CHAPTER 7-AIRFRAME ELECTRICAL SYSTEMS Flashcards Preview

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Flashcards in CHAPTER 7-AIRFRAME ELECTRICAL SYSTEMS Deck (23)
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1
Q

What could cause an AC electric motor to run too fast?

A

Excessive applied voltage or shorted field windings.

2
Q

What too is used to check a motor or generator armature for shorts and opens under load condition?

A

A Growler.

3
Q

When using a Growler, what indication will occur when a short exists between an armature segment?

A

When a metal blade is held over the armature and a short exists in a segment, the blade will begin to vibrate and “chatter.”

4
Q

How is the output voltage of an alternator controlled?

A

By varying the field current that excites the alternator

5
Q

What instruments are used to monitor electrical system loads?

A

Ammeters and voltmeters.

6
Q

How would you identify a specific wire in a wire bundle?

A

By the identification code marked on the wire

7
Q

What tool would you use to determine the size of an unmarked wire?

A

A wire gauge.

8
Q

What color are the navigation lights on the wingtips?

A

The left wingtip is red, the right is green.

9
Q

Name several types of electrical devices that would be considered intermittent loads on an electrical system.

A

Landing gear, cowl and wing flap motors, radio transmitters.

10
Q

Why would it be necessary to analyze an electrical system before increasing the load on the system?

A

To determine that the generator capacity, wire size, and protective device capacity will not be exceeded.

11
Q

What factors should be considered when determining the wire size for a particular application?

A

The system voltage, permissible voltage drop, current to be carried, wire length and whether the load is continuous or intermittent.

12
Q

What is the relation between the inside diameter of a conduit and the outside diameter of wire bundle inside it?

A

The conduit must be 25% larger than the wire bundle.

13
Q

What is the maximum number of terminal lugs that can be placed on a single terminal strip stud?

A

Four

14
Q

What is the proper length for a bonding jumper?

A

As short as practical, but long enough to allow free movement of the component.

15
Q

Under what conditions must a switch be derated from its nominal rating?

A

When used with inductive circuits, circuits with high in-rush current, and with DC motors.

16
Q

At what point do electric motors draw the most current?

A

When starting.

17
Q

Circuit breakers are designed to open before what condition occurs?

A

Before the wire emits smoke.

18
Q

At what point in a circuit should the protective device be located?

A

As close to the power source as possible.

19
Q

What type of circuit breaker may not be used in an aircraft?

A

An automatic resetting type.

20
Q

What part of an aircraft is identified by a white navigation light?

A

The tail.

21
Q

What could cause an AC electric motor to run too slowly?

A

Lack of lubrication, defective wiring, or low applied voltage.

22
Q

What should be done when making bonding or grounding connections between dissimilar materials?

A

Use a suitable washer so that any corrosion will occur on the washer.

AC 43.13-1B

23
Q

Prior to marking a continuity check, what must be done to an electrical circuit?

A

The power must be turned off.