Maharashtra State Board of Technical Education 2009 Diploma Electronics Engineering (DEE) for Optical Fiber

Sample ques. Paper
Course Name : Electronics engineering group
Course Code : EV
Semester : Sixth
Subject : Optical Fiber and Mobile Communication.
Marks : 80 Time: three Hrs.
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.
5. Preferably, write the answers in sequential order.
Q.1 Attempt any 4 of subsequent. 16 Marks
a) describe the term numerical aperture.
State the effect of refractive index of core and cladding on it.
b) Compare conventional coaxial cable with FOC with respect to
i) Losses ii) Cross talk iii) Bandwidth iv)Economics
c) i) provide the classification of FOC on the basis of mode of propagation and index
profile
ii) State the mathematical formula for the number of modes possible for a provided
cable.
d) Draw a tagged diagram of a tapered sleeve connector. define its construction.
e) What is adjacent channel interference. Support your ans with neat tagged
diagram.
f) State any eight GSM air interface parameters.
Q.2 Attempt any 3 of subsequent. 12 Marks
a) With graphical representation discuss losses due to 1) ultra violet absorption 2)
Infrared absorption.
b) Sketch tagged structure of ILD and compare laser diode with LED with respect to
i) harmonic distortion ii) optical power coupling.
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c) define layered structure of SONET with neat diagram.
d) discuss how cell splitting increases the capacity of cellular system.
Q.3 Attempt any 3 of subsequent. 12 Marks
a) Draw cross part structure of the subsequent 1) Step index OFC 2) Graded index
OFC. State how refractive index modifications in both ranging from core and cladding
b) discuss the process of avalanche multiplication in avalanche photo diode.
c) discuss the concept of Synchronous optical network.
d) discuss the mobile-to-mobile call procedure.
Q.4 Attempt any 4 of subsequent. 16 Marks
a) discuss the cause for occurrence of intermodal dispersion in FOC.
b) Compare single mode step index and multimode step index fiber with reference
to: 1) dispersion 2) transmission rate 3) core size 4) manufacturing process
c) State any 4 requirement of good FOC connector.
d) provide structure of LED. State the principle on which it works.
e) State the function of subsequent block in GSM as architecture 1) Visitor location
register 2) mobile switching center
f) What is m_commerce? State the services it provides.
Q.5 Attempt any 2 of subsequent. 12 Marks
a) discuss the subsequent terms with neat diagram 1) roaming 2) adjacent channel
interference.
b) discuss stepwise procedure for perfusion splicing method.
c) Draw well tagged architecture of GSM. State functions of any four blocks in it.
Q.6 Attempt any 3 of subsequent. 12 Marks
a) With the help of diagram discuss the concept of cellular frequency reuse. State
mathematical formula which provide the total number of cellular channels available
in the cluster.
b) discuss any two services given by GSM.
c) Draw optical digital communication system and discuss its operation.
d) discuss the subsequent losses in OFC 1) scattering losses 2) Rayleigh's losses.

Earning:   Approval pending.