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WorksheetsWCM Chapter 2
Total questions: 52
Worksheet time: 26mins
Sine waves have a pure sound because they consist of energy at only _______ frequency.
two
half
three
one
What is the Nyquist Rate for 80 kHz signal frequency
240 kHz
80 kHz
160 kHz
40 kHz
The distance travelled by a wave during the time of one cycle is called the ____________.
Wavelength
Frequency
Amplitude
Period
Which one does not belong to Analogue to PCM conversion
Sampling
Signaling
Encoding
Quantization
In 'Unipolar Encoding', a Positive voltage represents ________, and Zero voltage indicates a __________
0, 0
1, 1
0, 1
1, 0
In 'Manchester' line coding, there is a transistion at ____________________.
start & end of each bit period.
middle of each bit period
start of each bit period.
end of each bit period
An analogue signal carries 4 bits in each signal element. If 1000 signal elements are sent per second, find the 'Baud Rate'.
1000 bauds per second
2000 bauds per second
4000 bauds per second
3000 bauds per second
The 'Frequency' of a signal measures the ________________________________.
Number of complete cycles per second.
Changes between peaks
Time taken for a cycle to complete.
Difference between upper and lower frequency
What is the term known of for transfer one form energy to another form of energy?
Transducer
capacitor
Transistor
resistor
Sound waveforms can be broken down into a series of frequency components known as ________________________.
Microwaves
harmonics
gramma ray
X-ray
What is a wave?
A transfer of energy
A transfer of matter
A transfer of force
A transfer of light
What is the standard unit for wavelength?
Hertz (Hz)
Meter (m)
Second (s)
Joule (J)
What is the velocity of sound waves in water?
343.21 m/s
1,484 m/s
3 x 108 m/s
Unknown
Which of the following is an example of a wave?
A rock
A car
A sound
A tree
What is the velocity of radio waves?
343.21 m/s
1,484 m/s
3 x 108 m/s
unknown
Which of the following best describes the production of sound?
Sound is caused by the movement of light
Sound is produced by the vibrations of an object
Sound is produced by the movement of water
Sound is produced by the movement of gases
What is the unit of measurement for the frequency of a sound wave?
Joules
Newtons
Hertz
Watts
Which of the following types of sound waves is considered to have a pure sound?
Complex waves
Sine waves
Harmonic waves
Inverted waves
What are the individual frequency components that make up a complex waveform known as?
Components
Harmonics
Pure tones
Sine waves
Which of the following best defines a signal?
An electrical component used to transmit information
A device used to convert sound waves into mechanical energy
A function that conveys information about the behaviour or attributes of some phenomenon
A physical medium used to transmit information wirelessly
Which device converts sound waves into electrical signals?
A transducer
A sensor
A microphone
A loudspeaker
What is the period of a signal?
The time taken to complete one cycle
The maximum value of voltage or current in a signal
The number of complete cycles per second
The difference between the upper and lower frequency limits of a signal
What is the peak-to-peak amplitude of a signal?
The maximum value of voltage or current in a signal
The change between peaks and trough
The average amplitude of a wave over time
The difference between the upper and lower frequency limits of a signal
What is the Root-Mean-Squared value of a wave?
The maximum value of voltage or current in a signal
The change between peaks and trough
The average amplitude of a wave over time
The difference between the upper and lower frequency limits of a signal
Which of the following is the simplest form of line encoding?
Manchester encoding
Bipolar encoding
Unipolar encoding
Polar encoding
Which line encoding scheme is also known as "None Return to Zero"?
Manchester encoding
Polar encoding
Bipolar encoding
Unipolar encoding
Which line encoding scheme eliminates the Residual DC problem of Unipolar encoding?
Manchester encoding
Bipolar encoding
Polar encoding
All of the mention
Which line encoding scheme uses mid-bit transitions as a clocking mechanism?
Manchester encoding
Polar encoding
Bipolar encoding
Which line encoding scheme requires the least amount of bandwidth?
Manchester encoding
Polar encoding
Bipolar encoding
Unipolar encoding
Which line encoding scheme has the added benefit of reducing the power required to transmit the signal by one-half?
Manchester encoding
Polar encoding
Bipolar encoding
Unipolar encoding
Which line encoding scheme cancels the Residual DC component by alternating the polarity of the pulses for 1's?
Manchester encoding
Polar encoding
Bipolar encoding
Unipolar encoding
What is bit rate?
The number of signal units per second that represent bits
The speed with which information is transferred
The total number of outputs signaling states
The number of bits carried by each signal element
What is baud rate?
The number of bits transmitted during one second
The number of signal units per second that are required to represent bits
The number of bits carried by each signal element
The total number of outputs signaling states
If the voltage used to represent signal has only two values, what is the relationship between baud rate and bit rate?
Baud rate is the same as bit rate
Bit rate is 3 times the baud rate
Baud rate is 3 times the bit rate
Baud rate and bit rate are unrelated
What is the formula to calculate the total number of outputs signaling states?
L = 2n
L = n2
L = n!
L = 2n
What determines the bandwidth required to send a signal?
Bit rate
Baud rate
Number of bits carried by each signal element
Total number of outputs signaling states
If an analog signal carries 8 bits in each signal element and 2000 signal elements are sent per second, what is the bit rate?
2000 bps
8000 bps
16000 bps
32000 bps
If the bit rate of a signal is 12000 and each signal element carries 4 bits, what is the baud rate?
3000 baud
4000 baud
48000 baud
96000 baud
ASCII also known as
American Standard Code for Information Interchange
American Scientific Character Identification Index
American Science Computing Identification Index
American School Coding Indication Index
ASCII have ___ unique characters
64
128
256
1024
Unicode have over ____ characters
100
1000
10000
100000
Sampling is the act of capture _____ data at certain time of the point.
Analogue
Digital
wired
wireless
Audio sampling at 44.1kHz with 16bits in sizes, how many level are there?
16
256
1024
65536
Telephony sampling at 8kHz in size of 8 bits, what is the number of level for the sampling?
16
128
256
1024
Nyquist Rate =
2 fm
fm
0.5 fm
4 fm
Quantisation is the conversion of analogue signal to the nearest ____ during the sampling
level
time
period
frequency
The following Manchester Line Encoder produce what data after decoding
0101100010
1010010010
1010011101
1010011111
The quantum levels in a PCM system are 0.1V, 0.2V, 0.3V and 0.4V. Calculate the quantizationnoise when the sampling voltage is 0.16V.
0.04V
0.06V
0.24V
0.16V
A radio signal operated at 2.4GHz, what is the wavelength of the signal.
0.125m
0.139m
12.5mm
139nm
What is the maximum quantum noise if the step size is 0.2V?
0.05V
0.1V
0.15V
0.4V
For the following analogue waveform, what will be received after PCM encoding?
101011101100
101111110001
10110100000
101100001110
What is PCM?
A means by which digital signals are converted to analogue signals
A means by which analogue signals are compressed
A means by which analogue signals are converted to digital signals
A means by which digital signals are compressed
