Electrical
Why is stranded wire used rather than solid wire in most powerplant electrical systems? - correct answer
✔✔Solid wire is likely to break when it is subjected to vibration.
What two things must be considered in selection of wire size when making an electrical installation in an
aircraft? - correct answer ✔✔The current-carrying capability of the wire and the amount of voltage drop
that is caused by current flowing through the wire.
Why are the wires in certain electrical installations twisted together? - correct answer ✔✔By twisting
the wires together, the magnetic fields caused by current flowing in the wires are minimized.
What is used to protect a wire bundle from chafing where it passes through a hole in a bulkhead or
frame? - correct answer ✔✔A grommet around the edges of the hole.
How are electrical wires protected where they pass through an area of high temperature? - correct
answer ✔✔Wires passing through these areas are insulated with high temperature insulation, and the
wires are enclosed in some type of protective conduit.
What is the minimum separation that is allowed between a wire bundle and a fluid line that carries
combustible fluid or oxygen? - correct answer ✔✔A minimum of six inches.
What is the significance of the color of the solderless connectors that are used on electrical wires? -
correct answer ✔✔The color of the insulation indicates the size of wire the connector will fit. Red
terminals fit 22- through 18-gage wire, blue terminals fit 16- and 14-gage wire, and yellow terminals fit
12- and 10-gage wire.
What is the maximum number of wire terminals that may be stacked on a single stud in a terminal strip?
- correct answer ✔✔Four.
Why is stranded wire used rather than solid wire in most powerplant electrical systems? - correct answer
✔✔Solid wire is likely to break when it is subjected to vibration.
What two things must be considered in selection of wire size when making an electrical installation in an
aircraft? - correct answer ✔✔The current-carrying capability of the wire and the amount of voltage drop
that is caused by current flowing through the wire.
Why are the wires in certain electrical installations twisted together? - correct answer ✔✔By twisting
the wires together, the magnetic fields caused by current flowing in the wires are minimized.
What is used to protect a wire bundle from chafing where it passes through a hole in a bulkhead or
frame? - correct answer ✔✔A grommet around the edges of the hole.
How are electrical wires protected where they pass through an area of high temperature? - correct
answer ✔✔Wires passing through these areas are insulated with high temperature insulation, and the
wires are enclosed in some type of protective conduit.
What is the minimum separation that is allowed between a wire bundle and a fluid line that carries
combustible fluid or oxygen? - correct answer ✔✔A minimum of six inches.
What is the significance of the color of the solderless connectors that are used on electrical wires? -
correct answer ✔✔The color of the insulation indicates the size of wire the connector will fit. Red
terminals fit 22- through 18-gage wire, blue terminals fit 16- and 14-gage wire, and yellow terminals fit
12- and 10-gage wire.
What is the maximum number of wire terminals that may be stacked on a single stud in a terminal strip?
- correct answer ✔✔Four.
