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Multiple Choice Quiz
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1
The linear mixing process in an FDM system that does not attenuate the signal uses
A)a simple resistor network
B)an RC network
C)a filter circuit
D)an op amp summer
2
Another name for an FM demodulator is
A)discriminator
B)encoder
C)multiplexer
D)modulator
3
The basic subsidiary communications authorization signal is a separate subcarrier of
A)67 Hz which is amplitude-modulated by audio signals
B)67 KHz which is phase-modulated by RF signals
C)67 KHz which is frequency-modulated by audio signals
D)67 KHz which is amplitude-modulated by audio signals
4
An alternate service provided by some FM stations that allows digital data to be transmitted to the FM receiver is called
A)Digital Data System
B)Radio Data System
C)Digital Radio System
D)Satellite Radio
5
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In the circuit illustrated above, at the output of what stage will you find the original multiplexed signal?
A)superheterodyne receiver
B)FM demodulator
C)balanced modulator
D)FM demodulator
6
If the appropriate system is used, what stage will output the name and artist of music selections being played by the station?
A)linear combiner
B)frequency doubler
C)QPSK demodulator
D)FM demodulator
7
In what type of multiplexing does each signal occupy the entire bandwidth of the channel?
A)frequency-division multiplexing
B)time-division multiplexing
C)pulse-width multiplexing
D)phase-shift multiplexing
8
Which multiplexer operates as a single-pole multiple-position mechanical or electronic switch that sequentially samples the multiple analog inputs at a high rate of speed?
A)frequency-division multiplexer
B)phase-shift multiplexer
C)pulse-amplitude modulated multiplexer
D)pulse-width multiplexer
9
What type circuits are used to remedy the synchronization problem encountered in demultiplexing?
A)clock recovery circuits
B)clock redundancy circuits
C)time-multiplex circuits
D)pulse-synch circuits
10
Which of the following is a very popular form of multiplexing where multiple channels of digital data are transmitted in serial form?
A)frequency-division multiplexing
B)phase-shift multiplexing
C)pulse-amplitude modulated multiplexing
D)pulse-code modulated multiplexing





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