Aircraft Electrical Systems Flashcards
What controls the output voltage of an alternator?
The generator control unit – GCU
How long should bonding jumper wires be?
A short as practical, but long enough to allow free movement of the component
What factors are considered when selecting wire size for electrical power?
Permissible voltage drop, the system voltage, wire length, current carrying and if the load is continuous or intermittent
How can a particular wire in a bundle be identified?
By the identification code on the wire
What would you use to determine the size of an unmarked wire?
A wire gauge
What size electrical conduit should be used?
25% larger than the maximum diameter of the wire bundle
What should be done to a conduit when fittings are not used?
It should be deburred to prevent insulation damage
What hardware is used to make bonding or grounding connections to a structure of the dissimilar metal?
A washer of suitable material should be use for the corrosion will occur on the washer
How many terminal lugs can be put on a single terminal strip start in an aircraft?
4
When do DC motors draw several times their current rate?
When starting
Why is a circuit breaker designed to be open?
When an overload or circuit fault exists and before the wire emits smoke
What type of circuit breaker should not be used in aircraft?
Automatic reset type circuit breakers
What color is left and right wing tip position light?
Left side is red and right side is green
Where is the white position/navigation light mounted?
On the tail visible from the rear
What could cause an AC electric motor to run too fast?
Excessive applied voltage on shorted fielded windings
What tool is used to check a motor or generator armature for shorts and opens under load conditions?
A growler
When, using a growler, what indication will occur when a short exist between an armature segment?
With a metal blade is held over the armature and short exists in a segment, the blade will begin to vibrate and chatter
How is the output voltage of an alternator controlled?
By varying the current field that exits the alternator
What instruments are used to monitor electrical system loads?
Ammeter and voltmeters
Why would it be necessary to analyze electrical system before increasing the load on the system?
To determine the generator capacity, wire size and to not exceed the protective device capacity
Name several types of electrical devices that would be considered intermittent loads on the electrical system
Landing gear, Cowl and wing flap motors, radio, transmitters
Under what conditions must a switch be derated from its nominal rating?
When used with inductive circuits, circuits with a high in-rush current, and with DC motors
At what point in a circuit should the protective device be located?
As close to the source as possible
What can cause an AC electric motor to run too slowly?
Lack of lubrication, defective wiring or low-voltage
Prior to making a continuity check what must be done to the electrical circuit?
The power must be turned off
