Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Avionics: Element 3 > Principles > Flashcards

Principles Flashcards

1
Q

What will produce a magnetic field?

A

A current flowing through a conductor.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

When induced currents produce expanding magnetic fields around conductors in a direction that opposes the original magnetic field, this is known as?

A

Lenz’s law.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What determines the field strength of the magnetic field around a conductor?

A

The amount of current.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

They opposition to the creation of magnetic lines of force in a magnetic circuit is know as?

A

Reluctance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Permeability is defined as?

A

The ratio of magnetic flux density in a substance to the magnetizing force that produces it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is meant by the term “back EMF”?

A

A voltage that opposes the applied EMF.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What group of metals are the best low-resistance conductors?

A

Gold, silver, and copper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Good conductors with minimum resistance have what type of electrons?

A

Many free electrons.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What formula would calculate the total inductance of inductors in series?

A

LT = L1 + L2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

How many degrees are there in one complete sine wave cycle?

A

360 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What type of wave is characterized by a rise time significantly faster than the fall time?

A

Sawtooth wave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What type of wave is made up of sine waves of the fundamental frequency and all the odd harmonics?

A

Square

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What type of wave is made up of sine waves at the fundamental frequency and all the harmonics?

A

Sawtooth wave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the basic unit of electrical power?

A

Watt

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What formula would determine the inductive reactance of a coil if frequency and coil inductance are known?

A

XL = 2πfL

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the term used to express the amount of electrical energy stored in an electrostatic field?

A

Joules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

The product of readings of an AC voltmeter and AC ammeter is called:

A

Apparent power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is the term for the out-of-phase power associated with inductors and capacitors?

A

Reactive power

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Which metal object may be least affected by galvanic corrosion when submerged in seawater?

A

Stainless steel propeller shaft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What metal is usually employed as a sacrificial anode for corrosion control purposes?

A

Zinc bar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is the relative dielectric constant for air?

A

1

22
Q

Corrosion resulting from electric current flow between dissimilar metals is called?

A

Galvanic corrosion

23
Q

Which of these will be most useful for insulation at UHF frequencies?

A

Mica

24
Q

Skin effect is the phenomenon where?

A

RF current flows in a thin layer of the conductors, closer to the surface, as frequency increases.

25
Q

How might you reduce the inductance of an antenna coil?

A

Reduce the number of turns.

26
Q

What is the purpose of a bypass capacitor?

A

It removes alternating current by providing a low impedance path to ground.

27
Q

What is the easiest voltage amplitude to measure by viewing a pure sine wave signal on an oscilloscope?

A

Peak-to-peak

28
Q

What is the RMS voltage at a common household electrical power outlet?

A

117-V AC

29
Q

An AC ammeter indicates?

A

Effective (RMS) values of current

30
Q

What is the peak voltage at a common household electrical outlet?

A

165.5 volts

31
Q

By what factor must the voltage of an AC circuit, as indicated on the scale of an AC voltmeter, by multiplied to obtain the peak voltage value?

A

1.414

32
Q

By what factor must the voltage measured in an AC circuit, as indicated on the scale of an AC voltmeter, be multiplied to obtain the average voltage value?

A

0.9

33
Q

What are the 5 common materials of descending conductivity?

A

Silver, copper, aluminum, iron, and lead

34
Q

Halving the cross-sectional area of A conductor will?

A

Double the resistance.

35
Q

What is the term used to identify an AC voltage would cause the same heating in a resistor as a corresponding value of DC voltage?

A

Root mean square (RMS)

36
Q

What happens to receive power in a circuit that has both inductors and capacitors?

A

It alternates between magnetic and electric fields and is not dissipated.

37
Q

Assuming a power source to have a fixed value of internal resistance, maximum power will be transferred to the load when?

A

The load impedance equals the internal impedance of the source.

38
Q

How do you compute true power (power dissipated in the circuit) in a circuit where AC voltage and current are out of phase?

A

Multiply apparent power times the power factor.

39
Q

What is the peak voltage at a common household electrical outlet?

A

165.5 volts

40
Q

What will produce a magnetic field?

A

A current flowing through a conductor.

41
Q

What are the 2 basic types of junction field-effect transistors?

A

N-channel and P-channel

42
Q

MOSFETs are manufactured with THIS protective device from static charges and excessive voltages

A

Zener diode

43
Q

What are the 2 most commonly-used specifications for a junction diode?

A

Maximum forward current and PIV (peak inverse voltage)

44
Q

A common emitter amplifier has?

A

More voltage gain than a common collector

45
Q

How does the input impedance of a field-effect transistor compare with that of a bipolar transistor?

A

A FET has high input impedance; a bipolar transistor has low input impedance.

46
Q

What limits the maximum forward current in a junction diode?

A

The junction temperature

47
Q

How would you calculate the total capacitance of 3 capacitors in parallel?

A

CT=C1+C2+C3

48
Q

The opposition to the creation of magnetic lines of force in a magnetic circuit is known as?

A

Reluctance

49
Q

What is the description of a square wave?

A

A wave that abruptly changes back and forth between 2 voltages levels for equal amounts of time.

50
Q

What is a sine wave?

A

A wave whose amplitude at any given instant can be represented by the projection of a point on a wheel rotating at a uniform speed.

51
Q

What device is used to store electrical energy in an electrostatic field?

A

Capacitor.

52
Q

Which metal object may be least affected by galvanic corrosion when submerged in seawater?

A

Stainless steel propeller shaft.

Avionics: Element 3 (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions