Rashtrasant Tukadoji Maharaj Nagpur University 2010 B.E Electronics & Communication Engineering Faculty of Engineering and Technology, LINE COMMUNICATION AND SWITCHING SYSTEM - Question Paper

part A

1. (a) Compare different codes used in telegraphy.
(b) discuss polarized telegraph relay with telegraph.

2. (a) discuss the principle of operation of morse sounder. elaborate the proper adjustments for spring tension, residual air gap and play of the armature?
(b) Differentiate ranging from telegraphy and telephony.

3. (a) define teleprinter receiver with the help of neat diagram.
(b) define method of signalling as employed in a Telex Network for local calls.

4. (a)Explain the theory of carbon granule microphone.
(b) What is side tone? How does it affect a telephonic communication? discuss principle of antiside tone circuit.

5. (a) elaborate the functions and importance of Transmission bridges? elaborate different types?
(b) discuss the importance of subsequent terms as related to facsimile Transmitter and Receiver?

part B

6. (a) Draw and discuss the trunking diagram of 100 line exchanges. discuss the terms:
(i) Line Finder
(ii) Final Selector
(iii) Link
(b) discuss the different parts of uniselector by giving Schematic representation of every part.

7. (a) define the various tones used in Automatic Exchange. elaborate their functions?
(b) describe the terms:
(i) Busy Hour Calling rate
(ii) Grade of service.

8. (a) elaborate the directional filters? Do they possess any directional property?
(b) discuss the concept of ISDN. How are the various system transmitted over identical channel? discuss neat sketch.

9. (a) What is power line carrier communication? discuss its advantages and disadvantages.
(b) explain the modes of operation of common channel signalling,

10. Write short notes on (any THREE):
(i) Cellular Telephony
(ii) BORSCHT Functions
(iii) Electronic switching system
(iv) Subscriber Line Interface Circuit

Earning:   Approval pending.