Aircraft Wires and Connectors Flashcards
_____wire has lower resistance than ____ wire for a given wire size and therefore can handle more current.
Solid wire has lower resistance than stranded wire for a given wire size and therefore can handle more current.
Which wire is less susceptible to fatigue due to vibration?
Stranded wires
The term ____, as used in aircraft electrical installations, includes twisted pair, multi-conductor, shielded, and coaxial.
The term cable, as used in aircraft electrical installations, includes twisted pair, multi-conductor, shielded, and coaxial.
What type of cable contains two or more separately insulated conductors in the same jacket.
Multi-conductor cable
What type of cable contains two or more separately insulated conductors twisted together?
Twisted pair cable
What type of cable has one or more insulated conductors covered with a metallic foil or braided shield that provides a barrier against undesirable voltages and interferences?
Shielded cable
What type of cable has a stranded insulated center conductor with a metallic braid outer conductor?
Coaxial cable
What is the purpose of the outer jacket of a shielded cable?
Provides protection against moisture and abrasion
What is the purpose of the metallic foil of a shielded cable?
reduces electromagnetic interference.
Which cable has a dielectric material that insulates the center conductor from the outer conductor?
Coaxial Cable
Wire is manufactured in sizes according to a standard known as the _____. The wire diameters, measured in circular mil, become smaller as the gauge numbers become larger. The largest wire size is number ____, and the smallest is number ___.
Wire is manufactured in sizes according to a standard known as the AWG (American Wire Gauge). The wire diameters, measured in circular mil, become smaller as the gauge numbers become larger. The largest wire size is number 0000, and the smallest is number 40.
The _____ of a wire is a function of the wire’s insulation material and the operating temperature expected for its application.
The voltage rating of a wire is a function of the wire’s insulation material and the operating temperature expected for its application. Wire voltage ratings should never be exceeded.
The number that refers to a wire’s diameter is its _______.
Gauge
What are the three basic electrical characteristics that should be considered when selecting a wire type for a given application?
Wire resistance - determined by the conductor material, its cross-sectional area, conductor length, and temperature.
Wire Current and Voltage Rating - As the environmental temperature increases, the current rating decreases.
Wire Insulation
Wire markings are printed to read horizontally from left to right and vertically from top to bottom. They are placed within ____ inches from each termination and at least every _____ inches throughout the cable segment to assist in wire identification.
Wire markings are printed to read horizontally from left to right and vertically from top to bottom. They are placed within 3 inches from each termination and at least every 15 inches throughout the cable segment to assist in wire identification.
Identify the segments of this wire
2 - The unit number is used to distinguish between wires of two or more identical pieces of equipment installed in the same aircraft – for example, generator #1 and generator #2. The unit number of 2 in the example indicates that the wire is connected to the #2 generator bus.
ARC52 - The second segment may be either an equipment identification code or a circuit function letter. The equipment ID names the specific equipment that serves as the load for this circuit. For example, ARC52 denotes a military airborne UHF radio transceiver.
-46 - The wire number is used to differentiate similar wires in the circuit. Numbers will be one or more digits and, when practical, will occur in numerical sequence.
B - The wire segment letter is used to indicate the difference between wire segments in a particular circuit. The segments are lettered in alphabetical sequence within a particular circuit. Wires with the same circuit function and a common terminal connection or junction have the same wire number but a different alphabetical segment letter.
20 - The wire size number identifies the size (gauge) of the wire. The most common method for measuring wire size is by using the American Wire Gauge (AWG). As you’ve learned, the wire conductor diameter becomes smaller as the gauge number becomes larger.
N - The final identifier is used only when needed. The ground, phase, or thermocouple identifier is used to identify only the wires specific to those circuits. The identification of a wire in other circuits will end at the wire size number. This final identifier will be a single letter, an abbreviation, or blank. If a single letter appears, the wire performs in a power-related or ground function.
Care should be taken that wires are not pinched in cable clamps. Mount the cable clamps directly to structural members. Clamps must be used at least every ____ inches.
Care should be taken that wires are not pinched in cable clamps. Mount the cable clamps directly to structural members. Clamps must be used at least every 24 inches.
A ____ is an electrical fitting containing pin (male), socket (female), or a combination of pin and socket contacts. Each is constructed so that it can be affixed to the end of a cable, conduit, coaxial line, or wire for convenience in joining with a receptacle.
A plug is an electrical fitting containing pin (male), socket (female), or a combination of pin and socket contacts. Each plug is constructed so that it can be affixed to the end of a cable, conduit, coaxial line, or wire for convenience in joining with a receptacle.
A ____ is an electrical fitting containing pin, socket, or pin and socket contacts. It is constructed so that it can be affixed to a bulkhead, chassis, or panel. Usually, it is a fixed or stationary connector assembly and is rarely used inline.
A receptacle is an electrical fitting containing pin, socket, or pin and socket contacts. It is constructed so that it can be affixed to a bulkhead, chassis, or panel. Usually, the receptacle is a fixed or stationary connector assembly and is rarely used inline.
