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Flashcards in Electrical Deck (28):

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

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 instrument 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 markings on the wire


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

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 transmitter


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

determine 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

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



Under what condition must a switch be debated 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


What could cause an AC electric motor run to fast

Excessive applied voltage or shorted field windings


What are the three most common faults that occur in an electrical circuit

Open circuit

Shorted circuit

Low power in circuit


In AC power system how is DC obtained for battery charging

By rectifiers


How long should bonding jumper wires be made

Large enough to handle return current flow and short enough to prevent an increase in resistance


What is a SPDT switch

Single switch, double throw switch


What is meant by flashing the field of a generator

Restoring the residual magnetism to the frame of the generator


What are 3 types of voltage regulators used with aircraft generators

Carbon-pile, solid state and vibrator