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ESE 2021 Technical Quiz 66 || Multiplexing and Digital Coding Techniques

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Question 1

Match the following List-I with List-II
List-I
A) PCM
B) FSK
C) Asynchronous TDM
D) DM
List-II
1) Telegraphy
2) Pulse shifting
3) Simple circuit
4) Companding
5) Threshold effect

Question 2

In a code-division multiple access (CDMA) system with N = 8 chips, the maximum number of users who can be assigned mutually orthogonal signature sequences is ________

Question 3

Twenty four voice signals are sampled uniformly at a rate of 8 KHz and then time division multiplexed. The sampling process uses flat top samples with 1 Hs. Duration. The multiplexing operation includes provision for synchronization by adding and extra pulse of 1 us duration. The spacing b/w successive pulses of the multiplexed signal is

Question 4

The raised cosine pulse p(t) is used for zero ISI in digital communications. The expression for p(t) with unity roll-off factor is given by . The value of p(t) at is:

Question 5

The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other are
1) Frequency Division Multiple Access (FDMA)
2) Time Division Multiple Access (TDMA)
3) Code Division Multiple Access (CDMA)
Which of the above are correct?
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May 29ESE & GATE EC