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WorksheetsData and Digital Communications Quiz #1
Total questions: 20
Worksheet time: 18mins
A digital radio system uses 5 bits in transmitting its information. How many possible outputs are there?
32
16
8
4
In a BPSK modulator, the Nyquist bandwidth is always equal to the input data rate.
It is the transmittal of digital signals between two or more points in a communications system.
Digital Radio
Digital Transmission
Digital Communications
Digitalization
It is the minimum theoretical bandwidth necessary to propagate a signal.
The higher the signal-to-noise ratio, the better the performance and the higher the information capacity. This describes the _____.
Nyquist Theorem
Hartley's Law
Shannon Limit for Information Capacity
none of these
It performs the level conversion and then encodes the incoming data into groups of bits that modulate the analog carrier.
Precoder
Buffer
Modulator
Bandpass filter
Which of the following is/are correct? (You may select more than one answer)
In FSK, the mark and space frequencies and the carrier frequency are transmitted simultaneously.
Mark and Space Frequencies represent logic 1 and logic 0 in FSK.
FSK receivers experience difficulty in recovering the data due to the absence of carrier frequency during transmission.
A form of digital modulation where the digital information is contained in both the amplitude and phase of the transmitted carrier.
ASK
QAM
FSK
PSK
It is the transmittal of a digitally modulated analog carrier between two points in a communications system.
Digital Radio
Digitalization
Digital Communications
Digital Transmission
It is the creation, delivery, and processing of information with the aid of electronic circuits.
During the modulation process, it is the frequency of the carrier is varied by the digital information.
ASK
QAM
PSK
FSK
A component of a digital radio system where the modulated signal travels upon transmission.
Precoder
Modulator
Carrier and Clock Recovery
Transmission Medium
The most basic digital symbol used to represent information is ____.
bit
byte
nimble
character
It relates information capacity to the transmission time and bandwidth.
Nyquist Theorem
Hartley’s Law
Shannon Limit for Information Capacity
None of these
It refers to the rate of change of a signal on the transmission medium after encoding and modulation have occurred.
Bit Rate
Signal Rate
Transmission speed
Baud
A BPSK modulator has an input data rate is 4Mbps with a carrier frequency equal to 50MHz. Determine the double-sided Nyquist bandwidth.
2MHz
3MHz
4MHz
8MHz
The baud for binary FSK is equal to:
Twice the bit rate
Half the bit rate
Equal to the bit rate
Zero
The general expression for frequency deviation in FSK is written as:
Δf = (fs – fm)/2
Δf = (fs + fm)/2
Δf = fb/2
Δf = fc × fm
The worst-case modulation index occurs when:
Frequency deviation is minimum
Modulating frequency is minimum
Both frequency deviation and modulating frequency are maximum
Both are zero
The two phases in BPSK are separated by:
