Forouzan Chapter 6 MCQ

Question 1

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

Answer 1

FHSS

Question 2

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

Answer 2

n

Question 3

Which multiplexing technique transmits digital signals?
A) WDM C) TDM
B) FDM D) None of the above

Answer 3

TDM

Question 4

The sharing of a medium and its link by two or more devices is called _______.
A) modulation C) encoding
B) multiplexing D) line discipline

Answer 4

multiplexing

Question 5

. _______ 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.

Answer 5

Spread spectrum

Question 6

______ is an analog multiplexing technique to combine optical signals.
A) WDM C) TDM
B) FDM D) None of the above

Answer 6

WDM

Question 7

FDM is an _________technique.
A) digital C) either (a) or (b)
B) analog D) none of the above

Answer 7

analog

Question 8

. ______ 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)

Answer 8

FDM

Question 9

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

Answer 9

greater than

Question 10

In a multiplexed system, ____ lines share the bandwidth of _____ link.
A) 1; n C) 1; 1
B) n; 1 D) n; n

Answer 10

n; 1

Question 11

_________ utilization is the use of available bandwidth to achieve specific goals.
A) Amplitude C) Bandwidth
B) Frequency D) None of the above

Answer 11

Bandwidth

Question 12

. ____ is designed to use the high bandwidth capability of fiber-optic cable.
A) WDM C) TDM
B) FDM D) None of the above

Answer 12

WDM

Question 13

We can divide ____ into two different schemes: synchronous or statistical.
A) WDM C) FDM
B) TDM D) none of the above

Answer 13

TDM

Question 14

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

Answer 14

synchronous

Question 15

In ________ TDM, slots are dynamically allocated to improve bandwidth efficiency.
A) isochronous C) statistical
B) synchronous D) none of the above

Answer 15

statistical

Question 16

. The word ______ refers to the portion of a _______ that carries a transmission.
A) line; channel C) link; channel
B) channel; link D) line; link

Answer 16

channel; link

Question 17

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

Answer 17

FDM

Question 18

. Which multiplexing technique transmits analog signals?
A) WDM C) FDM
B) TDM D) (a) and (c)

Answer 18

WDM, FDM

Question 19

________ 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

Answer 19

Multiplexing

Question 20

. ________ 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

Answer 20

Efficiency; privacy and antijamming

Question 21

The ______ technique expands the bandwidth of a signal by replacing each data bit with n bits.
A) DSSS C) FDM
B) FHSS D) TDM

Answer 21

DSSS

Question 22

________ 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

Answer 22

TDM

Question 23

_______ 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

Answer 23

TDM

Question 24

. 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

Answer 24

spread spectrum

Question 25

. Which multiplexing technique involves signals composed of light beams?
A) WDM C) TDM
B) FDM D) none of the above

Answer 25

WDM