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AIRFRAME
J AIRFRAME ELECTRICAL SYSTEMS
| Question | Answer |
|---|---|
| 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 exists 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? | Ammeters and voltmeters. |
| 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 wingtips? | The left wingtip is red, the right is green. |
| Name several types of electrical devices that would be considered intermittent loads on an electrical system. | Landing gear, cowl and wing flap motors, radio transmitters. |
| Why would it be necessary to analyze an electrical system before increasing the load on the system? | To determine that the 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 maximum 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. |
| At what point do electric motors draw the most current? | When starting. |
| Circuit breakers are designed to open before what condition occurs? | Before the wire emits smoke. |
| At what point in a circuit should the protective device be located? | As close to the power source as possible. |
| What type of circuit breaker may not be used in an aircraft? | An automatic resetting type. |
| What part of an aircraft is identified by a white navigation light? | The tail. |
| What could cause an AC electric motor to run too slowly? | Lack of lubrication, defective wiring, or low applied voltage. |
| What should be done when making bonding or grounding connections between dissimilar materials? | Use a suitable washer so that any corrosion will occur on the washer. |
| Prior to making a continuity check, what must be done to an electrical circuit? | The power must be turned off. |
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S_A_J