Forouzan Chapter 6 MCQ Flashcards
The _______ technique uses M different carrier frequencies that are modulated by the source signal. At one moment, the sign modulates one carrier frequency; at the next moment, the signal modulates another carrier frequency.
A) DSSS
B) FHSS
C) FDM
D) TDM
FHSS
In synchronous TDM, for n signal sources of the same data rate, each frame contains _______ slots.
A) n + 1 C) 0 to n
B) n – 1 D) n
n
Which multiplexing technique transmits digital signals?
A) WDM C) TDM
B) FDM D) None of the above
TDM
The sharing of a medium and its link by two or more devices is called _______.
A) modulation C) encoding
B) multiplexing D) line discipline
multiplexing
. _______ is designed to be used in wireless applications in which stations must be able to share the medium without interception by an eavesdropper and without being subject to jamming from a malicious intruder.
A) Multiplexing C) Modulation
B) Spread spectrum D) None of the above.
Spread spectrum
______ is an analog multiplexing technique to combine optical signals.
A) WDM C) TDM
B) FDM D) None of the above
WDM
FDM is an _________technique.
A) digital C) either (a) or (b)
B) analog D) none of the above
analog
. ______ can be applied when the bandwidth of a link (in hertz) is greater than the combined bandwidths of the signals to be transmitted.
A) TDM C) Both (a) or (b)
B) FDM D) Neither (a) or (b)
FDM
In TDM, the transmission rate of the multiplexed path is usually _______ the sum of the transmission rates of the signal sources.
A) equal to C) greater than
B) less than D) not related to
greater than
In a multiplexed system, ____ lines share the bandwidth of _____ link.
A) 1; n C) 1; 1
B) n; 1 D) n; n
n; 1
_________ utilization is the use of available bandwidth to achieve specific goals.
A) Amplitude C) Bandwidth
B) Frequency D) None of the above
Bandwidth
. ____ is designed to use the high bandwidth capability of fiber-optic cable.
A) WDM C) TDM
B) FDM D) None of the above
WDM
We can divide ____ into two different schemes: synchronous or statistical.
A) WDM C) FDM
B) TDM D) none of the above
TDM
In ________ TDM, each input connection has an allotment in the output even if it is not sending data.
A) isochronous C) synchronous
B) statistical D) none of the above
synchronous
In ________ TDM, slots are dynamically allocated to improve bandwidth efficiency.
A) isochronous C) statistical
B) synchronous D) none of the above
statistical
. The word ______ refers to the portion of a _______ that carries a transmission.
A) line; channel C) link; channel
B) channel; link D) line; link
channel; link
Which multiplexing technique shifts each signal to a different carrier frequency?
A) FDM C) Both (a) and (b)
B) TDM D) None of the above
FDM
. Which multiplexing technique transmits analog signals?
A) WDM C) FDM
B) TDM D) (a) and (c)
WDM, FDM
________ is the set of techniques that allows the simultaneous transmission of multiple signals across a single data link.
A) Demodulating C) Compressing
B) Multiplexing D) None of the above
Multiplexing
. ________ can be achieved by using multiplexing; ______ can be achieved by using spreading.
A) Privacy and antijamming; efficiency
B) Privacy and efficiency; antijamming
C) Efficiency; privacy and antijamming
D) Efficiency and antijamming; privacy
Efficiency; privacy and antijamming
The ______ technique expands the bandwidth of a signal by replacing each data bit with n bits.
A) DSSS C) FDM
B) FHSS D) TDM
DSSS
________ is a digital process that allows several connections to share the high bandwidth of a link.
A) WDM C) FDM
B) TDM D) None of the above
TDM
_______ is a digital multiplexing technique for combining several low-rate channels into one high-rate one.
A) WDM C) FDM
B) TDM D) None of the above
TDM
. In ________, we combine signals from different sources to fit into a larger bandwidth.
A) line coding C) spread spectrum
B) block coding D) none of the above
spread spectrum
. Which multiplexing technique involves signals composed of light beams?
A) WDM C) TDM
B) FDM D) none of the above
WDM
