Maharashtra State Board of Technical Education 2008 Diploma Electronics and Communication Communication System II - Question Paper

3 Hours / 100 Marks

Instructions - 1. All ques. are compulsory
2. Illustrate your answers with neat sketches wherever
necessary.
3. Figures to the right indicate full marks.
4. presume suitable data, if necessary.


1. Attempt any 5 of the following: MARKS:20

a) What is Radar beacon? State its applications.
b) Define subsequent terms related to satellite communication.
1) Geostationary satellite.
2) Look angles
c) Compare LED and Laser Diode
d) State 4 applications of satellite communication
e) State the additional services given by telephone exchange?
f) Explain scanning mechanism in a FAX machine in short.
g) What is acceptance angle and numerical aperture in optical fiber?

2. Attempt any 4 of the following: MARKS:16

a) Explain how call is processed in Mobile Technology in brief.
b) State functions of subsequent components:
1. Flanges
2. Circulators
3. Isolators
4. Hybrid Tees
c) Describe subsequent terms related to Mobile Communication?
1. Handoff
2. Cell Splitting
d) What are the advantages of fiber optical communication cable
e) Compare PIN photodiode and avalanche photodiode
f) Compare mobile telephony and cellular telephony.

3. Attempt any 2 of the following: MARKS:16

a) With block diagram discuss working of the mobile phone system.
b) Draw block diagram of earth station and discuss function of every block.
c) State and discuss in brief losses in fiber optics.

4. Attempt any 2 of the following: MARKS:16
a) Draw block diagram of cordless telephone and discuss every block in
brief.
b) discuss subsequent display methods of Rada:
1. A-Scope
2. Plan Position Indicator
c) State satellite subsystems and discuss in brief.

5. Attempt any 2 of the following: MARKS: 16

a) With neat schematic diagram discuss working principle of reflex klystron
b) What is FAX? Draw block diagram of FAX Transreceiver and discuss functions of every block.
c) Draw block diagram of electronic telephone exchange and discuss.

6. Attempt any 2 of the following: MARKS:16

a) With neat schematic diagram discuss working principle of PIN diode.
b) What is rectangular waveguide? discuss TE and TM modes in rectangular waveguide.
c) Draw constructional details of Magnetron and discuss its principle of working. List different applications if Magnetron

Earning:   Approval pending.