WorksheetsPage 1
Total questions: 12
Worksheet time: 6mins
In a basic communication system, which component originally generates the information to be transmitted?
User interpreting the final message
Receiver converting the signal back
Channel carrying the modulated signal
Source providing the initial information
Transmitter unit inside the device
Encoding in a transmitter primarily serves which function?
Calibrate the receiving antenna
Increase physical layer bandwidth
Change data into another format
Boost carrier frequency stability
In the receiver, detection is synonymous with which function?
Modulation
Quantization
Demodulation
Multiplexing
Why is a high-frequency carrier used for transmitting a low-frequency message?
To remove noise by lowering the wavelength
To preserve information while enabling efficient radiation
To increase message amplitude beyond safe limits
To avoid the need for an antenna altogether
For efficient radiation, the practical antenna height is typically chosen to be which fraction of the wavelength λ?
One quarter of the wavelength
One half of the wavelength
One eighth of the wavelength
Equal to the full wavelength
When transmitting audio over large distances, what is the typical approach?
Superimpose audio onto a high-frequency carrier
Transmit audio at baseband through the air
Increase audio amplitude without modulation
Use a longer antenna to match audio wavelength
Which advantage most directly enables smart homes and autonomous vehicles?
Scalability to add more client devices easily
Innovation through new wireless-enabled services
Convenience due to simplified installation process
Cost-effectiveness from cheaper hardware sourcing
You must expand a campus network quickly across several buildings. Which advantage of wireless is most relevant?
Scalability to extend coverage without cabling
Convenience for faster installation steps
Cost-effectiveness in equipment procurement
Innovation through novel IoT integrations
Which transmission mode allows communication only in one direction at a time and is typically used by devices like keyboards and monitors?
Simplex transmission mode
Hybrid duplex transmission mode
Half duplex transmission mode
Full duplex transmission mode
Which pair correctly matches typical frequency ranges of signals in AM systems?
Both carrier and message: high frequency
Both carrier and message: low frequency
Carrier: low frequency; Message: high frequency
Carrier: high frequency; Message: low frequency
Why is the message signal described as low frequency in AM systems?
It cannot be filtered by receivers
It is independent of modulation process
It is produced by high-speed oscillators
It originates from baseband information
Over modulation is characterized by a modulation index μ where which condition holds?
μ equals zero
μ greater than one
μ equals one exactly
μ less than one
