Aircraft Wire
The most common material used to in aircraft wire
Copper
This circuit probably has the highest momentary current draw of any circuit in the aircraft
What is the Starter Motor circuit
Where do you install aircraft wires if they might run parallel and near flammable liquid lines
Always install above the liquid line
This component used Diodes to rectify AC to DC
What is a DC Alternator
An electrically controlled device that opens and closes electrical contacts to effect the operation of other devices in the same or another electrical circuit.
What is a relay
This type of wire material can only be used in larger power feeder type wires
What is aluminum wire
How much gap is allowed between supports before wire bundles must be tied together?
12 inches
What is placed on any structure that allows wire bundles to cross through?
Grommets and clamps
What can cause the diodes of an Alternator to fail?
Reversing the polarity to the diodes while the alternator is operating,
Aircraft Switches should be "Derated" from the nominal rating (amps) for certain circuits such as:
Incandescent lamps (initial current can exceed 15 times the continuous draw)
Inductive Circuits: energy stored in the solenoid or relay coils is released when the control switch is opened and may arc
DC Motors: draw several times their rated current during start, energy stored in the armature and field coils is released when the control switch is opened
The voltage drop in the main power wires from the generation source or the battery to the bus should not exceed
Two percent of the regulated voltage occurs when the generator is carrying its rated current or the battery is being discharged at the 5-minute rate.
Which would have a greater value, the circuit breaker rating (amps) or the continuous current rating for the wire being used?
The wire must be sized to carry the continuous current in excess of the circuit protective device rating
These types of circuit breakers are not used in aviation electrical systems
What are automatic resetting circuit breakers
Switches rated for use at 28 VDC or more, and at 1.0 amp or more, generally have ________ contacts
Silver
This device should not be used as an "Off/On" switch
What is a circuit Breaker
Aircraft wires must be identified properly at intervals of not more than ______
15 inches
Why is the return path of electrical circuits considered negligible?
It is based on the assumption that adequate bonding of the structure or a special electrical current return path has been provided that is capable of carrying the required current with negligible voltage drop
The circuit breaker is there to protect the _____
circuit
Shielding is the process of applying a metallic covering to wiring and equipment to eliminate interference caused by
stray electromagnetic energy.
This type of switch is used to detect the presence of a predetermined "Target" and is referred to as a ___
Proximity Switch
Wires must be replaced when they have been subjected to ______________
chafing, fraying or insulation is suspected of being penetrated.
Wires and cables are supported by suitable clamps, grommets, or other devices at intervals of not more than _________ inches
24, except when contained in a trough, duct or conduit
For the bend radius of wire bundles, the radius must be ______ times greater than the diameter
Wire size less than this size requires special attention due to mechanical strength and installation handling of these wires (vibration,flexing and termination)
size 20 wire
What is used to determine the type of switch used for a specfic operation
The type of load to be controlled and the current ratings
(lamp loads, inductive loads, and motor loads and must be replaced with identical make and model switches )