AS112 - Homework - Day 2 Flashcards
When an aircraft is fueled, it should be electrically connected to the fuel truck and to the ground to prevent a spark caused by an accumulation of ___ electricity on the aircraft surface.
static
A body having an accumulation of electrons on its surface is said to have a ____.
negative
Like charges ____ each other.Unlike charges _____ each other.
Answer 1:
repel
Answer 2:
attract
Static dischargers on an aircraft control surface provide sharp points from which a static charge can be dissipated from the control surface into the
air
Flexible metal braids called _____ straps connect the control surfaces to the aircraft structure to prevent the buildup of static charges.
Answer 1:
bonding
The ease with which lines of magnetic flux can pass through a material is known as a _________ material’s .
Answer 1:
permeability
is the opposition to the flow of magnetic force.
reluctance
One line of magnetic flux is called a .
Maxwell
One _____ represents a magnetic flux density of one maxwell per square centimeter.
gauss
is the ability of a material to retain magnetism after a magnetizing force is removed.
Answer 1:
retentivity
______ magnetism is the magnetism remaining in a material after the magnetizing force has been removed.
residual
The lines of magnetic flux are considered to leave the [ Select ] pole of a magnet and enter at the [ Select ] pole.
Answer 1:
north
Answer 2:
south
The strength of an electromagnet is determined by the
[ Select ] and by the
[ Select ] flowing through it.
Answer 1:
number of turns
Answer 2:
amount of current
Using a soft iron core in an electromagnet increases its strength because it ________ the lines of flux.
concentrates
There are two types of electromagnets used in practical applications, those having ______ cores and those having ______cores. (alphabetical)
Answer 1:
fixed
Answer 2:
movable
Name five ways electrical energy may be generated (alphabetical)
Answer 1:
Chemical
Answer 2:
Light
Answer 3:
Magnetism
Answer 4:
Pressure
Answer 5:
Thermal
If three amps of current are flowing in a 12-volt circuit, how much resistance is present? ohms
4
When a five-ohm resistance is placed in a 20-volt circuit, how much current will flow? amps
Answer 1:
4
A 60-watt light bulb installed in a 24-volt circuit will cause how much current to flow? amps
Answer 1:
2.5
What is the total power and total current for a 12-volt aircraft system with the following equipment installed: (parallel)
a. Navigation lights, 3 lights at 20 watts each = amps
b. Radio 1, 60 watts = amps
c. Radio 2, 30 watts = amps
d. Interior lights, 30 watts = amps
Total power = watts
Total current = amps
Answer 1:
5
Answer 2:
5
Answer 3:
2.5
Answer 4:
2.5
Answer 5:
180
Answer 6:
15
How many watts of electrical power are needed to lift a 12,000-pound aircraft three feet in one minute?
horsepower is needed (two decimals)
watts of electrical power (one decimal)
Answer 1:
1.09
Answer 2:
813.8
How much current is required for a 12-volt DC electric motor to produce 1/4 horsepower if we assume that there are no losses in the system?
1/4 horsepower = watts (round 1 decimal)
In a 12-volt motor this will require amps (round 1 decimal)
Answer 1:
186.5
Answer 2:
15.54
Name the three components needed to complete an electrical circuit.
Load
Source
Conductor
The resistance of a conductor is affected by what three factors?
physical characteristics
temperature
dimensions
A material is said to have a positive temperature coefficient of resistance if its resistance ____as its temperature increases.
Answer 1:
increases
According to the wire chart illustrated in figure 3-33 on page 3-16 of your Jeppesen General textbook, a six-gauge MIL-W-7072 aluminum wire will carry [ Select ] amps in free air, and a six-gauge MIL-W-5086 copper wire will carry [ Select ] amps in free air. The reason for the difference is that copper has
[ Select ] resistance than the aluminum.
Answer 1:
83
Answer 2:
101
Answer 3:
less
A DPDT switch will control __ circuits, and it has either __ or __ positions.
Answer 1:
2
Answer 2:
2
Answer 3:
3
An electromagnetic switch having a movable core is called a .
Answer 1:
solenoid
A glass tubular fuse that uses a small spring to pull the fusible link apart is called a ______ ________ fuse.
Answer 1:
Slow Blow
