Airframe Electrical Systems Flashcards
What could cause an AC electric motor to run too fast?
Excessive applied voltage or shorted field 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?
When a metal blade is held over the armature and a 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 field current that excites the alternator
What instruments are used to monitor electrical system loads?
Ammeter and voltmeter
how would you identify a specific wire in a wire bundle?
by the Identification code marked on the wire
What tool would you use to determine the size of an unmarked wire?
a wire gauge
What color are the navigation lights on the wing tips?
the left wingtip is red, the right wing tip is green
Name several types of electrical devices that would be considered intermittent load on an electrical system?
Landing gear, cowl and wing flap motors, radio transmitter
why would it be necessary to analyze an electrical system before increasing the loads on the system?
To determine that generator capacity, wire size, and protective device capacity will not be exceeded
What factors should be considered when determining the wire size for a particular application?
The system voltage, permissible voltage drop, current to be carried, wire length and whether the load is continuous or intermittent
what is the relationship between the inside diameter of a conduit and the outside diameter of the wire bundle inside it?
the conduit must be 25% larger than the wire bundle
What is the max number of terminal lugs that can be placed on a single terminal strip stud?
Four
What is the proper length for a bonding jumper?
As short as practical , but long enough to allow free movement of the component
Under what conditions must a switch be derated from its nominal rating?
When used with inductive circuits, circuits with high in rush current, and with DC motors.