Airframe Electrical Systems Flashcards

1
Q

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

A

Excessive applied voltage or shorted field windings

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2
Q

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

A

A growler

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3
Q

When using a Growler, what indication will occur when a short exist 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”

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4
Q

How is the output voltage of an alternator controlled?

A

By varying the field current that excites the alternator

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5
Q

What instruments are used to monitor electrical system loads?

A

Ammeter and voltmeter

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6
Q

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

A

by the Identification code marked on the wire

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7
Q

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

A

a wire gauge

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8
Q

What color are the navigation lights on the wing tips?

A

the left wingtip is red, the right wing tip is green

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9
Q

Name several types of electrical devices that would be considered intermittent load on an electrical system?

A

Landing gear, cowl and wing flap motors, radio transmitter

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10
Q

why would it be necessary to analyze an electrical system before increasing the loads on the system?

A

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

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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

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12
Q

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

A

the conduit must be 25% larger than the wire bundle

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13
Q

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

A

Four

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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

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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.

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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 a 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 connection between dissimilar material?

A

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

23
Q

prior to making a continuity check, what must be done to an electrical circuit?

A

The power must be turned off