WorksheetsCommunication Systems Quiz
Total questions: 55
Worksheet time: 41mins
What are the three basic components of a communication system?
Transmitter, antenna, and receiver
Encoder, decoder, and channel
Transmitter, channel or medium, and receiver
Microphone, amplifier, and speaker
What is a communication channel?
A device that converts an electrical signal into a signal suitable for transmission.
A collection of electronic components that accepts a transmitted message.
A random, undesirable electronic energy that interferes with a message.
The medium by which an electronic signal is sent from one place to another.
Which of the following is NOT listed as a type of electronic communication in the provided chapter?
Simplex
Half duplex
Triplex
Full duplex
A one-way electronic communication, such as a radio or TV broadcast, is referred to as what?
Duplex
Half duplex
Simplex
Broadband
What is a transceiver?
A device that transmits signals only.
A device that receives signals only.
An electronic unit that incorporates circuits that both send and receive signals.
A component that converts an analog signal to a digital one.
What is the process of allowing two or more signals to share the same medium or channel called?
Modulation
Demodulation
Multiplexing
Attenuation
What is a modem?
A device that amplifies signals.
A device that modulates a high-frequency carrier signal.
A device that translates data from digital to analog and back again.
A device that removes noise from a signal.
Which of the following is an example of a full-duplex communication system?
Radio broadcasting
Paging services
A telephone
Citizen band (CB) radio
What is a digital signal?
A smoothly and continuously varying voltage or current.
A signal that is degraded by noise.
A signal that changes in steps or discrete increments.
A high-frequency signal modulated by audio, video, or data.
What is the primary use of ultraviolet waves mentioned in the text?
Communication
Astronomy
Weapons systems
Medical
What does modulation do to an information signal?
It separates the signal into segments.
It recovers the original signal from the carrier.
It makes the signal more compatible with the medium.
It allows multiple signals to share the same channel.
Which type of multiplexing involves using a unique binary code to transmit multiple signals on the same frequency?
Frequency-division multiplexing
Time-division multiplexing
Code-division multiplexing
Wavelength-division multiplexing
What is the unit of measurement for frequency?
Meters
Hertz (Hz)
Cycles per meter
Decibels (dB)
What is the process of recovering the original baseband signal from a modulated carrier in a receiver called?
Modulation
Multiplexing
Demodulation
Attenuation
What is the range of the Very High Frequencies (VHF) band?
3-30 MHz
30-300 MHz
300-3000 kHz
300-3000 MHz
What is the definition of wavelength?
The number of cycles of a repetitive wave in a given period.
The distance a signal can travel before being attenuated.
The distance occupied by one cycle of a wave.
The speed of light divided by the frequency.
What is the electromagnetic spectrum?
The range of frequencies from 30 Hz to 300 GHz.
A collection of oscillators, amplifiers, and filters.
The range of electromagnetic signals encompassing all frequencies.
The bandwidth occupied by a communication channel.
Which of the following is an example of an analog signal?
Morse code
Serial binary code
A sine wave
Telegraph signals
What is the primary purpose of multiplexing?
To recover the original intelligence signal.
To convert digital data to analog.
To amplify the signal for transmission.
To allow two or more signals to share the same medium or channel.
What is the function of a demodulator in a receiver?
To amplify the received signal.
To mix frequencies.
To recover the original intelligence signal from the modulated carrier.
To generate a high-frequency carrier wave.
Which of the following is a key characteristic of half-duplex communication?
Both parties can talk and listen simultaneously.
It is a one-way transmission.
Only one party can transmit at a time.
It is only used for analog signals.
What is the main purpose of "spectrum management"?
To increase the bandwidth of a signal.
To prevent signal attenuation.
To develop new communication techniques.
To control the use of the electromagnetic spectrum.
What is the relationship between frequency and wavelength?
They are directly proportional.
Wavelength is the square of the frequency.
They are inversely proportional.
Frequency is measured in meters, and wavelength is in Hertz.
Which type of modulation involves varying the frequency of a high-frequency carrier signal?
Amplitude modulation (AM)
Frequency modulation (FM)
Phase modulation (PM)
Frequency-shift keying (FSK)
What is the purpose of a filter in a transmitter or receiver?
To mix frequencies.
To modulate the signal.
To amplify the signal.
To tune circuits and remove unwanted frequencies.
What is "Baseband transmission"?
When a carrier signal is modulated, amplified, and sent to an antenna.
When information is sent directly and unmodified over the medium.
When digital signals are converted to analog form.
The process of multiplexing multiple signals together.
What is the definition of "gain" in an electronic circuit?
The loss introduced by a circuit or component.
The ratio of a circuit's input to its output.
The ratio of a circuit's output to its input.
A measure of the circuit's resistance.
A circuit has an input power of 20 mW and an output power of 100 mW. What is the power gain?
0.2
50
2000
5
When two or more stages are connected together in a circuit, it is referred to as being:
Modulated
Amplified
Cascaded
Filtered
What is the overall gain of three cascaded amplifiers with individual gains of 10, 5, and 2?
17
20
100
1000
What does "attenuation" refer to?
An increase in signal amplitude.
The amplification of a signal.
A gain that is greater than 1.
A loss introduced by a circuit or component.
What is the voltage attenuation of a circuit if the input voltage is 5 V and the output voltage is 2 V?
2.5
10
0.5
0.4
What is the voltage attenuation of a circuit if the input voltage is 5 V and the output voltage is 2 V?
2.5
10
0.5
0.4
A circuit that has attenuation has a gain that is
Equal to 1
Greater than 1
Less than 1
Equal to 0
How is the total attenuation of cascaded circuits calculated?
By adding the individual attenuations.
By subtracting the smallest attenuation from the largest.
By dividing the first attenuation by the last.
By multiplying the individual attenuations.
A circuit has a voltage input of 10 V. It passes through two cascaded stages with attenuations of 0.5 and 0.2. What is the final output voltage?
1 V
2 V
1.0 V
2.5 V
What is the process of exchanging information called?
Telephony
Broadcasting
Communication
Modulation
What is the function of a transmitter?
To recover the original signal from the channel.
To amplify the signal.
To filter out unwanted frequencies.
To convert the information into a signal suitable for transmission over a medium.
What is the communication channel?
A device that converts an electrical signal into a signal suitable for transmission.
A collection of electronic components that accepts a transmitted message.
A random, undesirable electronic energy that interferes with a message.
The medium by which the electronic signal is sent from one place to another.
What is the definition of a receiver?
A device that amplifies the signal before transmission.
A device that modulates the carrier wave.
A collection of electronic components that accepts the transmitted message from the channel and converts it back into a form understandable by humans.
A device that removes noise from the signal.
What is noise in a communication system?
The signal that carries information.
The medium through which a signal is sent.
The process of recovering information at the receiver.
Random, undesirable electronic energy that enters the communication system and interferes with the transmitted message.
What is a "simplex" communication system?
A two-way communication where both parties can talk simultaneously.
A two-way communication where only one party can transmit at a time.
A one-way communication.
A system that uses only digital signals.
A police or military radio transmission is an example of what type of communication?
Simplex
Half duplex
Full duplex
Broadband
What is an analog signal?
A signal that changes in steps or discrete increments.
A signal that uses binary codes.
A smoothly and continuously varying voltage or current.
A signal that is degraded by noise.
Which of the following is an example of a digital signal?
Sine wave
Voice
Video (TV)
Morse code
Why is modulation needed for radio transmission?
To reduce noise.
Because voice signals cannot be transmitted directly by radio.
To increase the signal's attenuation.
To convert analog signals to digital.
What is the process of altering a characteristic of the carrier signal in accordance with the instantaneous value of the information signal?
Demodulation
Multiplexing
Modulation
Attenuation
What is a "carrier signal"?
The signal that contains the message or information.
The unmodulated signal that suits a particular application.
The final signal that is transmitted to the antenna.
A signal that has been degraded by noise.
What is a "modulating signal"?
The signal that is transmitted over the medium.
The unmodulated signal.
The signal that is recovered at the receiver.
The signal that causes the variation and represents the message.
What is the purpose of modulation?
To increase the size of the antenna.
To decrease the security of the transmission.
To reach a far distance.
To reduce the number of channels.
Which type of multiplexing involves using different frequencies for each signal?
Time-division multiplexing
Frequency-division multiplexing
Code-division multiplexing
Wavelength-division multiplexing
A smoothly and continuously varying voltage or current is the definition of a(n) ____ signal.
Digital
Binary
Analog
Modulated
A signal that changes in steps or discrete increments is the definition of a(n) ____ signal.
Analog
Continuous
Digital
Broadband
What does "Baseband transmission" mean?
The signal is sent using a carrier wave.
The signal is sent using frequency modulation.
The information is sent directly and unmodified over the medium.
The signal is transmitted over free space.
Which type of multiplexing involves sampling multiple signals sequentially and using a small piece of each to modulate the carrier?
Frequency-division multiplexing
Time-division multiplexing
Code-division multiplexing
Wavelength-division multiplexing
