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WorksheetsQUIZ NO. 3 MEXE 3102
Total questions: 20
Worksheet time: 3mins
Which of the following is true about the difference between data and signals?
Data and signals are identical concepts in communication.
Data is the raw entity; signals are the transmission form of data.
Signals exist only in digital form, while data can be both analog and digital.
Data always requires analog signals to be transmitted.
Which type of signal is more resilient to noise but requires more bandwidth?
Analog signal
Digital signal
Composite signal
Periodic signal
An analog sine wave is often used in communication theory because:
It has infinite bandwidth.
It is the simplest form of a periodic signal.
It requires no medium for propagation.
It can represent digital bits directly.
Which of the following parameters of a sine wave determines its energy level in transmission?
Frequency
Phase
Amplitude
Spectrum
Which of the following best describes a composite signal?
A signal with only one frequency component
A signal made by digital-to-analog conversion only
A signal formed by multiple sine waves combined
A digital waveform with infinite frequency
The spectrum of a signal refers to:
The physical medium that carries the signal
The range of frequencies that compose the signal
The voltage levels used in digital signaling
The number of cycles per second
In communication, the bandwidth of a medium is:
The maximum data rate achievable
The frequency range the medium can pass without significant loss
The number of voltage levels supported
The number of cycles completed per second
Which statement best explains why digital signals are more suitable for computer networks?
They consume less bandwidth than analog signals.
They are less sensitive to noise and easier to regenerate.
They provide continuous representation of information.
They eliminate the need for synchronization.
Which property of analog signals makes them more prone to distortion over long distances?
They require infinite bandwidth.
They use discrete values.
They are continuous and can assume infinite values.
They always depend on phase shift.
In signal analysis, Fourier's theorem states that:
Every signal must be digital to be transmitted.
Every periodic signal can be decomposed into a set of sine waves.
Only analog signals can be represented mathematically.
The bandwidth of a signal is infinite.
The Nyquist sampling theorem (covered later but rooted in Chapter 3 concepts) relates to:
The minimum number of samples needed to reconstruct an analog signal
The minimum amplitude needed to transmit a digital signal
The relationship between baud rate and bit rate
The maximum power level of a composite signal
Which of the following best describes a periodic signal?
It changes randomly with time
It repeats its pattern over regular intervals
It has infinite frequency components
It can only be digital in nature
What distinguishes a non-periodic signal from a periodic one?
It has lower amplitude
It requires less bandwidth
It does not repeat its pattern over time
It is always analog
Which feature of a signal is directly related to synchronization in data transmission?
Frequency
Phase
Amplitude
Bandwidth
The harmonics of a composite signal are:
Frequencies higher than the fundamental frequency
The maximum power levels of the signal
Voltage levels in digital waveforms
Frequencies that cannot be transmitted
The effective bandwidth of a digital signal depends primarily on:
The number of bits in each character
The number of signal level changes per second
The transmission medium only
The sampling rate of the source
Why is phase considered an important characteristic of signals?
It determines the maximum achievable bandwidth.
It identifies the position of the waveform in time.
It defines the average energy of the signal.
It reduces the effects of noise.
Which of the following is an advantage of digital signals over analog signals in networking?
They require no bandwidth.
They can be easily compressed, encrypted, and multiplexed.
They eliminate the need for transmission media.
They always transmit at higher speed.
If the spectrum of a signal ranges from 100 Hz to 300 Hz, which statement is true?
The bandwidth is 100 Hz.
The bandwidth is 200 Hz.
The maximum frequency is 100 Hz.
The signal must be digital.
Which statement best reflects the role of signals in data communications?
Signals are optional because data can be transmitted directly.
Signals act as carriers that transport data across a medium.
Signals and data are equivalent forms of storage.
Signals are only used for wireless communications.
