Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

power points for ati > Amplitude Modulation (AM) > Flashcards

Amplitude Modulation (AM) Flashcards

(77 cards)

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

What does AM stand for?

A

Amplitude Modulation

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

True or False: In amplitude modulation, the amplitude of the carrier wave is varied in accordance with the message signal.

A

True

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

What type of wave is primarily used as a carrier wave in AM?

A

Sine wave

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

Fill in the blank: The frequency of the carrier wave in AM remains _____ while the amplitude varies.

A

Constant

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

What is the main purpose of amplitude modulation?

A

To encode information in a carrier wave for transmission.

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

Which component is essential in the demodulation process of AM signals?

A

Envelope detector

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

Multiple Choice: Which of the following is a disadvantage of AM?

A

It is more susceptible to noise.

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

What is the typical bandwidth requirement for an AM signal?

A

Twice the highest frequency of the modulating signal.

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

True or False: AM is commonly used for broadcasting radio signals.

A

True

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

In AM, what does the term ‘modulation index’ refer to?

A

The ratio of the peak amplitude of the modulating signal to the peak amplitude of the carrier wave.

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

What is the formula for calculating the modulation index (m)?

A

m = Am / Ac, where Am is the peak amplitude of the modulating signal and Ac is the peak amplitude of the carrier.

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

In AM, what happens to the carrier signal when the modulating signal is at its maximum amplitude?

A

The amplitude of the carrier signal is at its peak.

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

Fill in the blank: An increase in the modulation index results in a wider _____ of the AM signal.

A

Bandwidth

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

What is the effect of over-modulation in AM?

A

It causes distortion and can lead to signal clipping.

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

True or False: AM signals can be transmitted over long distances.

A

True

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

What is typically used to amplify AM signals?

A

RF amplifiers

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

Multiple Choice: Which of the following is a common application of AM?

A

AM radio broadcasting

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

What is the term for the unwanted signals that can interfere with AM transmission?

A

Noise

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

Fill in the blank: The process of converting an AM signal back to its original modulating signal is called _____

A

Demodulation

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

What type of modulation is AM compared to?

A

Frequency Modulation (FM)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

True or False: AM is more efficient in terms of power usage than FM.

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What is the relationship between frequency and amplitude in AM?

A

The frequency remains constant while the amplitude varies.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What type of receiver is used for AM radio?

A

Superheterodyne receiver

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Fill in the blank: In AM, the carrier frequency is _____ than the highest frequency of the modulating signal.
Higher
26
What is 'double sideband amplitude modulation' (DSBAM)?
A form of AM where both upper and lower sidebands are transmitted.
27
What is the significance of the sidebands in AM?
They contain the actual information of the modulating signal.
28
Multiple Choice: Which type of AM uses only one sideband?
Single Sideband Modulation (SSB)
29
True or False: AM signals require more bandwidth than FM signals.
False
30
What is the primary advantage of Single Sideband Modulation (SSB) over AM?
It is more bandwidth-efficient.
31
Fill in the blank: The term 'carrier suppression' refers to the elimination of the _____ in SSB transmission.
Carrier signal
32
In AM, what is the effect of increasing the modulating frequency?
It increases the bandwidth of the AM signal.
33
What does the term 'intermodulation distortion' refer to in AM?
Distortion that occurs when two or more signals interact.
34
True or False: AM can be effectively used for data transmission.
True
35
What are the two main components of an AM signal?
Carrier wave and modulating signal.
36
Fill in the blank: AM radio typically operates in the _____ frequency range.
Medium
37
Which modulation technique is more resistant to noise, AM or FM?
FM
38
What does 'modulation depth' indicate in AM?
The degree to which the carrier signal is varied.
39
True or False: The envelope of an AM signal represents the modulating signal.
True
40
What is the primary disadvantage of using AM for audio broadcasting?
It is more susceptible to interference and noise.
41
Fill in the blank: The process of mixing a modulating signal with a carrier wave is called _____
Modulation
42
What is a common example of a modulating signal in AM?
Audio signal
43
Multiple Choice: Which of the following is a characteristic of AM?
Amplitude varies with the modulating signal.
44
What is the primary purpose of an AM transmitter?
To convert audio signals into AM radio waves for transmission.
45
True or False: AM is used for both voice and music signals.
True
46
What does the term 'carrier frequency' refer to in AM?
The frequency of the unmodulated carrier wave.
47
Fill in the blank: The range of frequencies occupied by an AM signal is called its _____
Bandwidth
48
What happens to the amplitude of the carrier wave during modulation?
It varies in accordance with the modulating signal.
49
Multiple Choice: What is the result of poor modulation in AM?
Weak signal strength.
50
True or False: AM can be used for two-way communication.
True
51
What is the role of a modulator in AM transmission?
To combine the modulating signal with the carrier wave.
52
Fill in the blank: The term 'sideband' refers to the _____ frequencies created by modulation.
Additional
53
What is the main challenge when receiving AM signals?
Dealing with atmospheric noise and interference.
54
True or False: AM can provide higher audio quality than FM.
False
55
What is the significance of the upper and lower sidebands in AM?
They carry the information of the modulating signal.
56
Multiple Choice: Which of the following is a method to improve AM signal quality?
Using a better antenna.
57
What is the typical audio frequency range for AM broadcasting?
300 Hz to 5 kHz
58
Fill in the blank: The term 'modulated signal' refers to the _____ wave that contains the information.
AM
59
True or False: The carrier frequency is the only frequency transmitted in AM.
False
60
What is the difference between DSBAM and SSB?
DSBAM transmits both sidebands, while SSB transmits only one.
61
What does the term 'envelope' refer to in AM signals?
The outer shape representing the amplitude variation of the signal.
62
Fill in the blank: AM signals are typically more affected by _____ than FM signals.
Noise
63
What is the purpose of a filter in AM receivers?
To isolate the desired frequency from other signals.
64
True or False: AM technology is outdated and not used in modern communication.
False
65
What is the primary factor that affects the range of AM transmission?
Transmission power and frequency.
66
Fill in the blank: The term 'carrier recovery' refers to the process of _____ in AM demodulation.
Extracting the carrier wave
67
What is the main advantage of AM in terms of transmitter design?
Simplicity and cost-effectiveness.
68
Multiple Choice: In which application is AM commonly used?
Public radio broadcasting.
69
True or False: AM signals can be affected by physical obstacles.
True
70
What does the term 'frequency response' refer to in the context of AM?
The range of frequencies that an AM system can effectively transmit.
71
Fill in the blank: The modulation process in AM can be visualized as varying the _____ of a wave.
Height
72
What is the relationship between the modulation index and signal distortion in AM?
Higher modulation index can lead to increased distortion.
73
What is the effect of atmospheric conditions on AM transmission?
They can cause signal fading and interference.
74
True or False: AM is less efficient in power usage compared to digital modulation techniques.
True
75
What is the role of AGC (Automatic Gain Control) in AM receivers?
To stabilize the output level of the received signal.
76
Fill in the blank: AM signals can be transmitted over _____ distances compared to FM.
Longer
77
What is the main disadvantage of using AM in high-frequency applications?
Limited bandwidth and susceptibility to noise.

power points for ati (179 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions