30 Questions
What type of media is used in special communication systems like sonar?
Water
In a communication channel, what is an example of an optical medium?
Fiber-optic cable
Which type of media results in a system known as radio?
Free space
What does a receiver do in a communication system?
Converts transmitted messages for human understanding
Which medium carries long-distance calls and Internet communications today?
Fiber-optic cable
What type of medium carries cable TV signals?
Wire/electrical conductors
What does Fourier analysis tell us about composite signals?
They are a combination of simple sine waves with different frequencies, amplitudes, and phases.
What type of signal is a square wave?
A rectangular signal with equal duration positive and negative alternations.
How is a square wave analyzed according to Fourier analysis?
As a collection of harmonically related sine waves.
What does the factor 4V/π represent in the equation expressing voltage as a function of time for a square wave?
A multiplier for all sine terms.
How many odd harmonics are present in a square wave according to Fourier analysis?
An infinite number
Which statement best describes the composition of a square wave based on Fourier theory?
It comprises simple sine waves at the fundamental frequency and odd harmonics.
What is the frequency range of Extremely High Frequencies (EHF) in the electromagnetic spectrum?
30-300 GHz
Which region of the electromagnetic spectrum includes infrared radiation?
The optical spectrum
How is infrared radiation used in astronomy?
Detect stars and other physical bodies in the universe
What physical equipment can generate infrared radiation, according to the text?
Equipment that generates heat
Which segment of the electromagnetic spectrum comes directly above the millimeter wave region?
Visible spectrum
Where are special coded signals transmitted using infrared radiation?
Wireless LANs
In the context of the electromagnetic spectrum, if the low-frequency limit of channel 2 is 54 MHz and the bandwidth is 6 MHz, what is the upper-frequency limit?
60 MHz
What is the definition of gain in electronic communication circuits?
Amplification ratio of output to input
Based on the example provided, if a power amplifier has a power output of 6 watts (W) with a power gain of 80, what is the input power?
0.075 W
What is the relationship between bandwidth and frequency in a television signal?
Bandwidth determines the range of frequencies in the signal
How is attenuation defined in signal processing circuits?
Reduction in signal strength
What does a higher power gain value indicate in an amplifier circuit?
Greater amplification
What is the formula to calculate the total resultant modulation index when modulating a single carrier with multiple frequencies?
$2mT = m1 + m2 + ...$
What happens in Amplitude Modulation (AM) when a complex wave like voice or video is used as the modulating signal?
A whole range of sidebands are generated
In AM, what type of signal may the carrier and modulating signal be?
Only sine waves
What type of frequencies modulate the carrier in AM when a complex wave is used as the modulating signal?
Frequencies from a whole range
Which scenario generates two sidebands in Amplitude Modulation?
Modulating with a single-frequency sine wave
What is the result of having more than two sine waves of different frequencies modulating a single carrier in AM?
Increased modulation index
Test your knowledge on calculating bandwidth in communication systems. This quiz involves determining the upper-frequency limit based on a given low-frequency limit and bandwidth of a television signal.
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