Question 1

What type of tables show the number of significant side frequencies and the relative amplitudes in each set of side frequencies as well as in the carrier?

Accepted Answer

A) FM spectrum 
B) Bessel 
C) Carson 
D) Zero-carrier 
A) FM spectrum 
B) Bessel 
C) Carson 
D) Zero-carrier B

Question 2

Determining the ____________ is the first step in determining the occupied bandwidth of the modulated carrier.

Accepted Answer

A) frequency-modulated signal 
B) cyclical amplitude variations 
C) modulation index 
D) side-frequency amplitudes 
A) frequency-modulated signal 
B) cyclical amplitude variations 
C) modulation index 
D) side-frequency amplitudes C

Question 3

What mathematical tool is used to solve for the frequency components of the frequency-modulated signal?

Accepted Answer

A) Bessel function 
B) Modulation index 
C) Deviation ratio 
D) Percentage of modulation 
A) Bessel function 
B) Modulation index 
C) Deviation ratio 
D) Percentage of modulation A

Question 4

Which of the following is a drawback to direct FM systems?

Accepted Answer

A) Preserving both the amplitude and frequency characteristics of the intelligence. 
B) Maintaining the frequency stability of the transmitter. 
C) Narrowband FM systems occupy less bandwidth. 
D) Modulation index for FM systems is stable. 
A) Preserving both the amplitude and frequency characteristics of the intelligence. 
B) Maintaining the frequency stability of the transmitter. 
C) Narrowband FM systems occupy less bandwidth. 
D) Modulation index for FM systems is stable.

Question 5

_____________and phase modulation are interrelated.

Accepted Answer

A) Frequency 
B) Bandwidth 
C) Voltage 
D) Intelligence 
A) Frequency 
B) Bandwidth 
C) Voltage 
D) Intelligence

Question 6

___________ always appear in pairs,one above and one below the carrier.

Accepted Answer

A) Side frequencies 
B) Occupied bandwidths 
C) Waveforms 
D) Carrier nulls 
A) Side frequencies 
B) Occupied bandwidths 
C) Waveforms 
D) Carrier nulls

Question 7

Modulation function of a direct-FM transmitter is contained within the ____________.

Accepted Answer

A) microphone 
B) oscillator 
C) sideband 
D) signal 
A) microphone 
B) oscillator 
C) sideband 
D) signal

Question 8

______________ occurs when the modulating signal causes the instantaneous carrier phase,rather than its frequency,to shift from its reference value.

Accepted Answer

A) Angular velocity 
B) Phase shifts 
C) Phase modulation 
D) Rest frequency 
A) Angular velocity 
B) Phase shifts 
C) Phase modulation 
D) Rest frequency

Question 9

Which of the following would be an example a "wideband" FM application?

Accepted Answer

A) Two-way radio 
B) Oscillator 
C) Radio transmitter 
D) Broadcasting 
A) Two-way radio 
B) Oscillator 
C) Radio transmitter 
D) Broadcasting

Question 10

Why would a lightning strike be a concern for AM radios?

Accepted Answer

A) Frequency and phase modulation are interrelated. 
B) Bandwidth is twice the highest intelligence frequency. 
C) AM receiver susceptible to external electrical noise. 
D) Modulation increases the total transmitted power. 
A) Frequency and phase modulation are interrelated. 
B) Bandwidth is twice the highest intelligence frequency. 
C) AM receiver susceptible to external electrical noise. 
D) Modulation increases the total transmitted power.

Question 11

What causes the FM receiver to lock on the stronger signal by suppressing the weaker but can fluctuate back and forth when the two are nearly equal?

Accepted Answer

A) Preemphasis 
B) Deemphasis 
C) Amplification 
D) Capture effect 
A) Preemphasis 
B) Deemphasis 
C) Amplification 
D) Capture effect

Question 12

Which of the following is (are)always equal to twice the highest frequency of the modulating signal,regardless of its amplitude?

Accepted Answer

A) FM bandwidth 
B) Frequency deviation 
C) AM bandwidth 
D) Frequency domains 
A) FM bandwidth 
B) Frequency deviation 
C) AM bandwidth 
D) Frequency domains

Question 13

What is the most important advantage of FM over AM?

Accepted Answer

A) FM is completely insensitive to noise. 
B) FM has superior noise characteristics. 
C) PM signal can be made to look like FM. 
D) Phase modulation (PM) can be used to create FM indirectly. 
A) FM is completely insensitive to noise. 
B) FM has superior noise characteristics. 
C) PM signal can be made to look like FM. 
D) Phase modulation (PM) can be used to create FM indirectly.

Question 14

___________ is used to predict the bandwidth necessary for an FM signal.

Accepted Answer

A) Carson's rule 
B) Ohm's law 
C) Spectrum analysis 
D) Bessel functions 
A) Carson's rule 
B) Ohm's law 
C) Spectrum analysis 
D) Bessel functions

Question 15

What does the AM modulation index measure?

Accepted Answer

A) Modulation depth 
B) Intelligence frequencies 
C) Amplitude variations 
D) Normalized voltages 
A) Modulation depth 
B) Intelligence frequencies 
C) Amplitude variations 
D) Normalized voltages

Question 16

Which of the following describes the maximum deviation permitted by law or regulation?

Accepted Answer

A) FM percentage of modulation 
B) Deviation ratio (DR) 
C) Phase modulation 
D) Angular velocity 
A) FM percentage of modulation 
B) Deviation ratio (DR) 
C) Phase modulation 
D) Angular velocity

Question 17

Why is the capacitor microphone FM generation system seldom used in practical radio-frequency transmission applications?

Accepted Answer

A) It is inherently unstable. 
B) It causes the carrier to shift. 
C) It depends on the amplitude and frequency of the modulating signal. 
D) It is dependent on system design. 
A) It is inherently unstable. 
B) It causes the carrier to shift. 
C) It depends on the amplitude and frequency of the modulating signal. 
D) It is dependent on system design.

Question 18

Almost all FM transmissions provide an artificial boost to the electrical amplitude of the higher frequencies. What is this process called?

Accepted Answer

A) Deemphasis 
B) Capture effect 
C) Noise suppression 
D) Preemphasis 
A) Deemphasis 
B) Capture effect 
C) Noise suppression 
D) Preemphasis

Question 19

All communications systems are constrained by_____________.

Accepted Answer

A) bandwidth availability 
B) reference frequency 
C) sound waves 
D) absence of modulation 
A) bandwidth availability 
B) reference frequency 
C) sound waves 
D) absence of modulation

Question 20

What factor determines the amount of carrier frequency deviation?

Accepted Answer

A) Intelligence frequency 
B) Changing frequency 
C) Frequency components 
D) Intelligence amplitude 
A) Intelligence frequency 
B) Changing frequency 
C) Frequency components 
D) Intelligence amplitude

What type of tables show the number of significant side frequencies and the relative amplitudes in each set of side frequencies as well as in the carrier?

Determining the ____________ is the first step in determining the occupied bandwidth of the modulated carrier.

What mathematical tool is used to solve for the frequency components of the frequency-modulated signal?

Which of the following is a drawback to direct FM systems?

_____________and phase modulation are interrelated.

___________ always appear in pairs,one above and one below the carrier.

Modulation function of a direct-FM transmitter is contained within the ____________.

______________ occurs when the modulating signal causes the instantaneous carrier phase,rather than its frequency,to shift from its reference value.

Which of the following would be an example a "wideband" FM application?

Why would a lightning strike be a concern for AM radios?

What causes the FM receiver to lock on the stronger signal by suppressing the weaker but can fluctuate back and forth when the two are nearly equal?

Which of the following is (are)always equal to twice the highest frequency of the modulating signal,regardless of its amplitude?

What is the most important advantage of FM over AM?

___________ is used to predict the bandwidth necessary for an FM signal.

What does the AM modulation index measure?

Which of the following describes the maximum deviation permitted by law or regulation?

Why is the capacitor microphone FM generation system seldom used in practical radio-frequency transmission applications?

Almost all FM transmissions provide an artificial boost to the electrical amplitude of the higher frequencies. What is this process called?

All communications systems are constrained by_____________.

What factor determines the amount of carrier frequency deviation?

Fundamental Communications Concept

Amplitude Modulation

Communications Circuits

Transmitters

Receivers

Digital Communications Techniques

Digital Modulation and Demodulation

Telephone Networks

Wireless Communications Systems

Computer Communication and the Internet

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Fiber Optics

Filters

Exam 3: Angle Modulation

What type of tables show the number of significant side frequencies and the relative amplitudes in each set of side frequencies as well as in the carrier?

Determining the ____________ is the first step in determining the occupied bandwidth of the modulated carrier.

What mathematical tool is used to solve for the frequency components of the frequency-modulated signal?

Which of the following is a drawback to direct FM systems?

_____________and phase modulation are interrelated.

___________ always appear in pairs,one above and one below the carrier.

Modulation function of a direct-FM transmitter is contained within the ____________.

______________ occurs when the modulating signal causes the instantaneous carrier phase,rather than its frequency,to shift from its reference value.

Which of the following would be an example a "wideband" FM application?

Why would a lightning strike be a concern for AM radios?

What causes the FM receiver to lock on the stronger signal by suppressing the weaker but can fluctuate back and forth when the two are nearly equal?

Which of the following is (are)always equal to twice the highest frequency of the modulating signal,regardless of its amplitude?

What is the most important advantage of FM over AM?

___________ is used to predict the bandwidth necessary for an FM signal.

What does the AM modulation index measure?

Which of the following describes the maximum deviation permitted by law or regulation?

Why is the capacitor microphone FM generation system seldom used in practical radio-frequency transmission applications?

Almost all FM transmissions provide an artificial boost to the electrical amplitude of the higher frequencies. What is this process called?

All communications systems are constrained by_____________.

What factor determines the amount of carrier frequency deviation?

Fundamental Communications Concept

Amplitude Modulation

Communications Circuits

Transmitters

Receivers

Digital Communications Techniques

Digital Modulation and Demodulation

Telephone Networks

Wireless Communications Systems

Computer Communication and the Internet

Transmission Lines

Wave Propagation

Antennas

Waveguides and Radar

Fiber Optics

Filters