Electrical Flashcards
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
Four
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
