A directory of Objective Type Questions covering all the Computer Science subjects. Here you can access and discuss Multiple choice questions and answers for various compitative exams and interviews.

81. The multiplexing technique, in which each input connection has an allotment in the output even if it is not sending data is
a. Asynchronous TDM
b. Synchronous TDM
c. FDM
d. WDM
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Answer: (b).Synchronous TDM

82. In synchronous TDM, the data rate of the link is n times faster and the unit duration is
a. n times shorter
b. n+1 times shorter
c. n-1 times shorter
d. remains same
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Answer: (a).n times shorter

83. The frequency difference between the Wavelength-Division Multiplexing (WDM) and Frequency-Division Multiplexing ( FDM ) is
a. very high
b. very low
c. zero
d. infinity
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Answer: (a).very high

84. FDM is an analog multiplexing technique that combines
a. digital signals
b. analog signals
c. both a and b
d. None
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Answer: (b).analog signals

85. The two techniques to spread the bandwidth are
a. FHSS and TDM
b. DSSS and FHSS
c. FDM and FHSS
d. None of the above
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Answer: (b).DSSS and FHSS

86. How many types of multiplexing techniques are
a. one
b. two
c. three
d. four
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Answer: (c).three

87. In multiplexing, channels are separated by unused strips of bandwidth guard bands - to prevent
a. Synchronization
b. Overlapping
c. random motion of electrons
d. Both b and c
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Answer: (b).Overlapping

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