III B.Tech II Semester Supplementary Examinations, April/May 2005 COMMUNICATION ENGINEERING (Electronics & Instrumentation Engineering) Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) Explain the Costas loop with the block diagram. (b) Explain the ring modulator for generation ofDSB-SC. 2. (a) Explain clearly envelop detector one method of demodulation of AM wave. (b) A certain transmitter radiates 9Kwwith the carrier unmodulated and 10.125 KW when the carrier is sinusoidally modulated. Calculate the modulation index and percent of modulation. If another sine wave, corresponding to 40 3. (a) Explain the operation of radio transmitter using lower level modulation system (b) What is master oscillator? What are the precautions to be taken in designing of master oscillator to reduce frequency drift. 4. (a) Explain the necessity for AGC in a radio communication. (b) Discuss the consideration that governs the choice of IF in a receiver. (c) Explain the operation of superheterodyne receiver. 5. (a) Differentiate between simple, delayed and amplified AGC and explain their action with the help of simple circuits blocks. (b) Discuss briefly similarities and differences between FM and AM receivers. (c) Write in detail about the limiter used in FM receiver. 6. (a) Discuss the basic problems involved in the design of digital multiplexer. (b) Draw the functional model of pass band data transmission system and explain. 7. What is the main draw back of delta modulation and explain how it is eliminated in Adaptive delta modulation with the help of block diagram and waveforms. 8. (a) Find the expression for noise figure of cascaded amplifier stages. (b) An antenna with temperature of 300K is fed into a receiver with total gain of 80db. Te=1500 K and a bandwidth of 3 MHz i. Find the available noise power at the output of the receiver. ii. Find the necessary signal at antenna terminus also such that SNR is 50 db. ?????
NR321001 III B.Tech II Semester Supplementary Examinations, April ...
(b) Discuss briefly similarities and differences between FM and AM receivers. (c) Write in detail about the limiter used in FM receiver. 6. (a) Discuss the basic ...
3.a) Define a page fault. Explain various steps required to bring a desired page? b) Describe the process of segmentation? 4.a) What are the desirable ...
(b) Discuss and analyze about all the allocation strategies in run-time storage environment . 6. ... (a) Define Address Descriptor and Register Descriptor. (b) Why ...
b) Realize hybrid redundancy with triple modular redundancy core. 4.a) With an example explain the practical fault tolerant system? b) How do you enhance the ...
b) Derive an expression for the heat loss per square metre of the surface area for a · furnace wall when the thermal conductivity varies with temperature ...
With a brief note on decision functions, explain in detail about linear decision · functions. 2.a) Write a short note on cluster analysis. b) Explain a cluster-seeking ...
LINEAR DIGITAL I.C. APPLICATIONS. ( Common to Electronics ... (a) Explain the operation of Monostable multivibrator using 555 timer. Derive the expression of ...
Calculate the internal shear flow for the multcell tube system subjected to a torsion of 10,000 N-cm, for 1 mm thick section ... BM of 120 N-m. The trace of the plane of loading is inclined at 450 to the V-V axis of the section. Locate the neutral ax
7. a) What is creep? Explain the effect of temperature and load on creep curves. b) Explain the various atomic mechanisms involved in deformation at high.
Inner radius Ra = 0.15m, outer radius Rb = 0.45m, Magnetic flux density. B0 = 1.2mW b/m2 i. Determine the Hull cut off voltage ii. Determine the cut off magnetic ...
0 (s)Q0(s), with P0(s) and Q0(s) rel- atively left prime and P0(s) row proper. Find the minimal realization. Determine the values of the controllability index and ...
(a) Why steel scrap is added in cupola and to what extent it can be accommodated in the cupola charge. (b) Enumerate the advantages of hot blast cupola over ...
(b) Pixel connectivity. (c) Distance measure. (d) Equivalence of pixels. 6. (a) Write a note on the following: i. image subtraction ii. image averaging. (b) Show that ...
(b) Distinguish between deterministic test pattern generation and probabilistic ... circuit by inserting addition control logic to the following function, obtain the.
(a) Apply the Bresenham's algorithm to turn up pixels along the line segment determined by points (5,7) and (12,11). (b) Give parametric equation of a line ...
error in the reading due to loading effect. 2. (a) Explain in detail the measurement of power using electrodynamometer. (b) Write short notes on watt-hour meter.