22334 2023-Winter Electronics Question Paper PDF

23124 22334 3 Hours / 70 Marks Seat No. Instructions : (1) All Questions are compulsory. (2) Illustrate your answers with neat sketches wherever necessary....

23124 22334 3 Hours / 70 Marks Seat No. Instructions : (1) All Questions are compulsory. (2) Illustrate your answers with neat sketches wherever necessary. (3) Figures to the right indicate full marks. (4) Assume suitable data, if necessary. (5) Use of Non-programmable Electronic Pocket Calculator is permissible. (6) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall. Marks 1. Attempt any FIVE of the following : 10 (a) Write IF values of (i) FM radio receiver (ii) MW band AM. (b) Write Carson’s rule to calculate bandwidth of FM wave. (c) Define virtual height with respect to wave propagation. (d) Define modulation index of FM wave. (e) Define radiation pattern and antenna resistance. (f) Define the term signal to noise ratio. (g) Classify types of noise. 2. Attempt any THREE of the following : 12 (a) Draw the block diagram of electronic communication system & describe function of each block. (b) Define the term AGC with respect to AM receiver. State its need. (c) Explain concept of Fading. State reasons of Fading. (d) Define modulation. State the need of modulation for effective communication. [1 of 2] P.T.O. 22334 [2 of 2] 3. Attempt any THREE of the following : 12 (a) With the help of sketch explain simplex & duplex system. (b) Compare ground wave and sky wave propagation (any 4 points). (c) Draw block diagram of PLL as FM demodulator and describe function of each block. (d) Draw radiation pattern for resonant dipole (i) L = /2 (ii) L =  (iii) L = 3 /2 (iv) L = 3 4. Attempt any THREE of the following : 12 (a) A 400 watt carrier is modulated to a depth of 75%. Calculate the total power in modulated wave. Calculate total power if same carrier is modulated to 50%. (b) Draw construction of Yagi-Uda antenna. Draw its radiation pattern. State it’s application. (c) Draw and explain block diagram of AM superheterodyne radio receiver. (d) Compare amplitude modulation and frequency modulation (any 4 points). (e) State frequency ranges of the following : (i) Audio frequency (ii) IR frequency (iii) High frequency (iv) Ultra high frequency 5. Attempt any TWO of the following : 12 (a) Define frequency modulation with the help of suitable waveforms. Compare narrow band FM with wide band FM. (b) Draw block diagram and describe working of Armstrong method to generate FM signal. (c) Explain with sketch the duct propagation. Give its applications. 6. Attempt any TWO of the following : 12 (a) Define modulation index of AM wave. Explain effect of modulation index on AM wave with waveforms. (b) Explain sky wave propagation with neat diagram. (c) (i) Define resonant and non-resonant antenna. (ii) Draw folded dipole antenna and explain with radiation pattern. _______________