gauge color

36
Q
A

Hook terminal

37
Q
A

Slotted terminal

38
Q

The type of corrosion that can occur at terminal/ wire junction

A

Galvanic corrosion

39
Q

The type of wire/ conductive material that requires special attention when, stripping and attaching a terminal to it

A

Aluminium wire

40
Q

The FAA prefered crimping tool for wires and terminals

A

Racheting-type crimping tool

41
Q

What is required of a racheting-type crimping tool being that it is considered a precission instrument

A

Caibrated

42
Q
A

Conduit

43
Q
A
  1. conductor
  2. primary insulation
  3. shielding
  4. external jacket

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