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1997 Course Electronics Communication - II

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Total No. of Questions : 10] P1456 [Total No. of Pages : 3 [3764]-1041 B.E. (Electronics) ELECTRONICS COMMUNICATION - II (1997 Course) Time : 3 Hours] [Max. Marks :100 Instructions to candidates : 1) Answer any three questions from each section. 2) Answers to the two sections should be written in separate books. 3) Neat diagrams must be drawn wherever necessary. 4) Figures to the right indicate full marks. 5) Use of logarithmic tables, slide rule, Mollier charts, electronic pocket calculator and steam tables is allowed. 6) Assume suitable data, if necessary. SECTION - I Q1) a) Calculate: i) Cut off frequency. iii) Phase velocity. v) [10] ii) Guide wavelength. iv) Group velocity. Characteristics Impedance. for a rectangular air filled X-band Copper waveguide with dimension 6 c.m x 3 c.m cross section and 30 c.m length is used to propagate TE11 mode at 10 GHz. b) Explain the operation of an Isolator with simple diagram. [6] Q2) a) By means of construction details and applegate diagram, explain the operation of a Reflex Klystron Oscillator. [8] b) Explain the operation of a Gunn diode . Discuss the constructional details, equivalent circuit. [8] Q3) a) What is Horn Antenna ? Illustrate its types and list their common features. [8] b) Write brief notes on LASERS and MASERS . [8] P.T.O. Q4) a) Define pattern multiplication . Explain the principle of pattern multiplication with examples. [8] b) What is an antenna array ? Explain any one of the arrays in detail. [8] Q5) Write short notes on any THREE: [18] a) Optical Amplifier. b) Mobile Assisted Hand-Off (MAHO). c) SIM Card. d) ISI and Eye Pattern. e) SONET. SECTION - II Q6) a) Explain the basic functions of search radars and tracking radars. Discuss various scanning and tracking methods. [10] b) Assume that a civilian radar has a maximum range of 80 kms. Determine, i) Maximum range with an equivalent echoing area of 81 times & ii) Effect of doubling the transmitter power on the range. [8] Q7) a) With neat and necessary diagrams explain the concept of micro and macro bending losses in fiber. [8] b) A certain optical fiber has an attenuation of 0.25dB/km at 1300 nanometers and 0.2 dB/km at 1500 nanometers respectively. Suppose, two optical signals are launched simultaneously into the same fiber with an optical power of 300 micro watts at 1300 nm and 200 micro Watts at 1500 nm, calculate the power levels in microwatts of these two signals at (i) 20 km and (ii) 50 km. [8] Q8) a) Define and explain the following terms of optical fiber communication:[8] i) Numerical Aperture. ii) Modes in fibers. iii) Index Profile. iv) V-number. [3764]-1041 2 b) For a multimode graded index fiber, Calculate: [8] i) Relative Refractive Index Difference. ii) Delay difference between slowest and fastest modes at the output. iii) RMS pulse broadening. iv) Maximum Bit Rate, whose refractive index of the core is 1.65 and the refractive index of cladding is 15% less than that of its core with the fiber length of 15 k.m. Q9) a) What is meant by Doppler effect ? Derive the expression for the same. [8] b) Draw the basic block diagram of the Mobile Cellular Systems and explain each blocks briefly. [8] Q10)a) List and explain various value added services in mobile communication system. [8] b) What are Home Location Registers (HLR) & Visitor Location Registers (VLR)? Explain the significance briefly. [8] Y [3764]-1041 3

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