Jeppesen Oral- Chapter 7 ( Airframe Electrical Systems )

Question 1

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

Answer 1

Excessive applied voltage or shorted field windings

Question 2

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

Answer 2

Growler

Question 3

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

Answer 3

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

Question 4

How is the output voltage of an alternator controlled?

Answer 4

By varying the field current that excites the alternator

Question 5

What instruments are used to monitor electrical system loads?

Answer 5

Ammeters and voltmeters

Question 6

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

Answer 6

By identification marking on the wire

Question 7

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

Answer 7

Wire gauge

Question 8

What color are the navigation lights on the wingtips?

Answer 8

Left red, right is green

Question 9

Name several types of electrical deceives that would be considered intermittent loads on an electrical system?

Answer 9

Landing gear, cowl and wing flap motors and radios

Question 10

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

Answer 10

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

Question 11

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

Answer 11

The system voltage permissible voltage drop, current to be carried, wire length and the load schedule

Question 12

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

Answer 12

The conduit must be 25% larger than the wire bundle

Question 13

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

Answer 13

four

Question 14

What is the proper length for a bonding jumper?

Answer 14

As short as possible but long enoguh to allow free movement of component

Question 15

Under what conditions must a switch be de-rated from its nominal rating?

Answer 15

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

Question 16

St what point do electric motors draw the most current ?

Answer 16

When starting

Question 17

Circuit breakers are designed to open before what condition occurs?

Answer 17

Before wire emits white smoke

Question 18

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

Answer 18

As close to the power source as possible

Question 19

What type of circut breaker may not be used in aircraft?

Answer 19

Automatic resetting

Question 20

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

Answer 20

Tail

Question 21

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

Answer 21

Lack of lubrication, defective wiring or low applied votlage

Question 22

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

Answer 22

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

Question 23

Prior to making a continuity check, what must be done to the electrical circuit?

Answer 23

Power must be switched off